From 7e0783f47df3ea815f5edb67930498eb3a449cf8 Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Thu, 30 Oct 2025 07:54:24 +0100
Subject: [PATCH 1/2] alloc access tracking: print accessed range

---
 src/tools/miri/src/diagnostics.rs                  | 12 ++++++------
 src/tools/miri/src/machine.rs                      | 14 ++++++++++----
 .../miri/tests/pass/alloc-access-tracking.stderr   |  8 ++++----
 3 files changed, 20 insertions(+), 14 deletions(-)

diff --git a/src/tools/miri/src/diagnostics.rs b/src/tools/miri/src/diagnostics.rs
index 0e756d89a2dc..fdbbf9a07698 100644
--- a/src/tools/miri/src/diagnostics.rs
+++ b/src/tools/miri/src/diagnostics.rs
@@ -128,7 +128,7 @@ pub enum NonHaltingDiagnostic {
     PoppedPointerTag(Item, String),
     TrackingAlloc(AllocId, Size, Align),
     FreedAlloc(AllocId),
-    AccessedAlloc(AllocId, AccessKind),
+    AccessedAlloc(AllocId, AllocRange, AccessKind),
     RejectedIsolatedOp(String),
     ProgressReport {
         block_count: u64, // how many basic blocks have been run so far
@@ -673,15 +673,15 @@ impl<'tcx> MiriMachine<'tcx> {
                     "created tag {tag:?} with {perm} at {alloc_id:?}{range:?} derived from {orig_tag:?}"
                 ),
             PoppedPointerTag(item, cause) => format!("popped tracked tag for item {item:?}{cause}"),
-            TrackingAlloc(AllocId(id), size, align) =>
+            TrackingAlloc(id, size, align) =>
                 format!(
-                    "now tracking allocation of {size} bytes (alignment {align} bytes) with id {id}",
+                    "now tracking allocation {id:?} of {size} bytes (alignment {align} bytes)",
                     size = size.bytes(),
                     align = align.bytes(),
                 ),
-            AccessedAlloc(AllocId(id), access_kind) =>
-                format!("{access_kind} to allocation with id {id}"),
-            FreedAlloc(AllocId(id)) => format!("freed allocation with id {id}"),
+            AccessedAlloc(id, range, access_kind) =>
+                format!("{access_kind} at {id:?}[{}..{}]", range.start.bytes(), range.end().bytes()),
+            FreedAlloc(id) => format!("freed allocation {id:?}"),
             RejectedIsolatedOp(op) => format!("{op} was made to return an error due to isolation"),
             ProgressReport { .. } =>
                 format!("progress report: current operation being executed is here"),
diff --git a/src/tools/miri/src/machine.rs b/src/tools/miri/src/machine.rs
index 4072744d175b..9c6eafbd7418 100644
--- a/src/tools/miri/src/machine.rs
+++ b/src/tools/miri/src/machine.rs
@@ -1523,8 +1523,11 @@ impl<'tcx> Machine<'tcx> for MiriMachine<'tcx> {
         range: AllocRange,
     ) -> InterpResult<'tcx> {
         if machine.track_alloc_accesses && machine.tracked_alloc_ids.contains(&alloc_id) {
-            machine
-                .emit_diagnostic(NonHaltingDiagnostic::AccessedAlloc(alloc_id, AccessKind::Read));
+            machine.emit_diagnostic(NonHaltingDiagnostic::AccessedAlloc(
+                alloc_id,
+                range,
+                AccessKind::Read,
+            ));
         }
         // The order of checks is deliberate, to prefer reporting a data race over a borrow tracker error.
         match &machine.data_race {
@@ -1559,8 +1562,11 @@ impl<'tcx> Machine<'tcx> for MiriMachine<'tcx> {
         range: AllocRange,
     ) -> InterpResult<'tcx> {
         if machine.track_alloc_accesses && machine.tracked_alloc_ids.contains(&alloc_id) {
-            machine
-                .emit_diagnostic(NonHaltingDiagnostic::AccessedAlloc(alloc_id, AccessKind::Write));
+            machine.emit_diagnostic(NonHaltingDiagnostic::AccessedAlloc(
+                alloc_id,
+                range,
+                AccessKind::Write,
+            ));
         }
         match &machine.data_race {
             GlobalDataRaceHandler::None => {}
diff --git a/src/tools/miri/tests/pass/alloc-access-tracking.stderr b/src/tools/miri/tests/pass/alloc-access-tracking.stderr
index 3b4dc8f5ea99..cc0cf1f277d5 100644
--- a/src/tools/miri/tests/pass/alloc-access-tracking.stderr
+++ b/src/tools/miri/tests/pass/alloc-access-tracking.stderr
@@ -1,4 +1,4 @@
-note: now tracking allocation of 123 bytes (alignment ALIGN bytes) with id $ALLOC
+note: now tracking allocation ALLOC of 123 bytes (alignment ALIGN bytes)
   --> tests/pass/alloc-access-tracking.rs:LL:CC
    |
 LL |         utils::miri_track_alloc(ptr);
@@ -7,7 +7,7 @@ LL |         utils::miri_track_alloc(ptr);
    = note: BACKTRACE:
    = note: inside `main` at tests/pass/alloc-access-tracking.rs:LL:CC
 
-note: write access to allocation with id $ALLOC
+note: write access at ALLOC[0..1]
   --> tests/pass/alloc-access-tracking.rs:LL:CC
    |
 LL |         *ptr = 42; // Crucially, only a write is printed here, no read!
@@ -16,7 +16,7 @@ LL |         *ptr = 42; // Crucially, only a write is printed here, no read!
    = note: BACKTRACE:
    = note: inside `main` at tests/pass/alloc-access-tracking.rs:LL:CC
 
-note: read access to allocation with id $ALLOC
+note: read access at ALLOC[0..1]
   --> tests/pass/alloc-access-tracking.rs:LL:CC
    |
 LL |         assert_eq!(*ptr, 42);
@@ -26,7 +26,7 @@ LL |         assert_eq!(*ptr, 42);
    = note: inside `main` at RUSTLIB/core/src/macros/mod.rs:LL:CC
    = note: this note originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
 
-note: freed allocation with id $ALLOC
+note: freed allocation ALLOC
   --> RUSTLIB/alloc/src/boxed.rs:LL:CC
    |
 LL |                 self.1.deallocate(From::from(ptr.cast()), layout);

From 04eacd0e00dadcb3c7aecc83aaa4ecf18525fb5a Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Thu, 30 Oct 2025 07:56:56 +0100
Subject: [PATCH 2/2] document -Zmiri-backtrace; dont print backtrace when
 there's only one frame

---
 src/tools/miri/README.md                      |  3 ++
 src/tools/miri/src/diagnostics.rs             | 46 ++++++++++---------
 ...ple_os_unfair_lock_assert_not_owner.stderr |  3 --
 .../apple_os_unfair_lock_assert_owner.stderr  |  3 --
 .../apple_os_unfair_lock_move_deadlock.stderr |  3 --
 .../apple_os_unfair_lock_reentrant.stderr     |  3 --
 .../apple_os_unfair_lock_unowned.stderr       |  3 --
 .../libc_pthread_cond_double_destroy.stderr   |  2 -
 ...ibc_pthread_condattr_double_destroy.stderr |  2 -
 .../libc_pthread_create_too_few_args.stderr   |  1 -
 .../libc_pthread_create_too_many_args.stderr  |  1 -
 .../libc_pthread_join_detached.stderr         |  2 -
 .../libc_pthread_join_joined.stderr           |  2 -
 .../concurrency/libc_pthread_join_main.stderr |  2 -
 .../libc_pthread_join_multiple.stderr         |  2 -
 .../concurrency/libc_pthread_join_self.stderr |  2 -
 .../libc_pthread_mutex_NULL_reentrant.stderr  |  2 -
 .../libc_pthread_mutex_deadlock.stderr        |  3 --
 ...ibc_pthread_mutex_default_reentrant.stderr |  2 -
 .../libc_pthread_mutex_destroy_locked.stderr  |  2 -
 .../libc_pthread_mutex_double_destroy.stderr  |  2 -
 ...libc_pthread_mutex_normal_reentrant.stderr |  3 --
 ...thread_mutex_normal_unlock_unlocked.stderr |  2 -
 ..._pthread_mutex_staticinit_reentrant.stderr |  2 -
 .../libc_pthread_mutex_wrong_owner.stderr     |  2 -
 ...bc_pthread_mutexattr_double_destroy.stderr |  2 -
 ..._pthread_rwlock_destroy_read_locked.stderr |  2 -
 ...pthread_rwlock_destroy_write_locked.stderr |  2 -
 .../libc_pthread_rwlock_double_destroy.stderr |  2 -
 ...k_read_write_deadlock_single_thread.stderr |  3 --
 ...ibc_pthread_rwlock_read_wrong_owner.stderr |  2 -
 ...libc_pthread_rwlock_unlock_unlocked.stderr |  2 -
 ..._pthread_rwlock_write_read_deadlock.stderr |  3 --
 ...k_write_read_deadlock_single_thread.stderr |  3 --
 ...pthread_rwlock_write_write_deadlock.stderr |  3 --
 ..._write_write_deadlock_single_thread.stderr |  3 --
 ...bc_pthread_rwlock_write_wrong_owner.stderr |  2 -
 .../libx_pthread_rwlock_moved.stderr          |  2 -
 .../concurrency/windows_join_main.stderr      |  2 -
 .../concurrency/windows_join_self.stderr      |  3 --
 .../concurrency/windows_thread_invalid.stderr |  3 --
 .../miri/tests/fail-dep/libc/affinity.stderr  |  2 -
 .../libc/aligned_alloc_size_zero_leak.stderr  |  3 --
 .../libc/env-set_var-data-race.stderr         |  2 -
 .../libc/eventfd_block_read_twice.stderr      |  6 +--
 .../libc/eventfd_block_write_twice.stderr     |  6 +--
 .../libc/fcntl_fsetfl_while_blocking.stderr   |  4 --
 .../fail-dep/libc/fs/close_stdout.stderr      |  2 -
 .../fail-dep/libc/fs/read_from_stdout.stderr  |  2 -
 .../fail-dep/libc/fs/write_to_stdin.stderr    |  2 -
 .../fail-dep/libc/libc-epoll-data-race.stderr |  2 -
 .../libc-read-and-uninit-premature-eof.stderr |  2 -
 .../libc/libc_epoll_block_two_thread.stderr   |  6 +--
 .../libc/libc_epoll_unsupported_fd.stderr     |  2 -
 .../libc/malloc_zero_double_free.stderr       |  2 -
 .../libc/malloc_zero_memory_leak.stderr       |  3 --
 .../tests/fail-dep/libc/memchr_null.stderr    |  2 -
 .../tests/fail-dep/libc/memcmp_null.stderr    |  2 -
 .../tests/fail-dep/libc/memcmp_zero.stderr    |  2 -
 .../tests/fail-dep/libc/memcpy_zero.stderr    |  2 -
 .../tests/fail-dep/libc/memrchr_null.stderr   |  2 -
 .../tests/fail-dep/libc/memset_null.stderr    |  2 -
 .../fail-dep/libc/mmap_invalid_dealloc.stderr |  2 -
 .../libc/mmap_use_after_munmap.stderr         |  2 -
 .../tests/fail-dep/libc/munmap_partial.stderr |  2 -
 ...osix_memalign_size_zero_double_free.stderr |  2 -
 .../libc/posix_memalign_size_zero_leak.stderr |  3 --
 .../tests/fail-dep/libc/realloc-zero.stderr   |  2 -
 .../socketpair-close-while-blocked.stderr     |  4 --
 .../fail-dep/libc/socketpair-data-race.stderr |  2 -
 .../libc/socketpair_block_read_twice.stderr   |  6 +--
 .../libc/socketpair_block_write_twice.stderr  |  6 +--
 .../unsupported_incomplete_function.stderr    |  2 -
 .../alloc/deallocate-bad-alignment.stderr     |  2 -
 .../fail/alloc/deallocate-bad-size.stderr     |  2 -
 .../tests/fail/alloc/deallocate-twice.stderr  |  2 -
 .../fail/alloc/no_global_allocator.stderr     |  2 -
 .../fail/alloc/reallocate-bad-size.stderr     |  2 -
 .../fail/alloc/reallocate-change-alloc.stderr |  2 -
 .../fail/alloc/reallocate-dangling.stderr     |  2 -
 .../miri/tests/fail/alloc/too_large.stderr    |  2 -
 .../alloc/unsupported_big_alignment.stderr    |  2 -
 ...unsupported_non_power_two_alignment.stderr |  2 -
 .../alias_through_mutation.stack.stderr       |  2 -
 .../alias_through_mutation.tree.stderr        |  2 -
 .../buggy_as_mut_slice.stack.stderr           |  2 -
 .../buggy_as_mut_slice.tree.stderr            |  2 -
 .../buggy_split_at_mut.tree.stderr            |  2 -
 .../both_borrows/illegal_write1.stack.stderr  |  2 -
 .../both_borrows/illegal_write1.tree.stderr   |  2 -
 .../both_borrows/illegal_write5.stack.stderr  |  2 -
 .../both_borrows/illegal_write5.tree.stderr   |  2 -
 .../load_invalid_shr.stack.stderr             |  2 -
 .../both_borrows/load_invalid_shr.tree.stderr |  2 -
 .../mut_exclusive_violation2.stack.stderr     |  2 -
 .../mut_exclusive_violation2.tree.stderr      |  2 -
 .../both_borrows/outdated_local.stack.stderr  |  2 -
 .../both_borrows/outdated_local.tree.stderr   |  2 -
 .../pass_invalid_shr.stack.stderr             |  2 -
 .../both_borrows/pass_invalid_shr.tree.stderr |  2 -
 .../pass_invalid_shr_option.stack.stderr      |  2 -
 .../pass_invalid_shr_option.tree.stderr       |  2 -
 .../pass_invalid_shr_tuple.stack.stderr       |  2 -
 .../pass_invalid_shr_tuple.tree.stderr        |  2 -
 .../shr_frozen_violation2.stack.stderr        |  2 -
 .../shr_frozen_violation2.tree.stderr         |  2 -
 .../branchless-select-i128-pointer.stderr     |  2 -
 src/tools/miri/tests/fail/breakpoint.stderr   |  3 --
 .../read_only_atomic_cmpxchg.stderr           |  2 -
 .../read_only_atomic_load_acquire.stderr      |  2 -
 .../read_only_atomic_load_large.stderr        |  2 -
 .../dangling_pointer_deref.stderr             |  2 -
 .../dangling_pointer_deref_match_never.stderr |  2 -
 .../dangling_pointer_offset.stderr            |  2 -
 ...ling_pointer_project_underscore_let.stderr |  2 -
 ...ject_underscore_let_type_annotation.stderr |  2 -
 ...ng_pointer_project_underscore_match.stderr |  2 -
 .../dangling_primitive.stderr                 |  2 -
 .../deref-invalid-ptr.stderr                  |  2 -
 .../deref_dangling_box.stderr                 |  2 -
 .../deref_dangling_ref.stderr                 |  2 -
 .../fail/dangling_pointers/dyn_size.stderr    |  2 -
 .../null_pointer_deref.stderr                 |  2 -
 .../null_pointer_write.stderr                 |  2 -
 .../out_of_bounds_project.stderr              |  2 -
 .../out_of_bounds_read.stderr                 |  2 -
 .../out_of_bounds_read_neg_offset.stderr      |  2 -
 .../out_of_bounds_write.stderr                |  2 -
 .../dangling_pointers/stack_temporary.stderr  |  2 -
 .../wild_pointer_deref.stderr                 |  2 -
 .../fail/data_race/alloc_read_race.stderr     |  2 -
 .../fail/data_race/alloc_write_race.stderr    |  2 -
 .../atomic_read_na_write_race1.stderr         |  2 -
 .../atomic_read_na_write_race2.stderr         |  2 -
 .../atomic_write_na_read_race1.stderr         |  2 -
 .../atomic_write_na_read_race2.stderr         |  2 -
 .../atomic_write_na_write_race1.stderr        |  2 -
 .../atomic_write_na_write_race2.stderr        |  2 -
 .../dangling_thread_async_race.stderr         |  2 -
 .../data_race/dangling_thread_race.stderr     |  2 -
 .../fail/data_race/dealloc_read_race1.stderr  |  2 -
 .../fail/data_race/dealloc_read_race2.stderr  |  2 -
 .../data_race/dealloc_read_race_stack.stderr  |  2 -
 .../fail/data_race/dealloc_write_race1.stderr |  2 -
 .../fail/data_race/dealloc_write_race2.stderr |  2 -
 .../data_race/dealloc_write_race_stack.stderr |  2 -
 .../enable_after_join_to_main.stderr          |  2 -
 .../fail/data_race/fence_after_load.stderr    |  2 -
 .../local_variable_alloc_race.stderr          |  2 -
 .../data_race/local_variable_read_race.stderr |  2 -
 .../local_variable_write_race.stderr          |  2 -
 ...ze_read_read_write.match_first_load.stderr |  2 -
 ...e_read_read_write.match_second_load.stderr |  2 -
 .../mixed_size_read_write.read_write.stderr   |  2 -
 .../mixed_size_read_write.write_read.stderr   |  2 -
 .../mixed_size_write_write.fst.stderr         |  2 -
 .../mixed_size_write_write.snd.stderr         |  2 -
 .../fail/data_race/read_write_race.stderr     |  2 -
 .../data_race/read_write_race_stack.stderr    |  2 -
 .../fail/data_race/relax_acquire_race.stderr  |  2 -
 .../fail/data_race/release_seq_race.stderr    |  2 -
 .../release_seq_race_same_thread.stderr       |  2 -
 .../miri/tests/fail/data_race/rmw_race.stderr |  2 -
 .../fail/data_race/stack_pop_race.stderr      |  2 -
 .../fail/data_race/write_write_race.stderr    |  2 -
 .../data_race/write_write_race_stack.stderr   |  2 -
 .../tests/fail/dyn-call-trait-mismatch.stderr |  2 -
 .../fail/dyn-upcast-nop-wrong-trait.stderr    |  2 -
 .../fail/dyn-upcast-trait-mismatch.stderr     |  2 -
 ...m-untagged-variant-invalid-encoding.stderr |  2 -
 .../fail/environ-gets-deallocated.stderr      |  2 -
 .../fail/extern-type-field-offset.stderr      |  4 --
 .../miri/tests/fail/extern_static.stderr      |  2 -
 .../tests/fail/extern_static_in_const.stderr  |  2 -
 .../fail/extern_static_wrong_size.stderr      |  2 -
 .../arg_inplace_locals_alias.stack.stderr     |  2 -
 .../arg_inplace_locals_alias.tree.stderr      |  2 -
 .../arg_inplace_locals_alias_ret.stack.stderr |  2 -
 .../arg_inplace_locals_alias_ret.tree.stderr  |  2 -
 .../arg_inplace_observe_after.stderr          |  2 -
 .../fail/function_calls/check_arg_abi.stderr  |  2 -
 .../check_arg_count_abort.stderr              |  2 -
 .../check_arg_count_too_few_args.stderr       |  2 -
 .../check_arg_count_too_many_args.stderr      |  2 -
 .../function_calls/check_callback_abi.stderr  |  2 -
 .../exported_symbol_abi_mismatch.cache.stderr |  2 -
 ...exported_symbol_abi_mismatch.fn_ptr.stderr |  2 -
 ...ported_symbol_abi_mismatch.no_cache.stderr |  2 -
 .../exported_symbol_bad_unwind1.stderr        |  2 -
 ...ted_symbol_bad_unwind2.extern_block.stderr |  2 -
 .../exported_symbol_clashing.stderr           |  2 -
 .../exported_symbol_shim_clashing.stderr      |  2 -
 .../exported_symbol_wrong_arguments.stderr    |  2 -
 .../exported_symbol_wrong_type.stderr         |  2 -
 .../return_pointer_on_unwind.stderr           |  2 -
 .../fail/function_calls/target_feature.stderr |  2 -
 .../function_calls/target_feature_wasm.stderr |  3 --
 .../abi_mismatch_array_vs_struct.stderr       |  2 -
 .../abi_mismatch_int_vs_float.stderr          |  2 -
 .../abi_mismatch_raw_pointer.stderr           |  2 -
 .../abi_mismatch_repr_C.stderr                |  2 -
 .../abi_mismatch_return_type.stderr           |  2 -
 .../abi_mismatch_simple.stderr                |  2 -
 .../abi_mismatch_too_few_args.stderr          |  2 -
 .../abi_mismatch_too_many_args.stderr         |  2 -
 .../abi_mismatch_vector.stderr                |  2 -
 .../cast_box_int_to_fn_ptr.stderr             |  2 -
 .../cast_int_to_fn_ptr.stderr                 |  2 -
 .../function_pointers/deref_fn_ptr.stderr     |  2 -
 .../function_pointers/execute_memory.stderr   |  2 -
 .../function_pointers/fn_ptr_offset.stderr    |  2 -
 .../fail/intrinsic_fallback_is_spec.stderr    |  2 -
 .../miri/tests/fail/intrinsics/assume.stderr  |  2 -
 .../fail/intrinsics/copy_overflow.stderr      |  2 -
 .../fail/intrinsics/copy_overlapping.stderr   |  2 -
 .../fail/intrinsics/copy_unaligned.stderr     |  2 -
 .../tests/fail/intrinsics/ctlz_nonzero.stderr |  2 -
 .../tests/fail/intrinsics/cttz_nonzero.stderr |  2 -
 .../fail/intrinsics/disjoint_bitor.stderr     |  2 -
 .../tests/fail/intrinsics/div-by-zero.stderr  |  2 -
 .../tests/fail/intrinsics/exact_div1.stderr   |  2 -
 .../tests/fail/intrinsics/exact_div2.stderr   |  2 -
 .../tests/fail/intrinsics/exact_div3.stderr   |  2 -
 .../tests/fail/intrinsics/exact_div4.stderr   |  2 -
 .../fail/intrinsics/fast_math_both.stderr     |  2 -
 .../fail/intrinsics/fast_math_first.stderr    |  2 -
 .../fail/intrinsics/fast_math_result.stderr   |  2 -
 .../fail/intrinsics/fast_math_second.stderr   |  2 -
 .../intrinsics/float_to_int_32_inf1.stderr    |  2 -
 .../intrinsics/float_to_int_32_infneg1.stderr |  2 -
 .../intrinsics/float_to_int_32_nan.stderr     |  2 -
 .../intrinsics/float_to_int_32_nanneg.stderr  |  2 -
 .../intrinsics/float_to_int_32_neg.stderr     |  2 -
 .../float_to_int_32_too_big1.stderr           |  2 -
 .../float_to_int_32_too_big2.stderr           |  2 -
 .../float_to_int_32_too_small1.stderr         |  2 -
 .../intrinsics/float_to_int_64_inf1.stderr    |  2 -
 .../intrinsics/float_to_int_64_infneg1.stderr |  2 -
 .../intrinsics/float_to_int_64_infneg2.stderr |  2 -
 .../intrinsics/float_to_int_64_nan.stderr     |  2 -
 .../intrinsics/float_to_int_64_neg.stderr     |  2 -
 .../float_to_int_64_too_big1.stderr           |  2 -
 .../float_to_int_64_too_big2.stderr           |  2 -
 .../float_to_int_64_too_big3.stderr           |  2 -
 .../float_to_int_64_too_big4.stderr           |  2 -
 .../float_to_int_64_too_big5.stderr           |  2 -
 .../float_to_int_64_too_big6.stderr           |  2 -
 .../float_to_int_64_too_big7.stderr           |  2 -
 .../float_to_int_64_too_small1.stderr         |  2 -
 .../float_to_int_64_too_small2.stderr         |  2 -
 .../float_to_int_64_too_small3.stderr         |  2 -
 .../tests/fail/intrinsics/funnel_shl.stderr   |  2 -
 .../tests/fail/intrinsics/funnel_shr.stderr   |  2 -
 .../intrinsic_target_feature.stderr           |  2 -
 .../ptr_metadata_uninit_slice_len.stderr      |  2 -
 .../ptr_offset_from_different_allocs.stderr   |  2 -
 .../ptr_offset_from_different_ints.stderr     |  2 -
 .../intrinsics/ptr_offset_from_oob.stderr     |  2 -
 .../ptr_offset_from_unsigned_neg.stderr       |  2 -
 .../intrinsics/ptr_offset_int_plus_int.stderr |  2 -
 .../intrinsics/ptr_offset_int_plus_ptr.stderr |  2 -
 .../ptr_offset_out_of_bounds.stderr           |  2 -
 .../ptr_offset_out_of_bounds_neg.stderr       |  2 -
 .../ptr_offset_out_of_bounds_neg2.stderr      |  2 -
 .../intrinsics/ptr_offset_overflow.stderr     |  2 -
 .../ptr_offset_unsigned_overflow.stderr       |  2 -
 .../tests/fail/intrinsics/rem-by-zero.stderr  |  2 -
 .../fail/intrinsics/simd-div-by-zero.stderr   |  2 -
 .../fail/intrinsics/simd-div-overflow.stderr  |  2 -
 .../tests/fail/intrinsics/simd-extract.stderr |  2 -
 .../fail/intrinsics/simd-float-to-int.stderr  |  2 -
 .../tests/fail/intrinsics/simd-gather.stderr  |  2 -
 .../simd-reduce-invalid-bool.stderr           |  2 -
 .../fail/intrinsics/simd-rem-by-zero.stderr   |  2 -
 .../tests/fail/intrinsics/simd-scatter.stderr |  2 -
 .../simd-select-invalid-bool.stderr           |  2 -
 .../fail/intrinsics/simd-shl-too-far.stderr   |  2 -
 .../fail/intrinsics/simd-shr-too-far.stderr   |  2 -
 .../fail/intrinsics/typed-swap-overlap.stderr |  2 -
 .../fail/intrinsics/unchecked_add1.stderr     |  2 -
 .../fail/intrinsics/unchecked_add2.stderr     |  2 -
 .../fail/intrinsics/unchecked_div1.stderr     |  2 -
 .../fail/intrinsics/unchecked_mul1.stderr     |  2 -
 .../fail/intrinsics/unchecked_mul2.stderr     |  2 -
 .../fail/intrinsics/unchecked_shl.stderr      |  2 -
 .../fail/intrinsics/unchecked_shl2.stderr     |  2 -
 .../fail/intrinsics/unchecked_shr.stderr      |  2 -
 .../fail/intrinsics/unchecked_sub1.stderr     |  2 -
 .../fail/intrinsics/unchecked_sub2.stderr     |  2 -
 .../intrinsics/uninit_uninhabited_type.stderr |  2 -
 .../intrinsics/write_bytes_overflow.stderr    |  2 -
 .../tests/fail/intrinsics/zero_fn_ptr.stderr  |  2 -
 ...ce-symbolic-alignment-extern-static.stderr |  2 -
 src/tools/miri/tests/fail/memleak.stderr      |  3 --
 .../tests/fail/modifying_constants.stderr     |  2 -
 .../miri/tests/fail/never_match_never.stderr  |  2 -
 .../miri/tests/fail/never_say_never.stderr    |  2 -
 .../tests/fail/never_transmute_humans.stderr  |  2 -
 .../overlapping_assignment_aggregate.stderr   |  2 -
 .../fail/panic/unwind_panic_abort.stderr      |  2 -
 .../int_copy_looses_provenance0.stderr        |  2 -
 .../int_copy_looses_provenance1.stderr        |  2 -
 .../int_copy_looses_provenance2.stderr        |  2 -
 .../int_copy_looses_provenance3.stderr        |  2 -
 .../tests/fail/provenance/mix-ptrs1.stderr    |  2 -
 .../tests/fail/provenance/mix-ptrs2.stderr    |  2 -
 .../pointer_partial_overwrite.stderr          |  2 -
 .../ptr_copy_loses_partial_provenance0.stderr |  2 -
 .../ptr_copy_loses_partial_provenance1.stderr |  2 -
 .../fail/provenance/ptr_int_unexposed.stderr  |  2 -
 .../tests/fail/provenance/ptr_invalid.stderr  |  2 -
 .../fail/provenance/ptr_invalid_offset.stderr |  2 -
 .../provenance/strict_provenance_cast.stderr  |  2 -
 src/tools/miri/tests/fail/rc_as_ptr.stderr    |  2 -
 .../fail/read_from_trivial_switch.stderr      |  2 -
 .../tests/fail/reading_half_a_pointer.stderr  |  2 -
 .../shims/backtrace/bad-backtrace-decl.stderr |  2 -
 .../backtrace/bad-backtrace-flags.stderr      |  2 -
 .../shims/backtrace/bad-backtrace-ptr.stderr  |  2 -
 .../bad-backtrace-resolve-flags.stderr        |  2 -
 .../bad-backtrace-resolve-names-flags.stderr  |  2 -
 .../backtrace/bad-backtrace-size-flags.stderr |  2 -
 .../fail/shims/ctor_wrong_ret_type.stderr     |  1 -
 .../fail/shims/input_arg_mismatch.stderr      |  2 -
 .../non_vararg_signature_mismatch.stderr      |  2 -
 .../fail/shims/return_type_mismatch.stderr    |  2 -
 .../tests/fail/shims/shim_arg_size.stderr     |  2 -
 .../vararg_caller_signature_mismatch.stderr   |  2 -
 .../fail/shims/wrong_fixed_arg_count.stderr   |  2 -
 .../disable_mut_does_not_merge_srw.stderr     |  2 -
 .../stacked_borrows/exposed_only_ro.stderr    |  2 -
 .../fnentry_invalidation.stderr               |  2 -
 .../fnentry_invalidation2.stderr              |  2 -
 .../stacked_borrows/illegal_dealloc1.stderr   |  2 -
 .../fail/stacked_borrows/illegal_read1.stderr |  2 -
 .../fail/stacked_borrows/illegal_read2.stderr |  2 -
 .../fail/stacked_borrows/illegal_read3.stderr |  2 -
 .../fail/stacked_borrows/illegal_read4.stderr |  2 -
 .../fail/stacked_borrows/illegal_read5.stderr |  2 -
 .../fail/stacked_borrows/illegal_read6.stderr |  2 -
 .../fail/stacked_borrows/illegal_read7.stderr |  2 -
 .../fail/stacked_borrows/illegal_read8.stderr |  2 -
 .../illegal_read_despite_exposed1.stderr      |  2 -
 .../illegal_read_despite_exposed2.stderr      |  2 -
 .../stacked_borrows/illegal_write2.stderr     |  2 -
 .../stacked_borrows/illegal_write3.stderr     |  2 -
 .../stacked_borrows/illegal_write4.stderr     |  2 -
 .../illegal_write_despite_exposed1.stderr     |  2 -
 .../fail/stacked_borrows/interior_mut1.stderr |  2 -
 .../fail/stacked_borrows/interior_mut2.stderr |  2 -
 .../stacked_borrows/load_invalid_mut.stderr   |  2 -
 .../stacked_borrows/pass_invalid_mut.stderr   |  2 -
 .../fail/stacked_borrows/raw_tracking.stderr  |  2 -
 .../retag_data_race_protected_read.stderr     |  2 -
 .../shared_rw_borrows_are_weak1.stderr        |  2 -
 .../shared_rw_borrows_are_weak2.stderr        |  2 -
 .../static_memory_modification.stderr         |  2 -
 .../fail/stacked_borrows/track_caller.stderr  |  2 -
 .../transmute-is-no-escape.stderr             |  2 -
 .../stacked_borrows/unescaped_local.stderr    |  2 -
 .../stacked_borrows/unescaped_static.stderr   |  2 -
 .../fail/stacked_borrows/zst_slice.stderr     |  2 -
 .../fail/static_memory_modification1.stderr   |  2 -
 .../fail/static_memory_modification2.stderr   |  2 -
 .../fail/static_memory_modification3.stderr   |  2 -
 .../tests/fail/storage-live-dead-var.stderr   |  2 -
 .../tests/fail/storage-live-resets-var.stderr |  2 -
 .../tail_calls/signature-mismatch-arg.stderr  |  2 -
 .../tests/fail/tls/tls_static_dealloc.stderr  |  2 -
 .../miri/tests/fail/tls_static_leak.stderr    |  3 --
 .../tree_borrows/alternate-read-write.stderr  |  2 -
 .../tree_borrows/cell-inside-struct.stderr    |  2 -
 .../fail/tree_borrows/error-range.stderr      |  2 -
 .../tree_borrows/fnentry_invalidation.stderr  |  2 -
 .../frozen-lazy-write-to-surrounding.stderr   |  2 -
 .../parent_read_freezes_raw_mut.stderr        |  2 -
 .../tree_borrows/protector-write-lazy.stderr  |  2 -
 .../reservedim_spurious_write.with.stderr     |  2 -
 .../reservedim_spurious_write.without.stderr  |  2 -
 .../tree_borrows/return_invalid_mut.stderr    |  2 -
 .../miri/tests/fail/type-too-large.stderr     |  3 --
 .../fail/unaligned_pointers/alignment.stderr  |  2 -
 .../atomic_unaligned.stderr                   |  2 -
 .../unaligned_pointers/dyn_alignment.stderr   |  2 -
 .../intptrcast_alignment_check.stderr         |  2 -
 ...romise_alignment.call_unaligned_ptr.stderr |  2 -
 ...romise_alignment.read_unaligned_ptr.stderr |  2 -
 .../promise_alignment_zero.stderr             |  2 -
 .../unaligned_pointers/unaligned_ptr1.stderr  |  2 -
 .../unaligned_pointers/unaligned_ptr2.stderr  |  2 -
 .../unaligned_pointers/unaligned_ptr3.stderr  |  2 -
 .../unaligned_pointers/unaligned_ptr4.stderr  |  2 -
 .../unaligned_ptr_zst.stderr                  |  2 -
 .../unaligned_ref_addr_of.stderr              |  2 -
 .../tests/fail/uninit/padding-enum.stderr     |  2 -
 .../tests/fail/uninit/padding-pair.stderr     |  2 -
 .../uninit/padding-struct-in-union.stderr     |  2 -
 .../tests/fail/uninit/padding-struct.stderr   |  2 -
 .../tests/fail/uninit/padding-union.stderr    |  2 -
 .../tests/fail/uninit/padding-wide-ptr.stderr |  2 -
 .../fail/uninit/transmute-pair-uninit.stderr  |  2 -
 .../uninit-after-aggregate-assign.stderr      |  2 -
 .../tests/fail/uninit/uninit_byte_read.stderr |  2 -
 src/tools/miri/tests/fail/unreachable.stderr  |  2 -
 .../fail/unsupported_foreign_function.stderr  |  2 -
 .../box-custom-alloc-dangling-ptr.stderr      |  2 -
 .../box-custom-alloc-invalid-alloc.stderr     |  2 -
 .../cast_fn_ptr_invalid_callee_arg.stderr     |  2 -
 .../cast_fn_ptr_invalid_callee_ret.stderr     |  2 -
 .../cast_fn_ptr_invalid_caller_ret.stderr     |  2 -
 .../tests/fail/validity/dangling_ref1.stderr  |  2 -
 .../tests/fail/validity/dangling_ref2.stderr  |  2 -
 .../tests/fail/validity/dangling_ref3.stderr  |  2 -
 .../dyn-transmute-inner-binder.stderr         |  2 -
 .../tests/fail/validity/invalid_bool.stderr   |  2 -
 .../fail/validity/invalid_bool_op.stderr      |  2 -
 .../fail/validity/invalid_bool_uninit.stderr  |  2 -
 .../tests/fail/validity/invalid_char.stderr   |  2 -
 .../fail/validity/invalid_char_op.stderr      |  2 -
 .../fail/validity/invalid_char_uninit.stderr  |  2 -
 .../fail/validity/invalid_enum_op.stderr      |  2 -
 .../fail/validity/invalid_enum_tag.stderr     |  2 -
 .../fail/validity/invalid_fnptr_null.stderr   |  2 -
 .../fail/validity/invalid_fnptr_uninit.stderr |  2 -
 .../tests/fail/validity/invalid_int_op.stderr |  2 -
 .../fail/validity/invalid_wide_raw.stderr     |  2 -
 .../match_binder_checks_validity1.stderr      |  2 -
 .../match_binder_checks_validity2.stderr      |  2 -
 .../miri/tests/fail/validity/nonzero.stderr   |  2 -
 .../recursive-validity-ref-bool.stderr        |  2 -
 .../fail/validity/ref_to_uninhabited1.stderr  |  2 -
 .../fail/validity/ref_to_uninhabited2.stderr  |  2 -
 .../tests/fail/validity/too-big-slice.stderr  |  2 -
 .../fail/validity/too-big-unsized.stderr      |  2 -
 .../validity/transmute_through_ptr.stderr     |  2 -
 .../tests/fail/validity/uninit_float.stderr   |  2 -
 .../tests/fail/validity/uninit_integer.stderr |  2 -
 .../tests/fail/validity/uninit_raw_ptr.stderr |  2 -
 .../wrong-dyn-trait-assoc-type.stderr         |  2 -
 .../validity/wrong-dyn-trait-generic.stderr   |  2 -
 .../fail/validity/wrong-dyn-trait.stderr      |  2 -
 .../tests/fail/weak_memory/weak_uninit.stderr |  2 -
 .../miri/tests/fail/zst_local_oob.stderr      |  2 -
 .../atomic_ptr_invalid_provenance.make.stderr |  2 -
 .../atomic_ptr_invalid_provenance.send.stderr |  2 -
 .../tests/genmc/fail/loom/buggy_inc.stderr    |  3 --
 .../fail/loom/store_buffering.genmc.stderr    |  3 --
 .../loom/store_buffering.non_genmc.stderr     |  3 --
 .../fail/simple/2w2w_weak.relaxed4.stderr     |  3 --
 .../fail/simple/2w2w_weak.release4.stderr     |  3 --
 .../fail/simple/2w2w_weak.sc3_rel1.stderr     |  3 --
 .../native-lib/fail/function_not_in_so.stderr |  2 -
 .../fail/pass_struct_expose_only_range.stderr |  4 --
 .../native-lib/fail/private_function.stderr   |  2 -
 .../fail/struct_not_extern_c.stderr           |  2 -
 .../native-lib/fail/uninit_struct.stderr      |  2 -
 .../miri/tests/pass/alloc-access-tracking.rs  |  1 -
 .../tests/pass/alloc-access-tracking.stderr   |  8 ----
 .../miri/tests/pass/extern_types.stack.stderr |  2 -
 .../stacked_borrows/issue-miri-2389.stderr    |  2 -
 460 files changed, 32 insertions(+), 991 deletions(-)

diff --git a/src/tools/miri/README.md b/src/tools/miri/README.md
index 1889565cc5b6..0cbfe0e96a3f 100644
--- a/src/tools/miri/README.md
+++ b/src/tools/miri/README.md
@@ -292,6 +292,9 @@ Try running `cargo miri clean`.
 Miri adds its own set of `-Z` flags, which are usually set via the `MIRIFLAGS`
 environment variable. We first document the most relevant and most commonly used flags:
 
+* `-Zmiri-backtrace=<0|1|full>` configures how Miri prints backtraces: `1` is the default,
+  where backtraces are printed in pruned form; `full` prints backtraces without pruning, and `0`
+  disables backtraces entirely.
 * `-Zmiri-deterministic-concurrency` makes Miri's concurrency-related behavior fully deterministic.
   Strictly speaking, Miri is always fully deterministic when isolation is enabled (the default
   mode), but this determinism is achieved by using an RNG with a fixed seed. Seemingly harmless
diff --git a/src/tools/miri/src/diagnostics.rs b/src/tools/miri/src/diagnostics.rs
index fdbbf9a07698..0acdfdd3ffe5 100644
--- a/src/tools/miri/src/diagnostics.rs
+++ b/src/tools/miri/src/diagnostics.rs
@@ -604,28 +604,30 @@ pub fn report_msg<'tcx>(
     }
 
     // Add backtrace
-    let mut backtrace_title = String::from("BACKTRACE");
-    if extra_span {
-        write!(backtrace_title, " (of the first span)").unwrap();
-    }
-    if let Some(thread) = thread {
-        let thread_name = machine.threads.get_thread_display_name(thread);
-        if thread_name != "main" {
-            // Only print thread name if it is not `main`.
-            write!(backtrace_title, " on thread `{thread_name}`").unwrap();
-        };
-    }
-    write!(backtrace_title, ":").unwrap();
-    err.note(backtrace_title);
-    for (idx, frame_info) in stacktrace.iter().enumerate() {
-        let is_local = machine.is_local(frame_info);
-        // No span for non-local frames and the first frame (which is the error site).
-        if is_local && idx > 0 {
-            err.subdiagnostic(frame_info.as_note(machine.tcx));
-        } else {
-            let sm = sess.source_map();
-            let span = sm.span_to_embeddable_string(frame_info.span);
-            err.note(format!("{frame_info} at {span}"));
+    if stacktrace.len() > 1 {
+        let mut backtrace_title = String::from("BACKTRACE");
+        if extra_span {
+            write!(backtrace_title, " (of the first span)").unwrap();
+        }
+        if let Some(thread) = thread {
+            let thread_name = machine.threads.get_thread_display_name(thread);
+            if thread_name != "main" {
+                // Only print thread name if it is not `main`.
+                write!(backtrace_title, " on thread `{thread_name}`").unwrap();
+            };
+        }
+        write!(backtrace_title, ":").unwrap();
+        err.note(backtrace_title);
+        for (idx, frame_info) in stacktrace.iter().enumerate() {
+            let is_local = machine.is_local(frame_info);
+            // No span for non-local frames and the first frame (which is the error site).
+            if is_local && idx > 0 {
+                err.subdiagnostic(frame_info.as_note(machine.tcx));
+            } else {
+                let sm = sess.source_map();
+                let span = sm.span_to_embeddable_string(frame_info.span);
+                err.note(format!("{frame_info} at {span}"));
+            }
         }
     }
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/apple_os_unfair_lock_assert_not_owner.stderr b/src/tools/miri/tests/fail-dep/concurrency/apple_os_unfair_lock_assert_not_owner.stderr
index 27bee79177ed..46d0dd348d73 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/apple_os_unfair_lock_assert_not_owner.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/apple_os_unfair_lock_assert_not_owner.stderr
@@ -3,9 +3,6 @@ error: abnormal termination: called os_unfair_lock_assert_not_owner on an os_unf
    |
 LL |         libc::os_unfair_lock_assert_not_owner(lock.get());
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ abnormal termination occurred here
-   |
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/apple_os_unfair_lock_assert_not_owner.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/apple_os_unfair_lock_assert_owner.stderr b/src/tools/miri/tests/fail-dep/concurrency/apple_os_unfair_lock_assert_owner.stderr
index be53ee61c4cf..7670551f8515 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/apple_os_unfair_lock_assert_owner.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/apple_os_unfair_lock_assert_owner.stderr
@@ -3,9 +3,6 @@ error: abnormal termination: called os_unfair_lock_assert_owner on an os_unfair_
    |
 LL |         libc::os_unfair_lock_assert_owner(lock.get());
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ abnormal termination occurred here
-   |
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/apple_os_unfair_lock_assert_owner.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/apple_os_unfair_lock_move_deadlock.stderr b/src/tools/miri/tests/fail-dep/concurrency/apple_os_unfair_lock_move_deadlock.stderr
index d00da6d6d9f0..8e7364226ecc 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/apple_os_unfair_lock_move_deadlock.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/apple_os_unfair_lock_move_deadlock.stderr
@@ -3,9 +3,6 @@ error: the evaluated program deadlocked
    |
 LL |     unsafe { libc::os_unfair_lock_lock(lock.get()) };
    |                                                  ^ this thread got stuck here
-   |
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/apple_os_unfair_lock_move_deadlock.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/apple_os_unfair_lock_reentrant.stderr b/src/tools/miri/tests/fail-dep/concurrency/apple_os_unfair_lock_reentrant.stderr
index 08696a9b261e..18d54360b065 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/apple_os_unfair_lock_reentrant.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/apple_os_unfair_lock_reentrant.stderr
@@ -3,9 +3,6 @@ error: abnormal termination: attempted to lock an os_unfair_lock that is already
    |
 LL |         libc::os_unfair_lock_lock(lock.get());
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ abnormal termination occurred here
-   |
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/apple_os_unfair_lock_reentrant.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/apple_os_unfair_lock_unowned.stderr b/src/tools/miri/tests/fail-dep/concurrency/apple_os_unfair_lock_unowned.stderr
index aaeb73176bff..c69928b07258 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/apple_os_unfair_lock_unowned.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/apple_os_unfair_lock_unowned.stderr
@@ -3,9 +3,6 @@ error: abnormal termination: attempted to unlock an os_unfair_lock not owned by
    |
 LL |         libc::os_unfair_lock_unlock(lock.get());
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ abnormal termination occurred here
-   |
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/apple_os_unfair_lock_unowned.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_cond_double_destroy.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_cond_double_destroy.stderr
index 6156070cf955..5c5d593ad0eb 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_cond_double_destroy.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_cond_double_destroy.stderr
@@ -6,8 +6,6 @@ LL |         libc::pthread_cond_destroy(cond.as_mut_ptr());
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/libc_pthread_cond_double_destroy.rs:LL:CC
 
 Uninitialized memory occurred at ALLOC[0xX..0xY], in this allocation:
 ALLOC DUMP
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_condattr_double_destroy.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_condattr_double_destroy.stderr
index da64970ff2e2..e34de5af167d 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_condattr_double_destroy.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_condattr_double_destroy.stderr
@@ -6,8 +6,6 @@ LL |         libc::pthread_condattr_destroy(attr.as_mut_ptr());
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/libc_pthread_condattr_double_destroy.rs:LL:CC
 
 Uninitialized memory occurred at ALLOC[0xX..0xY], in this allocation:
 ALLOC DUMP
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_create_too_few_args.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_create_too_few_args.stderr
index 4fa8a430c518..4d5a80c828cd 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_create_too_few_args.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_create_too_few_args.stderr
@@ -4,7 +4,6 @@ error: Undefined Behavior: calling a function with more arguments than it expect
    = note: (no span available)
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE on thread `unnamed-ID`:
 
 error: aborting due to 1 previous error
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_create_too_many_args.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_create_too_many_args.stderr
index d28cba140fbb..1bc79411197c 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_create_too_many_args.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_create_too_many_args.stderr
@@ -4,7 +4,6 @@ error: Undefined Behavior: calling a function with fewer arguments than it requi
    = note: (no span available)
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE on thread `unnamed-ID`:
 
 error: aborting due to 1 previous error
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_join_detached.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_join_detached.stderr
index ffae90db2f96..618584a117e4 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_join_detached.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_join_detached.stderr
@@ -6,8 +6,6 @@ LL |         assert_eq!(libc::pthread_join(native, ptr::null_mut()), 0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/libc_pthread_join_detached.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_join_joined.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_join_joined.stderr
index e22f4dadf3f6..a9f16a96adc2 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_join_joined.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_join_joined.stderr
@@ -6,8 +6,6 @@ LL | ...   assert_eq!(libc::pthread_join(native, ptr::null_mut()), 0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/libc_pthread_join_joined.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_join_main.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_join_main.stderr
index 978a9bdac94d..46c9c5d3d714 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_join_main.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_join_main.stderr
@@ -6,8 +6,6 @@ LL | ...   assert_eq!(libc::pthread_join(thread_id, ptr::null_mut()), 0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE on thread `unnamed-ID`:
-   = note: inside closure at tests/fail-dep/concurrency/libc_pthread_join_main.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_join_multiple.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_join_multiple.stderr
index a73dc20360ac..8a16f82a9307 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_join_multiple.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_join_multiple.stderr
@@ -6,8 +6,6 @@ LL | ...   assert_eq!(libc::pthread_join(native_copy, ptr::null_mut()), 0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE on thread `unnamed-ID`:
-   = note: inside closure at tests/fail-dep/concurrency/libc_pthread_join_multiple.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_join_self.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_join_self.stderr
index e3082935c34e..dec0139bd89a 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_join_self.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_join_self.stderr
@@ -6,8 +6,6 @@ LL |             assert_eq!(libc::pthread_join(native, ptr::null_mut()), 0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE on thread `unnamed-ID`:
-   = note: inside closure at tests/fail-dep/concurrency/libc_pthread_join_self.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_NULL_reentrant.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_NULL_reentrant.stderr
index 961c541c70ab..0e1caafd2956 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_NULL_reentrant.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_NULL_reentrant.stderr
@@ -6,8 +6,6 @@ LL |         libc::pthread_mutex_lock(&mut mutex as *mut _);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/libc_pthread_mutex_NULL_reentrant.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_deadlock.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_deadlock.stderr
index c7c1a769cdaa..582c6f11e360 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_deadlock.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_deadlock.stderr
@@ -3,9 +3,6 @@ error: the evaluated program deadlocked
    |
 LL |             assert_eq!(libc::pthread_mutex_lock(lock_copy.0.get() as *mut _), 0);
    |                                                                            ^ this thread got stuck here
-   |
-   = note: BACKTRACE on thread `unnamed-ID`:
-   = note: inside closure at tests/fail-dep/concurrency/libc_pthread_mutex_deadlock.rs:LL:CC
 
 error: the evaluated program deadlocked
   --> RUSTLIB/std/src/sys/thread/PLATFORM.rs:LL:CC
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_default_reentrant.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_default_reentrant.stderr
index 743bb1af65c1..2bf22210bf32 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_default_reentrant.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_default_reentrant.stderr
@@ -6,8 +6,6 @@ LL |         libc::pthread_mutex_lock(&mut mutex as *mut _);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/libc_pthread_mutex_default_reentrant.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_destroy_locked.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_destroy_locked.stderr
index c4dce0ccc821..e6f58c88b9bb 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_destroy_locked.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_destroy_locked.stderr
@@ -6,8 +6,6 @@ LL |         libc::pthread_mutex_destroy(&mut mutex as *mut _);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/libc_pthread_mutex_destroy_locked.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_double_destroy.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_double_destroy.stderr
index 05db823b252b..36e6a5e44cf5 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_double_destroy.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_double_destroy.stderr
@@ -6,8 +6,6 @@ LL |         libc::pthread_mutex_destroy(mutex.as_mut_ptr());
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/libc_pthread_mutex_double_destroy.rs:LL:CC
 
 Uninitialized memory occurred at ALLOC[0xX..0xY], in this allocation:
 ALLOC DUMP
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_normal_reentrant.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_normal_reentrant.stderr
index fa0c26f987e6..c611d0ff7b00 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_normal_reentrant.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_normal_reentrant.stderr
@@ -3,9 +3,6 @@ error: the evaluated program deadlocked
    |
 LL |         libc::pthread_mutex_lock(&mut mutex as *mut _);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this thread got stuck here
-   |
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/libc_pthread_mutex_normal_reentrant.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_normal_unlock_unlocked.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_normal_unlock_unlocked.stderr
index 7db3885d3d1c..21bead1b9a91 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_normal_unlock_unlocked.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_normal_unlock_unlocked.stderr
@@ -6,8 +6,6 @@ LL |         libc::pthread_mutex_unlock(&mut mutex as *mut _);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/libc_pthread_mutex_normal_unlock_unlocked.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_staticinit_reentrant.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_staticinit_reentrant.stderr
index 677955fe14d1..edbb73c43904 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_staticinit_reentrant.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_staticinit_reentrant.stderr
@@ -6,8 +6,6 @@ LL |         libc::pthread_mutex_lock(&mut mutex as *mut _);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/libc_pthread_mutex_staticinit_reentrant.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_wrong_owner.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_wrong_owner.stderr
index 4a70e16f37f0..c7d858a444cc 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_wrong_owner.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutex_wrong_owner.stderr
@@ -6,8 +6,6 @@ LL | ...   assert_eq!(libc::pthread_mutex_unlock(lock_copy.0.get() as *mut _), 0
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE on thread `unnamed-ID`:
-   = note: inside closure at tests/fail-dep/concurrency/libc_pthread_mutex_wrong_owner.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutexattr_double_destroy.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutexattr_double_destroy.stderr
index ee3883de36ba..73e2585deffc 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutexattr_double_destroy.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_mutexattr_double_destroy.stderr
@@ -6,8 +6,6 @@ LL |         libc::pthread_mutexattr_destroy(attr.as_mut_ptr());
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/libc_pthread_mutexattr_double_destroy.rs:LL:CC
 
 Uninitialized memory occurred at ALLOC[0xX..0xY], in this allocation:
 ALLOC DUMP
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_destroy_read_locked.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_destroy_read_locked.stderr
index 163d54a02f4d..5a1f8913b897 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_destroy_read_locked.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_destroy_read_locked.stderr
@@ -6,8 +6,6 @@ LL |         libc::pthread_rwlock_destroy(rw.get());
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/libc_pthread_rwlock_destroy_read_locked.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_destroy_write_locked.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_destroy_write_locked.stderr
index cc263552024a..6cd47ae1bae2 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_destroy_write_locked.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_destroy_write_locked.stderr
@@ -6,8 +6,6 @@ LL |         libc::pthread_rwlock_destroy(rw.get());
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/libc_pthread_rwlock_destroy_write_locked.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_double_destroy.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_double_destroy.stderr
index 430398dc8fd7..f642481a683c 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_double_destroy.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_double_destroy.stderr
@@ -6,8 +6,6 @@ LL |         libc::pthread_rwlock_destroy(&mut lock);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/libc_pthread_rwlock_double_destroy.rs:LL:CC
 
 Uninitialized memory occurred at ALLOC[0xX..0xY], in this allocation:
 ALLOC DUMP
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_read_write_deadlock_single_thread.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_read_write_deadlock_single_thread.stderr
index c88d08de5556..763a52963a4d 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_read_write_deadlock_single_thread.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_read_write_deadlock_single_thread.stderr
@@ -3,9 +3,6 @@ error: the evaluated program deadlocked
    |
 LL |         libc::pthread_rwlock_wrlock(rw.get());
    |                                             ^ this thread got stuck here
-   |
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/libc_pthread_rwlock_read_write_deadlock_single_thread.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_read_wrong_owner.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_read_wrong_owner.stderr
index 85d8e0e8572e..f1f5c50baf47 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_read_wrong_owner.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_read_wrong_owner.stderr
@@ -6,8 +6,6 @@ LL | ...   assert_eq!(libc::pthread_rwlock_unlock(lock_copy.0.get() as *mut _),
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE on thread `unnamed-ID`:
-   = note: inside closure at tests/fail-dep/concurrency/libc_pthread_rwlock_read_wrong_owner.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_unlock_unlocked.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_unlock_unlocked.stderr
index fc7bd8991e69..2fdc04b72779 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_unlock_unlocked.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_unlock_unlocked.stderr
@@ -6,8 +6,6 @@ LL |         libc::pthread_rwlock_unlock(rw.get());
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/libc_pthread_rwlock_unlock_unlocked.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_write_read_deadlock.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_write_read_deadlock.stderr
index ae8b2b936a71..d8d0ff37e410 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_write_read_deadlock.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_write_read_deadlock.stderr
@@ -3,9 +3,6 @@ error: the evaluated program deadlocked
    |
 LL |             assert_eq!(libc::pthread_rwlock_wrlock(lock_copy.0.get() as *mut _), 0);
    |                                                                               ^ this thread got stuck here
-   |
-   = note: BACKTRACE on thread `unnamed-ID`:
-   = note: inside closure at tests/fail-dep/concurrency/libc_pthread_rwlock_write_read_deadlock.rs:LL:CC
 
 error: the evaluated program deadlocked
   --> RUSTLIB/std/src/sys/thread/PLATFORM.rs:LL:CC
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_write_read_deadlock_single_thread.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_write_read_deadlock_single_thread.stderr
index d7d9a2d3686b..4c8d3fddb97c 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_write_read_deadlock_single_thread.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_write_read_deadlock_single_thread.stderr
@@ -3,9 +3,6 @@ error: the evaluated program deadlocked
    |
 LL |         libc::pthread_rwlock_rdlock(rw.get());
    |                                             ^ this thread got stuck here
-   |
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/libc_pthread_rwlock_write_read_deadlock_single_thread.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_write_write_deadlock.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_write_write_deadlock.stderr
index dfa9a6e25831..c9a4004ebfb3 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_write_write_deadlock.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_write_write_deadlock.stderr
@@ -3,9 +3,6 @@ error: the evaluated program deadlocked
    |
 LL |             assert_eq!(libc::pthread_rwlock_wrlock(lock_copy.0.get() as *mut _), 0);
    |                                                                               ^ this thread got stuck here
-   |
-   = note: BACKTRACE on thread `unnamed-ID`:
-   = note: inside closure at tests/fail-dep/concurrency/libc_pthread_rwlock_write_write_deadlock.rs:LL:CC
 
 error: the evaluated program deadlocked
   --> RUSTLIB/std/src/sys/thread/PLATFORM.rs:LL:CC
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_write_write_deadlock_single_thread.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_write_write_deadlock_single_thread.stderr
index 846f1e73d080..e6a4b2814d83 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_write_write_deadlock_single_thread.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_write_write_deadlock_single_thread.stderr
@@ -3,9 +3,6 @@ error: the evaluated program deadlocked
    |
 LL |         libc::pthread_rwlock_wrlock(rw.get());
    |                                             ^ this thread got stuck here
-   |
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/libc_pthread_rwlock_write_write_deadlock_single_thread.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_write_wrong_owner.stderr b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_write_wrong_owner.stderr
index 8161b0e72eb5..fdf4297c56ae 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_write_wrong_owner.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libc_pthread_rwlock_write_wrong_owner.stderr
@@ -6,8 +6,6 @@ LL | ...   assert_eq!(libc::pthread_rwlock_unlock(lock_copy.0.get() as *mut _),
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE on thread `unnamed-ID`:
-   = note: inside closure at tests/fail-dep/concurrency/libc_pthread_rwlock_write_wrong_owner.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/libx_pthread_rwlock_moved.stderr b/src/tools/miri/tests/fail-dep/concurrency/libx_pthread_rwlock_moved.stderr
index 77d99ed6b0f2..e69da4de99dd 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/libx_pthread_rwlock_moved.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/libx_pthread_rwlock_moved.stderr
@@ -6,8 +6,6 @@ LL |         libc::pthread_rwlock_unlock(&mut rw2 as *mut _);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/libx_pthread_rwlock_moved.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/concurrency/windows_join_main.stderr b/src/tools/miri/tests/fail-dep/concurrency/windows_join_main.stderr
index 3b1181c92fd9..93f800ecca33 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/windows_join_main.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/windows_join_main.stderr
@@ -4,8 +4,6 @@ error: the evaluated program deadlocked
 LL |             assert_eq!(WaitForSingleObject(MAIN_THREAD, INFINITE), WAIT_OBJECT_0);
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this thread got stuck here
    |
-   = note: BACKTRACE on thread `unnamed-ID`:
-   = note: inside closure at RUSTLIB/core/src/macros/mod.rs:LL:CC
    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: the evaluated program deadlocked
diff --git a/src/tools/miri/tests/fail-dep/concurrency/windows_join_self.stderr b/src/tools/miri/tests/fail-dep/concurrency/windows_join_self.stderr
index 6eefa2da1d81..c76da9151b35 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/windows_join_self.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/windows_join_self.stderr
@@ -3,9 +3,6 @@ error: the evaluated program deadlocked
    |
 LL |             assert_eq!(WaitForSingleObject(native, INFINITE), WAIT_OBJECT_0);
    |                                                            ^ this thread got stuck here
-   |
-   = note: BACKTRACE on thread `unnamed-ID`:
-   = note: inside closure at tests/fail-dep/concurrency/windows_join_self.rs:LL:CC
 
 error: the evaluated program deadlocked
   --> RUSTLIB/std/src/sys/thread/PLATFORM.rs:LL:CC
diff --git a/src/tools/miri/tests/fail-dep/concurrency/windows_thread_invalid.stderr b/src/tools/miri/tests/fail-dep/concurrency/windows_thread_invalid.stderr
index 8d4b049b7402..cc950c9cd0f6 100644
--- a/src/tools/miri/tests/fail-dep/concurrency/windows_thread_invalid.stderr
+++ b/src/tools/miri/tests/fail-dep/concurrency/windows_thread_invalid.stderr
@@ -3,9 +3,6 @@ error: abnormal termination: invalid handle 1 passed to GetThreadId
    |
 LL |     let _tid = unsafe { GetThreadId(std::ptr::dangling_mut()) };
    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ abnormal termination occurred here
-   |
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/concurrency/windows_thread_invalid.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/affinity.stderr b/src/tools/miri/tests/fail-dep/libc/affinity.stderr
index e0b3bf16601b..bc13f0698360 100644
--- a/src/tools/miri/tests/fail-dep/libc/affinity.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/affinity.stderr
@@ -11,8 +11,6 @@ help: ALLOC was allocated here:
    |
 LL |     let cpuset: cpu_set_t = unsafe { core::mem::MaybeUninit::zeroed().assume_init() };
    |         ^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail-dep/libc/affinity.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/aligned_alloc_size_zero_leak.stderr b/src/tools/miri/tests/fail-dep/libc/aligned_alloc_size_zero_leak.stderr
index bde7f5b515e3..05b8b1290fd5 100644
--- a/src/tools/miri/tests/fail-dep/libc/aligned_alloc_size_zero_leak.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/aligned_alloc_size_zero_leak.stderr
@@ -3,9 +3,6 @@ error: memory leaked: ALLOC (C heap, size: 0, align: 2), allocated here:
    |
 LL |         aligned_alloc(2, 0);
    |         ^^^^^^^^^^^^^^^^^^^
-   |
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/libc/aligned_alloc_size_zero_leak.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/env-set_var-data-race.stderr b/src/tools/miri/tests/fail-dep/libc/env-set_var-data-race.stderr
index 7db2338cc874..2b10a322b0be 100644
--- a/src/tools/miri/tests/fail-dep/libc/env-set_var-data-race.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/env-set_var-data-race.stderr
@@ -11,8 +11,6 @@ LL |     env::set_var("MY_RUST_VAR", "Ferris");
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail-dep/libc/env-set_var-data-race.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/eventfd_block_read_twice.stderr b/src/tools/miri/tests/fail-dep/libc/eventfd_block_read_twice.stderr
index 6dd6c36ab656..4730045cfe33 100644
--- a/src/tools/miri/tests/fail-dep/libc/eventfd_block_read_twice.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/eventfd_block_read_twice.stderr
@@ -18,22 +18,18 @@ error: the evaluated program deadlocked
    |
    = note: this thread got stuck here
    = note: (no span available)
-   = note: BACKTRACE on thread `unnamed-ID`:
 
 error: the evaluated program deadlocked
   --> tests/fail-dep/libc/eventfd_block_read_twice.rs:LL:CC
    |
 LL |         let res: i64 = unsafe { libc::read(fd, buf.as_mut_ptr().cast(), 8).try_into().unwrap() };
    |                                                                          ^ this thread got stuck here
-   |
-   = note: BACKTRACE on thread `unnamed-ID`:
-   = note: inside closure at tests/fail-dep/libc/eventfd_block_read_twice.rs:LL:CC
 
 error: the evaluated program deadlocked
    |
    = note: this thread got stuck here
    = note: (no span available)
-   = note: BACKTRACE on thread `unnamed-ID`:
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/eventfd_block_write_twice.stderr b/src/tools/miri/tests/fail-dep/libc/eventfd_block_write_twice.stderr
index 3154197b95ed..c0e38df98d48 100644
--- a/src/tools/miri/tests/fail-dep/libc/eventfd_block_write_twice.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/eventfd_block_write_twice.stderr
@@ -18,22 +18,18 @@ error: the evaluated program deadlocked
    |
    = note: this thread got stuck here
    = note: (no span available)
-   = note: BACKTRACE on thread `unnamed-ID`:
 
 error: the evaluated program deadlocked
   --> tests/fail-dep/libc/eventfd_block_write_twice.rs:LL:CC
    |
 LL |             libc::write(fd, sized_8_data.as_ptr() as *const libc::c_void, 8).try_into().unwrap()
    |                                                                            ^ this thread got stuck here
-   |
-   = note: BACKTRACE on thread `unnamed-ID`:
-   = note: inside closure at tests/fail-dep/libc/eventfd_block_write_twice.rs:LL:CC
 
 error: the evaluated program deadlocked
    |
    = note: this thread got stuck here
    = note: (no span available)
-   = note: BACKTRACE on thread `unnamed-ID`:
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/fcntl_fsetfl_while_blocking.stderr b/src/tools/miri/tests/fail-dep/libc/fcntl_fsetfl_while_blocking.stderr
index 41cfe78540aa..e451fdb9d19f 100644
--- a/src/tools/miri/tests/fail-dep/libc/fcntl_fsetfl_while_blocking.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/fcntl_fsetfl_while_blocking.stderr
@@ -2,16 +2,12 @@ error: the evaluated program deadlocked
    |
    = note: this thread got stuck here
    = note: (no span available)
-   = note: BACKTRACE on thread `unnamed-ID`:
 
 error: the evaluated program deadlocked
   --> tests/fail-dep/libc/fcntl_fsetfl_while_blocking.rs:LL:CC
    |
 LL |     let _res = unsafe { libc::read(fds[0], buf.as_mut_ptr().cast(), buf.len() as libc::size_t) };
    |                                                                                              ^ this thread got stuck here
-   |
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/libc/fcntl_fsetfl_while_blocking.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/fs/close_stdout.stderr b/src/tools/miri/tests/fail-dep/libc/fs/close_stdout.stderr
index add7812c450d..84973ac020de 100644
--- a/src/tools/miri/tests/fail-dep/libc/fs/close_stdout.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/fs/close_stdout.stderr
@@ -5,8 +5,6 @@ LL |         libc::close(1);
    |         ^^^^^^^^^^^^^^ unsupported operation occurred here
    |
    = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/libc/fs/close_stdout.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/fs/read_from_stdout.stderr b/src/tools/miri/tests/fail-dep/libc/fs/read_from_stdout.stderr
index 69dc59cd66d2..525df1099f77 100644
--- a/src/tools/miri/tests/fail-dep/libc/fs/read_from_stdout.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/fs/read_from_stdout.stderr
@@ -5,8 +5,6 @@ LL |         libc::read(1, bytes.as_mut_ptr() as *mut libc::c_void, 512);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unsupported operation occurred here
    |
    = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/libc/fs/read_from_stdout.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/fs/write_to_stdin.stderr b/src/tools/miri/tests/fail-dep/libc/fs/write_to_stdin.stderr
index 72f2c0e86622..9aea7fffc465 100644
--- a/src/tools/miri/tests/fail-dep/libc/fs/write_to_stdin.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/fs/write_to_stdin.stderr
@@ -5,8 +5,6 @@ LL |         libc::write(0, bytes.as_ptr() as *const libc::c_void, 5);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unsupported operation occurred here
    |
    = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/libc/fs/write_to_stdin.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/libc-epoll-data-race.stderr b/src/tools/miri/tests/fail-dep/libc/libc-epoll-data-race.stderr
index ae1d6887cb3c..a322de74b510 100644
--- a/src/tools/miri/tests/fail-dep/libc/libc-epoll-data-race.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/libc-epoll-data-race.stderr
@@ -11,8 +11,6 @@ LL |         unsafe { VAL_TWO = 51 };
    |                  ^^^^^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail-dep/libc/libc-epoll-data-race.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/libc-read-and-uninit-premature-eof.stderr b/src/tools/miri/tests/fail-dep/libc/libc-read-and-uninit-premature-eof.stderr
index 83119f087ff2..9d5e119d1c37 100644
--- a/src/tools/miri/tests/fail-dep/libc/libc-read-and-uninit-premature-eof.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/libc-read-and-uninit-premature-eof.stderr
@@ -6,8 +6,6 @@ LL |         buf.assume_init();
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/libc/libc-read-and-uninit-premature-eof.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/libc_epoll_block_two_thread.stderr b/src/tools/miri/tests/fail-dep/libc/libc_epoll_block_two_thread.stderr
index 1af44c107ff8..c3cd04c0b5e6 100644
--- a/src/tools/miri/tests/fail-dep/libc/libc_epoll_block_two_thread.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/libc_epoll_block_two_thread.stderr
@@ -2,7 +2,6 @@ error: the evaluated program deadlocked
    |
    = note: this thread got stuck here
    = note: (no span available)
-   = note: BACKTRACE on thread `unnamed-ID`:
 
 error: the evaluated program deadlocked
   --> RUSTLIB/std/src/sys/thread/PLATFORM.rs:LL:CC
@@ -25,15 +24,12 @@ error: the evaluated program deadlocked
    |
 LL |         check_epoll_wait::<TAG>(epfd, &[(expected_event, expected_value)], -1);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this thread got stuck here
-   |
-   = note: BACKTRACE on thread `unnamed-ID`:
-   = note: inside closure at tests/fail-dep/libc/libc_epoll_block_two_thread.rs:LL:CC
 
 error: the evaluated program deadlocked
    |
    = note: this thread got stuck here
    = note: (no span available)
-   = note: BACKTRACE on thread `unnamed-ID`:
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/libc_epoll_unsupported_fd.stderr b/src/tools/miri/tests/fail-dep/libc/libc_epoll_unsupported_fd.stderr
index 2f02372472e0..321c39937179 100644
--- a/src/tools/miri/tests/fail-dep/libc/libc_epoll_unsupported_fd.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/libc_epoll_unsupported_fd.stderr
@@ -5,8 +5,6 @@ LL |     let res = unsafe { libc::epoll_ctl(epfd0, libc::EPOLL_CTL_ADD, epfd1, &
    |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unsupported operation occurred here
    |
    = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/libc/libc_epoll_unsupported_fd.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/malloc_zero_double_free.stderr b/src/tools/miri/tests/fail-dep/libc/malloc_zero_double_free.stderr
index 4895771acbe4..ea859947cfc9 100644
--- a/src/tools/miri/tests/fail-dep/libc/malloc_zero_double_free.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/malloc_zero_double_free.stderr
@@ -16,8 +16,6 @@ help: ALLOC was deallocated here:
    |
 LL |         libc::free(ptr);
    |         ^^^^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail-dep/libc/malloc_zero_double_free.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/malloc_zero_memory_leak.stderr b/src/tools/miri/tests/fail-dep/libc/malloc_zero_memory_leak.stderr
index 6f3d7fa7a4f2..5da35fa4769d 100644
--- a/src/tools/miri/tests/fail-dep/libc/malloc_zero_memory_leak.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/malloc_zero_memory_leak.stderr
@@ -3,9 +3,6 @@ error: memory leaked: ALLOC (C heap, size: 0, align: 1), allocated here:
    |
 LL |         let _ptr = libc::malloc(0);
    |                    ^^^^^^^^^^^^^^^
-   |
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/libc/malloc_zero_memory_leak.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/memchr_null.stderr b/src/tools/miri/tests/fail-dep/libc/memchr_null.stderr
index e6fd37880331..7dcaf30871e2 100644
--- a/src/tools/miri/tests/fail-dep/libc/memchr_null.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/memchr_null.stderr
@@ -6,8 +6,6 @@ LL |         libc::memchr(ptr::null(), 0, 0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/libc/memchr_null.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/memcmp_null.stderr b/src/tools/miri/tests/fail-dep/libc/memcmp_null.stderr
index a80dec23c3ac..5b212fc51e4e 100644
--- a/src/tools/miri/tests/fail-dep/libc/memcmp_null.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/memcmp_null.stderr
@@ -6,8 +6,6 @@ LL |         libc::memcmp(ptr::null(), ptr::null(), 0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/libc/memcmp_null.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/memcmp_zero.stderr b/src/tools/miri/tests/fail-dep/libc/memcmp_zero.stderr
index 8b114703b33e..286e6e71c4f8 100644
--- a/src/tools/miri/tests/fail-dep/libc/memcmp_zero.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/memcmp_zero.stderr
@@ -6,8 +6,6 @@ LL |         libc::memcmp(ptr.cast(), ptr.cast(), 0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/libc/memcmp_zero.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/memcpy_zero.stderr b/src/tools/miri/tests/fail-dep/libc/memcpy_zero.stderr
index 4c95e47fd226..3c85a0171b53 100644
--- a/src/tools/miri/tests/fail-dep/libc/memcpy_zero.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/memcpy_zero.stderr
@@ -6,8 +6,6 @@ LL |         libc::memcpy(to.cast(), from.cast(), 0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/libc/memcpy_zero.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/memrchr_null.stderr b/src/tools/miri/tests/fail-dep/libc/memrchr_null.stderr
index 1a1626814206..06523d9a5312 100644
--- a/src/tools/miri/tests/fail-dep/libc/memrchr_null.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/memrchr_null.stderr
@@ -6,8 +6,6 @@ LL |         libc::memrchr(ptr::null(), 0, 0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/libc/memrchr_null.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/memset_null.stderr b/src/tools/miri/tests/fail-dep/libc/memset_null.stderr
index fdc8f3a29f94..943e9694d7f7 100644
--- a/src/tools/miri/tests/fail-dep/libc/memset_null.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/memset_null.stderr
@@ -6,8 +6,6 @@ LL |         libc::memset(ptr::null_mut(), 0, 0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/libc/memset_null.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/mmap_invalid_dealloc.stderr b/src/tools/miri/tests/fail-dep/libc/mmap_invalid_dealloc.stderr
index ed9e5ebc29e7..77615c14c62f 100644
--- a/src/tools/miri/tests/fail-dep/libc/mmap_invalid_dealloc.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/mmap_invalid_dealloc.stderr
@@ -6,8 +6,6 @@ LL |         libc::free(ptr);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/libc/mmap_invalid_dealloc.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/mmap_use_after_munmap.stderr b/src/tools/miri/tests/fail-dep/libc/mmap_use_after_munmap.stderr
index f25e74477a52..e8569c9ea218 100644
--- a/src/tools/miri/tests/fail-dep/libc/mmap_use_after_munmap.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/mmap_use_after_munmap.stderr
@@ -23,8 +23,6 @@ help: ALLOC was deallocated here:
    |
 LL |         libc::munmap(ptr, 4096);
    |         ^^^^^^^^^^^^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail-dep/libc/mmap_use_after_munmap.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/munmap_partial.stderr b/src/tools/miri/tests/fail-dep/libc/munmap_partial.stderr
index e1caf4a2dce5..84e648813167 100644
--- a/src/tools/miri/tests/fail-dep/libc/munmap_partial.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/munmap_partial.stderr
@@ -6,8 +6,6 @@ LL |         libc::munmap(ptr, 1);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/libc/munmap_partial.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/posix_memalign_size_zero_double_free.stderr b/src/tools/miri/tests/fail-dep/libc/posix_memalign_size_zero_double_free.stderr
index 9e3b861998a4..4af41429adb8 100644
--- a/src/tools/miri/tests/fail-dep/libc/posix_memalign_size_zero_double_free.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/posix_memalign_size_zero_double_free.stderr
@@ -16,8 +16,6 @@ help: ALLOC was deallocated here:
    |
 LL |         libc::free(ptr);
    |         ^^^^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail-dep/libc/posix_memalign_size_zero_double_free.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/posix_memalign_size_zero_leak.stderr b/src/tools/miri/tests/fail-dep/libc/posix_memalign_size_zero_leak.stderr
index 4546185b13e4..699e54ba0d37 100644
--- a/src/tools/miri/tests/fail-dep/libc/posix_memalign_size_zero_leak.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/posix_memalign_size_zero_leak.stderr
@@ -3,9 +3,6 @@ error: memory leaked: ALLOC (C heap, size: 0, align: 64), allocated here:
    |
 LL |     let _ = unsafe { libc::posix_memalign(&mut ptr, align, size) };
    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/libc/posix_memalign_size_zero_leak.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/realloc-zero.stderr b/src/tools/miri/tests/fail-dep/libc/realloc-zero.stderr
index 459645511467..07fdfd69207d 100644
--- a/src/tools/miri/tests/fail-dep/libc/realloc-zero.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/realloc-zero.stderr
@@ -6,8 +6,6 @@ LL |         let p2 = libc::realloc(p1, 0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/libc/realloc-zero.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/socketpair-close-while-blocked.stderr b/src/tools/miri/tests/fail-dep/libc/socketpair-close-while-blocked.stderr
index b85470225c69..ac2346f6062f 100644
--- a/src/tools/miri/tests/fail-dep/libc/socketpair-close-while-blocked.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/socketpair-close-while-blocked.stderr
@@ -19,15 +19,11 @@ error: the evaluated program deadlocked
    |
 LL |             libc::read(fds[1], buf.as_mut_ptr().cast(), buf.len() as libc::size_t)
    |                                                                                  ^ this thread got stuck here
-   |
-   = note: BACKTRACE on thread `unnamed-ID`:
-   = note: inside closure at tests/fail-dep/libc/socketpair-close-while-blocked.rs:LL:CC
 
 error: the evaluated program deadlocked
    |
    = note: this thread got stuck here
    = note: (no span available)
-   = note: BACKTRACE on thread `unnamed-ID`:
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/socketpair-data-race.stderr b/src/tools/miri/tests/fail-dep/libc/socketpair-data-race.stderr
index 7fb08fe6f102..7cee4b83ba90 100644
--- a/src/tools/miri/tests/fail-dep/libc/socketpair-data-race.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/socketpair-data-race.stderr
@@ -11,8 +11,6 @@ LL |         unsafe { VAL = 1 };
    |                  ^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail-dep/libc/socketpair-data-race.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/socketpair_block_read_twice.stderr b/src/tools/miri/tests/fail-dep/libc/socketpair_block_read_twice.stderr
index bbd2ab1c4d8d..c599432ff13c 100644
--- a/src/tools/miri/tests/fail-dep/libc/socketpair_block_read_twice.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/socketpair_block_read_twice.stderr
@@ -18,22 +18,18 @@ error: the evaluated program deadlocked
    |
    = note: this thread got stuck here
    = note: (no span available)
-   = note: BACKTRACE on thread `unnamed-ID`:
 
 error: the evaluated program deadlocked
   --> tests/fail-dep/libc/socketpair_block_read_twice.rs:LL:CC
    |
 LL |             libc::read(fds[1], buf.as_mut_ptr().cast(), buf.len() as libc::size_t)
    |                                                                                  ^ this thread got stuck here
-   |
-   = note: BACKTRACE on thread `unnamed-ID`:
-   = note: inside closure at tests/fail-dep/libc/socketpair_block_read_twice.rs:LL:CC
 
 error: the evaluated program deadlocked
    |
    = note: this thread got stuck here
    = note: (no span available)
-   = note: BACKTRACE on thread `unnamed-ID`:
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/socketpair_block_write_twice.stderr b/src/tools/miri/tests/fail-dep/libc/socketpair_block_write_twice.stderr
index c3cc20681731..2230d99fc665 100644
--- a/src/tools/miri/tests/fail-dep/libc/socketpair_block_write_twice.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/socketpair_block_write_twice.stderr
@@ -18,22 +18,18 @@ error: the evaluated program deadlocked
    |
    = note: this thread got stuck here
    = note: (no span available)
-   = note: BACKTRACE on thread `unnamed-ID`:
 
 error: the evaluated program deadlocked
   --> tests/fail-dep/libc/socketpair_block_write_twice.rs:LL:CC
    |
 LL |         let res = unsafe { libc::write(fds[0], data.as_ptr() as *const libc::c_void, data.len()) };
    |                                                                                                ^ this thread got stuck here
-   |
-   = note: BACKTRACE on thread `unnamed-ID`:
-   = note: inside closure at tests/fail-dep/libc/socketpair_block_write_twice.rs:LL:CC
 
 error: the evaluated program deadlocked
    |
    = note: this thread got stuck here
    = note: (no span available)
-   = note: BACKTRACE on thread `unnamed-ID`:
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail-dep/libc/unsupported_incomplete_function.stderr b/src/tools/miri/tests/fail-dep/libc/unsupported_incomplete_function.stderr
index 161cb383cf78..f8e8f5b46d38 100644
--- a/src/tools/miri/tests/fail-dep/libc/unsupported_incomplete_function.stderr
+++ b/src/tools/miri/tests/fail-dep/libc/unsupported_incomplete_function.stderr
@@ -5,8 +5,6 @@ LL |         libc::signal(libc::SIGPIPE, libc::SIG_IGN);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unsupported operation occurred here
    |
    = help: this means the program tried to do something Miri does not support; it does not indicate a bug in the program
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail-dep/libc/unsupported_incomplete_function.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/alloc/deallocate-bad-alignment.stderr b/src/tools/miri/tests/fail/alloc/deallocate-bad-alignment.stderr
index 11e1eaa38521..6daed4fdb656 100644
--- a/src/tools/miri/tests/fail/alloc/deallocate-bad-alignment.stderr
+++ b/src/tools/miri/tests/fail/alloc/deallocate-bad-alignment.stderr
@@ -6,8 +6,6 @@ LL |         dealloc(x, Layout::from_size_align_unchecked(1, 2));
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/alloc/deallocate-bad-alignment.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/alloc/deallocate-bad-size.stderr b/src/tools/miri/tests/fail/alloc/deallocate-bad-size.stderr
index 5e0e2f2da44d..840dcc911ce9 100644
--- a/src/tools/miri/tests/fail/alloc/deallocate-bad-size.stderr
+++ b/src/tools/miri/tests/fail/alloc/deallocate-bad-size.stderr
@@ -6,8 +6,6 @@ LL |         dealloc(x, Layout::from_size_align_unchecked(2, 1));
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/alloc/deallocate-bad-size.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/alloc/deallocate-twice.stderr b/src/tools/miri/tests/fail/alloc/deallocate-twice.stderr
index 715fe7b0f601..389c8ca32d18 100644
--- a/src/tools/miri/tests/fail/alloc/deallocate-twice.stderr
+++ b/src/tools/miri/tests/fail/alloc/deallocate-twice.stderr
@@ -16,8 +16,6 @@ help: ALLOC was deallocated here:
    |
 LL |         dealloc(x, Layout::from_size_align_unchecked(1, 1));
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/alloc/deallocate-twice.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/alloc/no_global_allocator.stderr b/src/tools/miri/tests/fail/alloc/no_global_allocator.stderr
index b2b688e0c9eb..75f62654cd46 100644
--- a/src/tools/miri/tests/fail/alloc/no_global_allocator.stderr
+++ b/src/tools/miri/tests/fail/alloc/no_global_allocator.stderr
@@ -5,8 +5,6 @@ LL |         __rust_alloc(1, 1);
    |         ^^^^^^^^^^^^^^^^^^ unsupported operation occurred here
    |
    = help: this means the program tried to do something Miri does not support; it does not indicate a bug in the program
-   = note: BACKTRACE:
-   = note: inside `miri_start` at tests/fail/alloc/no_global_allocator.rs:LL:CC
 
 error: aborting due to 1 previous error
 
diff --git a/src/tools/miri/tests/fail/alloc/reallocate-bad-size.stderr b/src/tools/miri/tests/fail/alloc/reallocate-bad-size.stderr
index 639ed069f08b..870f62e53387 100644
--- a/src/tools/miri/tests/fail/alloc/reallocate-bad-size.stderr
+++ b/src/tools/miri/tests/fail/alloc/reallocate-bad-size.stderr
@@ -6,8 +6,6 @@ LL | ...   let _y = realloc(x, Layout::from_size_align_unchecked(2, 1), 1);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/alloc/reallocate-bad-size.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/alloc/reallocate-change-alloc.stderr b/src/tools/miri/tests/fail/alloc/reallocate-change-alloc.stderr
index 16e6a5b5b090..c4d2835a5466 100644
--- a/src/tools/miri/tests/fail/alloc/reallocate-change-alloc.stderr
+++ b/src/tools/miri/tests/fail/alloc/reallocate-change-alloc.stderr
@@ -16,8 +16,6 @@ help: ALLOC was deallocated here:
    |
 LL |         let _y = realloc(x, Layout::from_size_align_unchecked(1, 1), 1);
    |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/alloc/reallocate-change-alloc.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/alloc/reallocate-dangling.stderr b/src/tools/miri/tests/fail/alloc/reallocate-dangling.stderr
index e30a02ef9d76..8d94dfa1dabc 100644
--- a/src/tools/miri/tests/fail/alloc/reallocate-dangling.stderr
+++ b/src/tools/miri/tests/fail/alloc/reallocate-dangling.stderr
@@ -16,8 +16,6 @@ help: ALLOC was deallocated here:
    |
 LL |         dealloc(x, Layout::from_size_align_unchecked(1, 1));
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/alloc/reallocate-dangling.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/alloc/too_large.stderr b/src/tools/miri/tests/fail/alloc/too_large.stderr
index dcfaeb737a80..14fad06fc06d 100644
--- a/src/tools/miri/tests/fail/alloc/too_large.stderr
+++ b/src/tools/miri/tests/fail/alloc/too_large.stderr
@@ -6,8 +6,6 @@ LL |         __rust_alloc(bytes, 1);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/alloc/too_large.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/alloc/unsupported_big_alignment.stderr b/src/tools/miri/tests/fail/alloc/unsupported_big_alignment.stderr
index 6c7ee17df35d..11d2a855ef71 100644
--- a/src/tools/miri/tests/fail/alloc/unsupported_big_alignment.stderr
+++ b/src/tools/miri/tests/fail/alloc/unsupported_big_alignment.stderr
@@ -5,8 +5,6 @@ LL |         __rust_alloc(1, 1 << 30);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^ unsupported operation occurred here
    |
    = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/alloc/unsupported_big_alignment.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/alloc/unsupported_non_power_two_alignment.stderr b/src/tools/miri/tests/fail/alloc/unsupported_non_power_two_alignment.stderr
index a0f853a42914..827d498e7ec9 100644
--- a/src/tools/miri/tests/fail/alloc/unsupported_non_power_two_alignment.stderr
+++ b/src/tools/miri/tests/fail/alloc/unsupported_non_power_two_alignment.stderr
@@ -6,8 +6,6 @@ LL |         __rust_alloc(1, 3);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/alloc/unsupported_non_power_two_alignment.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/both_borrows/alias_through_mutation.stack.stderr b/src/tools/miri/tests/fail/both_borrows/alias_through_mutation.stack.stderr
index 70301db0fbb5..e0fbe02edc2d 100644
--- a/src/tools/miri/tests/fail/both_borrows/alias_through_mutation.stack.stderr
+++ b/src/tools/miri/tests/fail/both_borrows/alias_through_mutation.stack.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a write access
    |
 LL |     *target = 13;
    |     ^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/both_borrows/alias_through_mutation.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/both_borrows/alias_through_mutation.tree.stderr b/src/tools/miri/tests/fail/both_borrows/alias_through_mutation.tree.stderr
index 95b7e99dedc7..0a24a1ef3982 100644
--- a/src/tools/miri/tests/fail/both_borrows/alias_through_mutation.tree.stderr
+++ b/src/tools/miri/tests/fail/both_borrows/alias_through_mutation.tree.stderr
@@ -18,8 +18,6 @@ help: the accessed tag <TAG> later transitioned to Disabled due to a foreign wri
 LL |     *target = 13;
    |     ^^^^^^^^^^^^
    = help: this transition corresponds to a loss of read permissions
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/both_borrows/alias_through_mutation.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/both_borrows/buggy_as_mut_slice.stack.stderr b/src/tools/miri/tests/fail/both_borrows/buggy_as_mut_slice.stack.stderr
index 2e394297b0c5..b1a61b079b34 100644
--- a/src/tools/miri/tests/fail/both_borrows/buggy_as_mut_slice.stack.stderr
+++ b/src/tools/miri/tests/fail/both_borrows/buggy_as_mut_slice.stack.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0xc] by a Unique retag
    |
 LL |         unsafe { from_raw_parts_mut(self_.as_ptr() as *mut T, self_.len()) }
    |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/both_borrows/buggy_as_mut_slice.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/both_borrows/buggy_as_mut_slice.tree.stderr b/src/tools/miri/tests/fail/both_borrows/buggy_as_mut_slice.tree.stderr
index 6588bc25df13..2537c0f94500 100644
--- a/src/tools/miri/tests/fail/both_borrows/buggy_as_mut_slice.tree.stderr
+++ b/src/tools/miri/tests/fail/both_borrows/buggy_as_mut_slice.tree.stderr
@@ -18,8 +18,6 @@ help: the accessed tag <TAG> later transitioned to Disabled due to a foreign wri
 LL |     v1[1] = 5;
    |     ^^^^^^^^^
    = help: this transition corresponds to a loss of read and write permissions
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/both_borrows/buggy_as_mut_slice.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/both_borrows/buggy_split_at_mut.tree.stderr b/src/tools/miri/tests/fail/both_borrows/buggy_split_at_mut.tree.stderr
index 6ef27515fcd0..45b306e8108e 100644
--- a/src/tools/miri/tests/fail/both_borrows/buggy_split_at_mut.tree.stderr
+++ b/src/tools/miri/tests/fail/both_borrows/buggy_split_at_mut.tree.stderr
@@ -18,8 +18,6 @@ help: the accessed tag <TAG> later transitioned to Disabled due to a foreign wri
 LL |     a[1] = 5;
    |     ^^^^^^^^
    = help: this transition corresponds to a loss of read and write permissions
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/both_borrows/buggy_split_at_mut.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/both_borrows/illegal_write1.stack.stderr b/src/tools/miri/tests/fail/both_borrows/illegal_write1.stack.stderr
index 55046dbbe67c..ec25e1526008 100644
--- a/src/tools/miri/tests/fail/both_borrows/illegal_write1.stack.stderr
+++ b/src/tools/miri/tests/fail/both_borrows/illegal_write1.stack.stderr
@@ -11,8 +11,6 @@ help: <TAG> was created by a SharedReadOnly retag at offsets [0x0..0x4]
    |
 LL |         let x: *mut u32 = xref as *const _ as *mut _;
    |                           ^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/both_borrows/illegal_write1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/both_borrows/illegal_write1.tree.stderr b/src/tools/miri/tests/fail/both_borrows/illegal_write1.tree.stderr
index 4ffc7a75e66d..6522ca9f02fa 100644
--- a/src/tools/miri/tests/fail/both_borrows/illegal_write1.tree.stderr
+++ b/src/tools/miri/tests/fail/both_borrows/illegal_write1.tree.stderr
@@ -12,8 +12,6 @@ help: the accessed tag <TAG> was created here, in the initial state Frozen
    |
 LL |     let xref = &*target;
    |                ^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/both_borrows/illegal_write1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/both_borrows/illegal_write5.stack.stderr b/src/tools/miri/tests/fail/both_borrows/illegal_write5.stack.stderr
index 4e39d9c083b6..01768cc8ae7a 100644
--- a/src/tools/miri/tests/fail/both_borrows/illegal_write5.stack.stderr
+++ b/src/tools/miri/tests/fail/both_borrows/illegal_write5.stack.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a write access
    |
 LL |     unsafe { *xraw = 15 };
    |              ^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/both_borrows/illegal_write5.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/both_borrows/illegal_write5.tree.stderr b/src/tools/miri/tests/fail/both_borrows/illegal_write5.tree.stderr
index fc5b12da70e7..4c2cb7d2f25a 100644
--- a/src/tools/miri/tests/fail/both_borrows/illegal_write5.tree.stderr
+++ b/src/tools/miri/tests/fail/both_borrows/illegal_write5.tree.stderr
@@ -18,8 +18,6 @@ help: the accessed tag <TAG> later transitioned to Disabled due to a foreign wri
 LL |     unsafe { *xraw = 15 };
    |              ^^^^^^^^^^
    = help: this transition corresponds to a loss of read and write permissions
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/both_borrows/illegal_write5.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/both_borrows/load_invalid_shr.stack.stderr b/src/tools/miri/tests/fail/both_borrows/load_invalid_shr.stack.stderr
index e7915d93a263..31fa9767512e 100644
--- a/src/tools/miri/tests/fail/both_borrows/load_invalid_shr.stack.stderr
+++ b/src/tools/miri/tests/fail/both_borrows/load_invalid_shr.stack.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a write access
    |
 LL |     unsafe { *xraw = 42 }; // unfreeze
    |              ^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/both_borrows/load_invalid_shr.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/both_borrows/load_invalid_shr.tree.stderr b/src/tools/miri/tests/fail/both_borrows/load_invalid_shr.tree.stderr
index e4bde2f7aeab..468b5ca6091b 100644
--- a/src/tools/miri/tests/fail/both_borrows/load_invalid_shr.tree.stderr
+++ b/src/tools/miri/tests/fail/both_borrows/load_invalid_shr.tree.stderr
@@ -18,8 +18,6 @@ help: the accessed tag <TAG> later transitioned to Disabled due to a foreign wri
 LL |     unsafe { *xraw = 42 }; // unfreeze
    |              ^^^^^^^^^^
    = help: this transition corresponds to a loss of read permissions
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/both_borrows/load_invalid_shr.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/both_borrows/mut_exclusive_violation2.stack.stderr b/src/tools/miri/tests/fail/both_borrows/mut_exclusive_violation2.stack.stderr
index 21690d6c4c28..7731a30902c4 100644
--- a/src/tools/miri/tests/fail/both_borrows/mut_exclusive_violation2.stack.stderr
+++ b/src/tools/miri/tests/fail/both_borrows/mut_exclusive_violation2.stack.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a Unique retag
    |
 LL |         let raw2 = ptr2.as_mut();
    |                    ^^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/both_borrows/mut_exclusive_violation2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/both_borrows/mut_exclusive_violation2.tree.stderr b/src/tools/miri/tests/fail/both_borrows/mut_exclusive_violation2.tree.stderr
index c1b0821a9fee..d3198a38ba85 100644
--- a/src/tools/miri/tests/fail/both_borrows/mut_exclusive_violation2.tree.stderr
+++ b/src/tools/miri/tests/fail/both_borrows/mut_exclusive_violation2.tree.stderr
@@ -18,8 +18,6 @@ help: the accessed tag <TAG> later transitioned to Disabled due to a foreign wri
 LL |         *raw2 = 2;
    |         ^^^^^^^^^
    = help: this transition corresponds to a loss of read and write permissions
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/both_borrows/mut_exclusive_violation2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/both_borrows/outdated_local.stack.stderr b/src/tools/miri/tests/fail/both_borrows/outdated_local.stack.stderr
index 8c1de1a38f08..b929a9b15998 100644
--- a/src/tools/miri/tests/fail/both_borrows/outdated_local.stack.stderr
+++ b/src/tools/miri/tests/fail/both_borrows/outdated_local.stack.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a write access
    |
 LL |     x = 1; // this invalidates y by reactivating the lowermost uniq borrow for this local
    |     ^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/both_borrows/outdated_local.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/both_borrows/outdated_local.tree.stderr b/src/tools/miri/tests/fail/both_borrows/outdated_local.tree.stderr
index 5310f8b9d099..745ff2f3b6c3 100644
--- a/src/tools/miri/tests/fail/both_borrows/outdated_local.tree.stderr
+++ b/src/tools/miri/tests/fail/both_borrows/outdated_local.tree.stderr
@@ -18,8 +18,6 @@ help: the accessed tag <TAG> later transitioned to Disabled due to a foreign wri
 LL |     x = 1; // this invalidates y by reactivating the lowermost uniq borrow for this local
    |     ^^^^^
    = help: this transition corresponds to a loss of read permissions
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/both_borrows/outdated_local.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr.stack.stderr b/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr.stack.stderr
index 712764d25ee6..3fb56ff9d4a5 100644
--- a/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr.stack.stderr
+++ b/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr.stack.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a write access
    |
 LL |     unsafe { *xraw = 42 }; // unfreeze
    |              ^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/both_borrows/pass_invalid_shr.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr.tree.stderr b/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr.tree.stderr
index 3c813d35031b..789f31159e66 100644
--- a/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr.tree.stderr
+++ b/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr.tree.stderr
@@ -18,8 +18,6 @@ help: the accessed tag <TAG> later transitioned to Disabled due to a foreign wri
 LL |     unsafe { *xraw = 42 }; // unfreeze
    |              ^^^^^^^^^^
    = help: this transition corresponds to a loss of read permissions
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/both_borrows/pass_invalid_shr.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr_option.stack.stderr b/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr_option.stack.stderr
index 5845f6d50778..c5b8de9563c3 100644
--- a/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr_option.stack.stderr
+++ b/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr_option.stack.stderr
@@ -19,8 +19,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a write access
    |
 LL |     unsafe { *xraw = 42 }; // unfreeze
    |              ^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/both_borrows/pass_invalid_shr_option.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr_option.tree.stderr b/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr_option.tree.stderr
index 4747c65ba835..2e672034dd8a 100644
--- a/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr_option.tree.stderr
+++ b/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr_option.tree.stderr
@@ -18,8 +18,6 @@ help: the accessed tag <TAG> later transitioned to Disabled due to a foreign wri
 LL |     unsafe { *xraw = 42 }; // unfreeze
    |              ^^^^^^^^^^
    = help: this transition corresponds to a loss of read permissions
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/both_borrows/pass_invalid_shr_option.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr_tuple.stack.stderr b/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr_tuple.stack.stderr
index 41842daa947b..fd5ca73a7afd 100644
--- a/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr_tuple.stack.stderr
+++ b/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr_tuple.stack.stderr
@@ -19,8 +19,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a write access
    |
 LL |     unsafe { *xraw0 = 42 }; // unfreeze
    |              ^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/both_borrows/pass_invalid_shr_tuple.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr_tuple.tree.stderr b/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr_tuple.tree.stderr
index da011cfd3f74..6d9dce948c15 100644
--- a/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr_tuple.tree.stderr
+++ b/src/tools/miri/tests/fail/both_borrows/pass_invalid_shr_tuple.tree.stderr
@@ -18,8 +18,6 @@ help: the accessed tag <TAG> later transitioned to Disabled due to a foreign wri
 LL |     unsafe { *xraw0 = 42 }; // unfreeze
    |              ^^^^^^^^^^^
    = help: this transition corresponds to a loss of read permissions
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/both_borrows/pass_invalid_shr_tuple.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/both_borrows/shr_frozen_violation2.stack.stderr b/src/tools/miri/tests/fail/both_borrows/shr_frozen_violation2.stack.stderr
index 39a21e60a1b5..5610cd6a7a46 100644
--- a/src/tools/miri/tests/fail/both_borrows/shr_frozen_violation2.stack.stderr
+++ b/src/tools/miri/tests/fail/both_borrows/shr_frozen_violation2.stack.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a write access
    |
 LL |         x = 1;
    |         ^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/both_borrows/shr_frozen_violation2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/both_borrows/shr_frozen_violation2.tree.stderr b/src/tools/miri/tests/fail/both_borrows/shr_frozen_violation2.tree.stderr
index c680c04137bc..29739c571293 100644
--- a/src/tools/miri/tests/fail/both_borrows/shr_frozen_violation2.tree.stderr
+++ b/src/tools/miri/tests/fail/both_borrows/shr_frozen_violation2.tree.stderr
@@ -18,8 +18,6 @@ help: the accessed tag <TAG> later transitioned to Disabled due to a foreign wri
 LL |         x = 1;
    |         ^^^^^
    = help: this transition corresponds to a loss of read permissions
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/both_borrows/shr_frozen_violation2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/branchless-select-i128-pointer.stderr b/src/tools/miri/tests/fail/branchless-select-i128-pointer.stderr
index 3f44ef789e95..abcaf90a1ec3 100644
--- a/src/tools/miri/tests/fail/branchless-select-i128-pointer.stderr
+++ b/src/tools/miri/tests/fail/branchless-select-i128-pointer.stderr
@@ -10,8 +10,6 @@ LL | |             )
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/branchless-select-i128-pointer.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/breakpoint.stderr b/src/tools/miri/tests/fail/breakpoint.stderr
index 1963e9c9ec14..9f3414740d6a 100644
--- a/src/tools/miri/tests/fail/breakpoint.stderr
+++ b/src/tools/miri/tests/fail/breakpoint.stderr
@@ -3,9 +3,6 @@ error: abnormal termination: trace/breakpoint trap
    |
 LL |     core::intrinsics::breakpoint();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ abnormal termination occurred here
-   |
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/breakpoint.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/concurrency/read_only_atomic_cmpxchg.stderr b/src/tools/miri/tests/fail/concurrency/read_only_atomic_cmpxchg.stderr
index 9010033ca70f..dc56a7b3ca02 100644
--- a/src/tools/miri/tests/fail/concurrency/read_only_atomic_cmpxchg.stderr
+++ b/src/tools/miri/tests/fail/concurrency/read_only_atomic_cmpxchg.stderr
@@ -7,8 +7,6 @@ LL |     x.compare_exchange(1, 2, Ordering::Relaxed, Ordering::Relaxed).unwrap_e
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/concurrency/read_only_atomic_cmpxchg.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/concurrency/read_only_atomic_load_acquire.stderr b/src/tools/miri/tests/fail/concurrency/read_only_atomic_load_acquire.stderr
index b9e492f89be7..dde706800259 100644
--- a/src/tools/miri/tests/fail/concurrency/read_only_atomic_load_acquire.stderr
+++ b/src/tools/miri/tests/fail/concurrency/read_only_atomic_load_acquire.stderr
@@ -8,8 +8,6 @@ LL |     x.load(Ordering::Acquire);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/concurrency/read_only_atomic_load_acquire.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/concurrency/read_only_atomic_load_large.stderr b/src/tools/miri/tests/fail/concurrency/read_only_atomic_load_large.stderr
index 1fcc88f87356..f782733761ae 100644
--- a/src/tools/miri/tests/fail/concurrency/read_only_atomic_load_large.stderr
+++ b/src/tools/miri/tests/fail/concurrency/read_only_atomic_load_large.stderr
@@ -8,8 +8,6 @@ LL |     x.load(Ordering::Relaxed);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/concurrency/read_only_atomic_load_large.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_deref.stderr b/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_deref.stderr
index 7ddb5be54251..c34783773e2e 100644
--- a/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_deref.stderr
+++ b/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_deref.stderr
@@ -16,8 +16,6 @@ help: ALLOC was deallocated here:
    |
 LL |     };
    |     ^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/dangling_pointers/dangling_pointer_deref.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_deref_match_never.stderr b/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_deref_match_never.stderr
index 735e90328d7d..24d7df226c0a 100644
--- a/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_deref_match_never.stderr
+++ b/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_deref_match_never.stderr
@@ -6,8 +6,6 @@ LL |         match *p {}
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/dangling_pointers/dangling_pointer_deref_match_never.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_offset.stderr b/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_offset.stderr
index 2b34001ddf3c..99b1cb2da233 100644
--- a/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_offset.stderr
+++ b/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_offset.stderr
@@ -16,8 +16,6 @@ help: ALLOC was deallocated here:
    |
 LL |     };
    |     ^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/dangling_pointers/dangling_pointer_offset.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_project_underscore_let.stderr b/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_project_underscore_let.stderr
index 04ac535448b4..e8dfc7dee062 100644
--- a/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_project_underscore_let.stderr
+++ b/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_project_underscore_let.stderr
@@ -16,8 +16,6 @@ help: ALLOC was deallocated here:
    |
 LL |     };
    |     ^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/dangling_pointers/dangling_pointer_project_underscore_let.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_project_underscore_let_type_annotation.stderr b/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_project_underscore_let_type_annotation.stderr
index cd44f728bf62..842244c0a259 100644
--- a/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_project_underscore_let_type_annotation.stderr
+++ b/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_project_underscore_let_type_annotation.stderr
@@ -16,8 +16,6 @@ help: ALLOC was deallocated here:
    |
 LL |     };
    |     ^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/dangling_pointers/dangling_pointer_project_underscore_let_type_annotation.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_project_underscore_match.stderr b/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_project_underscore_match.stderr
index c49e663fd422..1236c1b54d45 100644
--- a/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_project_underscore_match.stderr
+++ b/src/tools/miri/tests/fail/dangling_pointers/dangling_pointer_project_underscore_match.stderr
@@ -16,8 +16,6 @@ help: ALLOC was deallocated here:
    |
 LL |     };
    |     ^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/dangling_pointers/dangling_pointer_project_underscore_match.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/dangling_pointers/dangling_primitive.stderr b/src/tools/miri/tests/fail/dangling_pointers/dangling_primitive.stderr
index d89f79ec1d56..354cb882fd9f 100644
--- a/src/tools/miri/tests/fail/dangling_pointers/dangling_primitive.stderr
+++ b/src/tools/miri/tests/fail/dangling_pointers/dangling_primitive.stderr
@@ -16,8 +16,6 @@ help: ALLOC was deallocated here:
    |
 LL |     };
    |     ^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at RUSTLIB/std/src/macros.rs:LL:CC
    = note: this error originates in the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
diff --git a/src/tools/miri/tests/fail/dangling_pointers/deref-invalid-ptr.stderr b/src/tools/miri/tests/fail/dangling_pointers/deref-invalid-ptr.stderr
index 228c259d675d..21808abc5a42 100644
--- a/src/tools/miri/tests/fail/dangling_pointers/deref-invalid-ptr.stderr
+++ b/src/tools/miri/tests/fail/dangling_pointers/deref-invalid-ptr.stderr
@@ -6,8 +6,6 @@ LL |     let _y = unsafe { &*x as *const u32 };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/dangling_pointers/deref-invalid-ptr.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/dangling_pointers/deref_dangling_box.stderr b/src/tools/miri/tests/fail/dangling_pointers/deref_dangling_box.stderr
index 8c84975a7032..0ae38c3b326f 100644
--- a/src/tools/miri/tests/fail/dangling_pointers/deref_dangling_box.stderr
+++ b/src/tools/miri/tests/fail/dangling_pointers/deref_dangling_box.stderr
@@ -6,8 +6,6 @@ LL |     let _val = unsafe { addr_of_mut!(**outer) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at RUSTLIB/core/src/ptr/mod.rs:LL:CC
    = note: this error originates in the macro `addr_of_mut` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
diff --git a/src/tools/miri/tests/fail/dangling_pointers/deref_dangling_ref.stderr b/src/tools/miri/tests/fail/dangling_pointers/deref_dangling_ref.stderr
index 8458a35ef217..c10dc19f3626 100644
--- a/src/tools/miri/tests/fail/dangling_pointers/deref_dangling_ref.stderr
+++ b/src/tools/miri/tests/fail/dangling_pointers/deref_dangling_ref.stderr
@@ -6,8 +6,6 @@ LL |     let _val = unsafe { addr_of_mut!(**outer) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at RUSTLIB/core/src/ptr/mod.rs:LL:CC
    = note: this error originates in the macro `addr_of_mut` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
diff --git a/src/tools/miri/tests/fail/dangling_pointers/dyn_size.stderr b/src/tools/miri/tests/fail/dangling_pointers/dyn_size.stderr
index 5ea0d022c3d7..74102f7e1b5e 100644
--- a/src/tools/miri/tests/fail/dangling_pointers/dyn_size.stderr
+++ b/src/tools/miri/tests/fail/dangling_pointers/dyn_size.stderr
@@ -6,8 +6,6 @@ LL |     let _ptr = unsafe { &*ptr };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/dangling_pointers/dyn_size.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/dangling_pointers/null_pointer_deref.stderr b/src/tools/miri/tests/fail/dangling_pointers/null_pointer_deref.stderr
index d46d2c33122a..ce373668d161 100644
--- a/src/tools/miri/tests/fail/dangling_pointers/null_pointer_deref.stderr
+++ b/src/tools/miri/tests/fail/dangling_pointers/null_pointer_deref.stderr
@@ -6,8 +6,6 @@ LL |     let x: i32 = unsafe { *std::ptr::null() };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/dangling_pointers/null_pointer_deref.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/dangling_pointers/null_pointer_write.stderr b/src/tools/miri/tests/fail/dangling_pointers/null_pointer_write.stderr
index bb12031a3f2b..b4097cc808c9 100644
--- a/src/tools/miri/tests/fail/dangling_pointers/null_pointer_write.stderr
+++ b/src/tools/miri/tests/fail/dangling_pointers/null_pointer_write.stderr
@@ -6,8 +6,6 @@ LL |     unsafe { *std::ptr::null_mut() = 0i32 };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/dangling_pointers/null_pointer_write.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/dangling_pointers/out_of_bounds_project.stderr b/src/tools/miri/tests/fail/dangling_pointers/out_of_bounds_project.stderr
index bd531c94dd0f..80de6e152f09 100644
--- a/src/tools/miri/tests/fail/dangling_pointers/out_of_bounds_project.stderr
+++ b/src/tools/miri/tests/fail/dangling_pointers/out_of_bounds_project.stderr
@@ -11,8 +11,6 @@ help: ALLOC was allocated here:
    |
 LL |     let v = 0u32;
    |         ^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at RUSTLIB/core/src/ptr/mod.rs:LL:CC
    = note: this error originates in the macro `addr_of` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
diff --git a/src/tools/miri/tests/fail/dangling_pointers/out_of_bounds_read.stderr b/src/tools/miri/tests/fail/dangling_pointers/out_of_bounds_read.stderr
index df83190c29fa..b957056ad36e 100644
--- a/src/tools/miri/tests/fail/dangling_pointers/out_of_bounds_read.stderr
+++ b/src/tools/miri/tests/fail/dangling_pointers/out_of_bounds_read.stderr
@@ -11,8 +11,6 @@ help: ALLOC was allocated here:
    |
 LL |     let v: Vec<u16> = vec![1, 2];
    |                       ^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/dangling_pointers/out_of_bounds_read.rs:LL:CC
    = note: this error originates in the macro `vec` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
diff --git a/src/tools/miri/tests/fail/dangling_pointers/out_of_bounds_read_neg_offset.stderr b/src/tools/miri/tests/fail/dangling_pointers/out_of_bounds_read_neg_offset.stderr
index 5c37caa1ebf0..6cae87b759ee 100644
--- a/src/tools/miri/tests/fail/dangling_pointers/out_of_bounds_read_neg_offset.stderr
+++ b/src/tools/miri/tests/fail/dangling_pointers/out_of_bounds_read_neg_offset.stderr
@@ -11,8 +11,6 @@ help: ALLOC was allocated here:
    |
 LL |     let v: Vec<u16> = vec![1, 2];
    |                       ^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/dangling_pointers/out_of_bounds_read_neg_offset.rs:LL:CC
    = note: this error originates in the macro `vec` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
diff --git a/src/tools/miri/tests/fail/dangling_pointers/out_of_bounds_write.stderr b/src/tools/miri/tests/fail/dangling_pointers/out_of_bounds_write.stderr
index 5c0485a848d3..13e83e4696cf 100644
--- a/src/tools/miri/tests/fail/dangling_pointers/out_of_bounds_write.stderr
+++ b/src/tools/miri/tests/fail/dangling_pointers/out_of_bounds_write.stderr
@@ -11,8 +11,6 @@ help: ALLOC was allocated here:
    |
 LL |     let mut v: Vec<u16> = vec![1, 2];
    |                           ^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/dangling_pointers/out_of_bounds_write.rs:LL:CC
    = note: this error originates in the macro `vec` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
diff --git a/src/tools/miri/tests/fail/dangling_pointers/stack_temporary.stderr b/src/tools/miri/tests/fail/dangling_pointers/stack_temporary.stderr
index 79cb8e9f8faa..3faff2248e40 100644
--- a/src/tools/miri/tests/fail/dangling_pointers/stack_temporary.stderr
+++ b/src/tools/miri/tests/fail/dangling_pointers/stack_temporary.stderr
@@ -16,8 +16,6 @@ help: ALLOC was deallocated here:
    |
 LL |         let x = make_ref(&mut 0); // The temporary storing "0" is deallocated at the ";"!
    |                                 ^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/dangling_pointers/stack_temporary.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/dangling_pointers/wild_pointer_deref.stderr b/src/tools/miri/tests/fail/dangling_pointers/wild_pointer_deref.stderr
index 8a8dd9b8f425..6caa4f376d8a 100644
--- a/src/tools/miri/tests/fail/dangling_pointers/wild_pointer_deref.stderr
+++ b/src/tools/miri/tests/fail/dangling_pointers/wild_pointer_deref.stderr
@@ -6,8 +6,6 @@ LL |     let x = unsafe { *p };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/dangling_pointers/wild_pointer_deref.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/alloc_read_race.stderr b/src/tools/miri/tests/fail/data_race/alloc_read_race.stderr
index 5e4a09dd0d08..d4933db2ed57 100644
--- a/src/tools/miri/tests/fail/data_race/alloc_read_race.stderr
+++ b/src/tools/miri/tests/fail/data_race/alloc_read_race.stderr
@@ -11,8 +11,6 @@ LL |             pointer.store(Box::into_raw(Box::new_uninit()), Ordering::Relax
    |                                         ^^^^^^^^^^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/alloc_read_race.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/alloc_write_race.stderr b/src/tools/miri/tests/fail/data_race/alloc_write_race.stderr
index 69bfc33f3779..da7f5ed869db 100644
--- a/src/tools/miri/tests/fail/data_race/alloc_write_race.stderr
+++ b/src/tools/miri/tests/fail/data_race/alloc_write_race.stderr
@@ -11,8 +11,6 @@ LL |                 .store(Box::into_raw(Box::<usize>::new_uninit()) as *mut us
    |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/alloc_write_race.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race1.stderr b/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race1.stderr
index 0da4914d4110..203e6a10e497 100644
--- a/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race1.stderr
+++ b/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race1.stderr
@@ -11,8 +11,6 @@ LL |             *(c.0 as *mut usize) = 32;
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/atomic_read_na_write_race1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race2.stderr b/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race2.stderr
index a30d3f749065..791dc71f9930 100644
--- a/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race2.stderr
+++ b/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race2.stderr
@@ -11,8 +11,6 @@ LL |             atomic_ref.load(Ordering::SeqCst)
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/atomic_read_na_write_race2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race1.stderr b/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race1.stderr
index dad28c38c179..73d963875fb1 100644
--- a/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race1.stderr
+++ b/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race1.stderr
@@ -11,8 +11,6 @@ LL |             atomic_ref.store(32, Ordering::SeqCst)
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/atomic_write_na_read_race1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race2.stderr b/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race2.stderr
index b2b121b3188d..066fff5e3d36 100644
--- a/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race2.stderr
+++ b/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race2.stderr
@@ -11,8 +11,6 @@ LL |             let _val = *(c.0 as *mut usize);
    |                        ^^^^^^^^^^^^^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/atomic_write_na_read_race2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race1.stderr b/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race1.stderr
index 2a115cb51d69..10b7d8398d9d 100644
--- a/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race1.stderr
+++ b/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race1.stderr
@@ -11,8 +11,6 @@ LL |             *(c.0 as *mut usize) = 32;
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/atomic_write_na_write_race1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race2.stderr b/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race2.stderr
index 54ad60cad1bc..bb854bc4235c 100644
--- a/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race2.stderr
+++ b/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race2.stderr
@@ -11,8 +11,6 @@ LL |             atomic_ref.store(64, Ordering::SeqCst);
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/atomic_write_na_write_race2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/dangling_thread_async_race.stderr b/src/tools/miri/tests/fail/data_race/dangling_thread_async_race.stderr
index 0d026dddf815..8cecfbee9d95 100644
--- a/src/tools/miri/tests/fail/data_race/dangling_thread_async_race.stderr
+++ b/src/tools/miri/tests/fail/data_race/dangling_thread_async_race.stderr
@@ -11,8 +11,6 @@ LL |             *c.0 = 32;
    |             ^^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/dangling_thread_async_race.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/dangling_thread_race.stderr b/src/tools/miri/tests/fail/data_race/dangling_thread_race.stderr
index 1c4e03a32575..7260776043ea 100644
--- a/src/tools/miri/tests/fail/data_race/dangling_thread_race.stderr
+++ b/src/tools/miri/tests/fail/data_race/dangling_thread_race.stderr
@@ -11,8 +11,6 @@ LL |             *c.0 = 32;
    |             ^^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/data_race/dangling_thread_race.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/dealloc_read_race1.stderr b/src/tools/miri/tests/fail/data_race/dealloc_read_race1.stderr
index 006946f3f508..c4200ea96153 100644
--- a/src/tools/miri/tests/fail/data_race/dealloc_read_race1.stderr
+++ b/src/tools/miri/tests/fail/data_race/dealloc_read_race1.stderr
@@ -16,8 +16,6 @@ LL |             let _val = *ptr.0;
    |                        ^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/dealloc_read_race1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/dealloc_read_race2.stderr b/src/tools/miri/tests/fail/data_race/dealloc_read_race2.stderr
index 30d1fbbf6d82..5ab5c9655d78 100644
--- a/src/tools/miri/tests/fail/data_race/dealloc_read_race2.stderr
+++ b/src/tools/miri/tests/fail/data_race/dealloc_read_race2.stderr
@@ -20,8 +20,6 @@ LL | |                 std::mem::size_of::<usize>(),
 LL | |                 std::mem::align_of::<usize>(),
 LL | |             )
    | |_____________^
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/dealloc_read_race2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/dealloc_read_race_stack.stderr b/src/tools/miri/tests/fail/data_race/dealloc_read_race_stack.stderr
index f80e36d4b8fb..b52e48827b4b 100644
--- a/src/tools/miri/tests/fail/data_race/dealloc_read_race_stack.stderr
+++ b/src/tools/miri/tests/fail/data_race/dealloc_read_race_stack.stderr
@@ -11,8 +11,6 @@ LL |             *pointer.load(Ordering::Acquire)
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/dealloc_read_race_stack.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/dealloc_write_race1.stderr b/src/tools/miri/tests/fail/data_race/dealloc_write_race1.stderr
index 41482e4941c1..0a574068d4e7 100644
--- a/src/tools/miri/tests/fail/data_race/dealloc_write_race1.stderr
+++ b/src/tools/miri/tests/fail/data_race/dealloc_write_race1.stderr
@@ -16,8 +16,6 @@ LL |             *ptr.0 = 2;
    |             ^^^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/dealloc_write_race1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/dealloc_write_race2.stderr b/src/tools/miri/tests/fail/data_race/dealloc_write_race2.stderr
index 8a337dbc77c2..9fbae21eb891 100644
--- a/src/tools/miri/tests/fail/data_race/dealloc_write_race2.stderr
+++ b/src/tools/miri/tests/fail/data_race/dealloc_write_race2.stderr
@@ -20,8 +20,6 @@ LL | |                 std::mem::size_of::<usize>(),
 LL | |                 std::mem::align_of::<usize>(),
 LL | |             );
    | |_____________^
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/dealloc_write_race2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/dealloc_write_race_stack.stderr b/src/tools/miri/tests/fail/data_race/dealloc_write_race_stack.stderr
index e6ebd5b6278e..0c853ccb8cc1 100644
--- a/src/tools/miri/tests/fail/data_race/dealloc_write_race_stack.stderr
+++ b/src/tools/miri/tests/fail/data_race/dealloc_write_race_stack.stderr
@@ -11,8 +11,6 @@ LL |             *pointer.load(Ordering::Acquire) = 3;
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/dealloc_write_race_stack.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/enable_after_join_to_main.stderr b/src/tools/miri/tests/fail/data_race/enable_after_join_to_main.stderr
index c6db02fa5ae7..a8eee1241b65 100644
--- a/src/tools/miri/tests/fail/data_race/enable_after_join_to_main.stderr
+++ b/src/tools/miri/tests/fail/data_race/enable_after_join_to_main.stderr
@@ -11,8 +11,6 @@ LL |             *c.0 = 32;
    |             ^^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/enable_after_join_to_main.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/fence_after_load.stderr b/src/tools/miri/tests/fail/data_race/fence_after_load.stderr
index 890bacd58d4d..bf2ac30a1e3f 100644
--- a/src/tools/miri/tests/fail/data_race/fence_after_load.stderr
+++ b/src/tools/miri/tests/fail/data_race/fence_after_load.stderr
@@ -11,8 +11,6 @@ LL |         unsafe { V = 1 }
    |                  ^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/data_race/fence_after_load.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/local_variable_alloc_race.stderr b/src/tools/miri/tests/fail/data_race/local_variable_alloc_race.stderr
index ea2bf3fc9f2f..52bd7721ef22 100644
--- a/src/tools/miri/tests/fail/data_race/local_variable_alloc_race.stderr
+++ b/src/tools/miri/tests/fail/data_race/local_variable_alloc_race.stderr
@@ -11,8 +11,6 @@ LL |             StorageLive(val);
    |             ^^^^^^^^^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/local_variable_alloc_race.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/local_variable_read_race.stderr b/src/tools/miri/tests/fail/data_race/local_variable_read_race.stderr
index 215842d1815c..969b6faadbe1 100644
--- a/src/tools/miri/tests/fail/data_race/local_variable_read_race.stderr
+++ b/src/tools/miri/tests/fail/data_race/local_variable_read_race.stderr
@@ -11,8 +11,6 @@ LL |     let _val = val;
    |                ^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/local_variable_read_race.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/local_variable_write_race.stderr b/src/tools/miri/tests/fail/data_race/local_variable_write_race.stderr
index ce0c22561dad..0bf7dd28c0f9 100644
--- a/src/tools/miri/tests/fail/data_race/local_variable_write_race.stderr
+++ b/src/tools/miri/tests/fail/data_race/local_variable_write_race.stderr
@@ -11,8 +11,6 @@ LL |     let mut val: u8 = 0;
    |                       ^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/local_variable_write_race.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/mixed_size_read_read_write.match_first_load.stderr b/src/tools/miri/tests/fail/data_race/mixed_size_read_read_write.match_first_load.stderr
index ba714868d013..087f326053b5 100644
--- a/src/tools/miri/tests/fail/data_race/mixed_size_read_read_write.match_first_load.stderr
+++ b/src/tools/miri/tests/fail/data_race/mixed_size_read_read_write.match_first_load.stderr
@@ -13,8 +13,6 @@ LL |             a16.load(Ordering::SeqCst);
    = help: see https://doc.rust-lang.org/nightly/std/sync/atomic/index.html#memory-model-for-atomic-accesses for more information about the Rust memory model
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/mixed_size_read_read_write.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/mixed_size_read_read_write.match_second_load.stderr b/src/tools/miri/tests/fail/data_race/mixed_size_read_read_write.match_second_load.stderr
index 13749cc349ef..66aee703e4f3 100644
--- a/src/tools/miri/tests/fail/data_race/mixed_size_read_read_write.match_second_load.stderr
+++ b/src/tools/miri/tests/fail/data_race/mixed_size_read_read_write.match_second_load.stderr
@@ -13,8 +13,6 @@ LL |             a16.load(Ordering::SeqCst);
    = help: see https://doc.rust-lang.org/nightly/std/sync/atomic/index.html#memory-model-for-atomic-accesses for more information about the Rust memory model
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/mixed_size_read_read_write.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/mixed_size_read_write.read_write.stderr b/src/tools/miri/tests/fail/data_race/mixed_size_read_write.read_write.stderr
index 11c66554fae7..967fd45c5b36 100644
--- a/src/tools/miri/tests/fail/data_race/mixed_size_read_write.read_write.stderr
+++ b/src/tools/miri/tests/fail/data_race/mixed_size_read_write.read_write.stderr
@@ -13,8 +13,6 @@ LL |             a8[0].load(Ordering::SeqCst);
    = help: see https://doc.rust-lang.org/nightly/std/sync/atomic/index.html#memory-model-for-atomic-accesses for more information about the Rust memory model
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/mixed_size_read_write.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/mixed_size_read_write.write_read.stderr b/src/tools/miri/tests/fail/data_race/mixed_size_read_write.write_read.stderr
index 4fa08032f44d..7664c3f13e3d 100644
--- a/src/tools/miri/tests/fail/data_race/mixed_size_read_write.write_read.stderr
+++ b/src/tools/miri/tests/fail/data_race/mixed_size_read_write.write_read.stderr
@@ -13,8 +13,6 @@ LL |             a16.store(1, Ordering::SeqCst);
    = help: see https://doc.rust-lang.org/nightly/std/sync/atomic/index.html#memory-model-for-atomic-accesses for more information about the Rust memory model
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/mixed_size_read_write.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/mixed_size_write_write.fst.stderr b/src/tools/miri/tests/fail/data_race/mixed_size_write_write.fst.stderr
index 26eddd3f193f..7e30cf6856de 100644
--- a/src/tools/miri/tests/fail/data_race/mixed_size_write_write.fst.stderr
+++ b/src/tools/miri/tests/fail/data_race/mixed_size_write_write.fst.stderr
@@ -13,8 +13,6 @@ LL |             a16.store(1, Ordering::SeqCst);
    = help: see https://doc.rust-lang.org/nightly/std/sync/atomic/index.html#memory-model-for-atomic-accesses for more information about the Rust memory model
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/mixed_size_write_write.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/mixed_size_write_write.snd.stderr b/src/tools/miri/tests/fail/data_race/mixed_size_write_write.snd.stderr
index e0ca01456064..74bb72b986af 100644
--- a/src/tools/miri/tests/fail/data_race/mixed_size_write_write.snd.stderr
+++ b/src/tools/miri/tests/fail/data_race/mixed_size_write_write.snd.stderr
@@ -13,8 +13,6 @@ LL |             a16.store(1, Ordering::SeqCst);
    = help: see https://doc.rust-lang.org/nightly/std/sync/atomic/index.html#memory-model-for-atomic-accesses for more information about the Rust memory model
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/mixed_size_write_write.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/read_write_race.stderr b/src/tools/miri/tests/fail/data_race/read_write_race.stderr
index c0754f6db4c5..ce063d8c532f 100644
--- a/src/tools/miri/tests/fail/data_race/read_write_race.stderr
+++ b/src/tools/miri/tests/fail/data_race/read_write_race.stderr
@@ -11,8 +11,6 @@ LL |             let _val = *c.0;
    |                        ^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/read_write_race.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/read_write_race_stack.stderr b/src/tools/miri/tests/fail/data_race/read_write_race_stack.stderr
index 3f6b042de568..5ac78a2ecf6b 100644
--- a/src/tools/miri/tests/fail/data_race/read_write_race_stack.stderr
+++ b/src/tools/miri/tests/fail/data_race/read_write_race_stack.stderr
@@ -11,8 +11,6 @@ LL |             *pointer.load(Ordering::Acquire) = 3;
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/read_write_race_stack.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/relax_acquire_race.stderr b/src/tools/miri/tests/fail/data_race/relax_acquire_race.stderr
index fdd8971f6075..fffde0370a2a 100644
--- a/src/tools/miri/tests/fail/data_race/relax_acquire_race.stderr
+++ b/src/tools/miri/tests/fail/data_race/relax_acquire_race.stderr
@@ -11,8 +11,6 @@ LL |             *c.0 = 1;
    |             ^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/relax_acquire_race.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/release_seq_race.stderr b/src/tools/miri/tests/fail/data_race/release_seq_race.stderr
index 2ee859dc45c6..61f5501434b8 100644
--- a/src/tools/miri/tests/fail/data_race/release_seq_race.stderr
+++ b/src/tools/miri/tests/fail/data_race/release_seq_race.stderr
@@ -11,8 +11,6 @@ LL |             *c.0 = 1;
    |             ^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/release_seq_race.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/release_seq_race_same_thread.stderr b/src/tools/miri/tests/fail/data_race/release_seq_race_same_thread.stderr
index 74b844689138..2c28ee03e786 100644
--- a/src/tools/miri/tests/fail/data_race/release_seq_race_same_thread.stderr
+++ b/src/tools/miri/tests/fail/data_race/release_seq_race_same_thread.stderr
@@ -11,8 +11,6 @@ LL |             *c.0 = 1;
    |             ^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/release_seq_race_same_thread.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/rmw_race.stderr b/src/tools/miri/tests/fail/data_race/rmw_race.stderr
index a9a97a3a3e79..04621ff07b81 100644
--- a/src/tools/miri/tests/fail/data_race/rmw_race.stderr
+++ b/src/tools/miri/tests/fail/data_race/rmw_race.stderr
@@ -11,8 +11,6 @@ LL |             *c.0 = 1;
    |             ^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/rmw_race.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/stack_pop_race.stderr b/src/tools/miri/tests/fail/data_race/stack_pop_race.stderr
index 3ba949bf9678..130a31ebeef0 100644
--- a/src/tools/miri/tests/fail/data_race/stack_pop_race.stderr
+++ b/src/tools/miri/tests/fail/data_race/stack_pop_race.stderr
@@ -11,8 +11,6 @@ LL |         let _val = unsafe { *ptr.0 };
    |                             ^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/data_race/stack_pop_race.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/write_write_race.stderr b/src/tools/miri/tests/fail/data_race/write_write_race.stderr
index 314ea608190a..03bee0060a4e 100644
--- a/src/tools/miri/tests/fail/data_race/write_write_race.stderr
+++ b/src/tools/miri/tests/fail/data_race/write_write_race.stderr
@@ -11,8 +11,6 @@ LL |             *c.0 = 32;
    |             ^^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/write_write_race.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/data_race/write_write_race_stack.stderr b/src/tools/miri/tests/fail/data_race/write_write_race_stack.stderr
index 71334019f6b7..cb2faf4ac274 100644
--- a/src/tools/miri/tests/fail/data_race/write_write_race_stack.stderr
+++ b/src/tools/miri/tests/fail/data_race/write_write_race_stack.stderr
@@ -11,8 +11,6 @@ LL |             *pointer.load(Ordering::Acquire) = 3;
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/data_race/write_write_race_stack.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/dyn-call-trait-mismatch.stderr b/src/tools/miri/tests/fail/dyn-call-trait-mismatch.stderr
index 3cb917d39fdc..ce686cce27a5 100644
--- a/src/tools/miri/tests/fail/dyn-call-trait-mismatch.stderr
+++ b/src/tools/miri/tests/fail/dyn-call-trait-mismatch.stderr
@@ -6,8 +6,6 @@ LL |     r2.method2();
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/dyn-call-trait-mismatch.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/dyn-upcast-nop-wrong-trait.stderr b/src/tools/miri/tests/fail/dyn-upcast-nop-wrong-trait.stderr
index bf7fc7ed8a26..65ad97f4911b 100644
--- a/src/tools/miri/tests/fail/dyn-upcast-nop-wrong-trait.stderr
+++ b/src/tools/miri/tests/fail/dyn-upcast-nop-wrong-trait.stderr
@@ -6,8 +6,6 @@ LL |     let ptr: *const (dyn fmt::Debug + Send + Sync) = unsafe { std::mem::tra
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/dyn-upcast-nop-wrong-trait.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/dyn-upcast-trait-mismatch.stderr b/src/tools/miri/tests/fail/dyn-upcast-trait-mismatch.stderr
index f5e72e6ee0f8..ecc99f405ab1 100644
--- a/src/tools/miri/tests/fail/dyn-upcast-trait-mismatch.stderr
+++ b/src/tools/miri/tests/fail/dyn-upcast-trait-mismatch.stderr
@@ -6,8 +6,6 @@ LL |         let _err = baz_fake as *const dyn Foo;
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/dyn-upcast-trait-mismatch.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/enum-untagged-variant-invalid-encoding.stderr b/src/tools/miri/tests/fail/enum-untagged-variant-invalid-encoding.stderr
index 2099041c6ce1..e019a350ba17 100644
--- a/src/tools/miri/tests/fail/enum-untagged-variant-invalid-encoding.stderr
+++ b/src/tools/miri/tests/fail/enum-untagged-variant-invalid-encoding.stderr
@@ -6,8 +6,6 @@ LL |         assert!(matches!(invalid, Foo::Var2(_)));
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/enum-untagged-variant-invalid-encoding.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/environ-gets-deallocated.stderr b/src/tools/miri/tests/fail/environ-gets-deallocated.stderr
index fcc5a8d2c804..7bcb09bf5f21 100644
--- a/src/tools/miri/tests/fail/environ-gets-deallocated.stderr
+++ b/src/tools/miri/tests/fail/environ-gets-deallocated.stderr
@@ -6,8 +6,6 @@ LL |     let _y = unsafe { *pointer };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/environ-gets-deallocated.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/extern-type-field-offset.stderr b/src/tools/miri/tests/fail/extern-type-field-offset.stderr
index 90f104ec298d..187f14faf408 100644
--- a/src/tools/miri/tests/fail/extern-type-field-offset.stderr
+++ b/src/tools/miri/tests/fail/extern-type-field-offset.stderr
@@ -6,8 +6,6 @@ LL |     let x: &Newtype = unsafe { &*(&buf as *const _ as *const Newtype) };
    |
    = help: `extern type` are not compatible with the Stacked Borrows aliasing model implemented by Miri; Miri may miss bugs in this code
    = help: try running with `MIRIFLAGS=-Zmiri-tree-borrows` to use the more permissive but also even more experimental Tree Borrows aliasing checks instead
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/extern-type-field-offset.rs:LL:CC
 
 error: unsupported operation: `extern type` field does not have a known offset
   --> tests/fail/extern-type-field-offset.rs:LL:CC
@@ -16,8 +14,6 @@ LL |     let _field = &x.a;
    |                  ^^^^ unsupported operation occurred here
    |
    = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/extern-type-field-offset.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/extern_static.stderr b/src/tools/miri/tests/fail/extern_static.stderr
index 5bc835cfcc0d..e4c51c0345d4 100644
--- a/src/tools/miri/tests/fail/extern_static.stderr
+++ b/src/tools/miri/tests/fail/extern_static.stderr
@@ -5,8 +5,6 @@ LL |     let _val = std::ptr::addr_of!(FOO);
    |                                   ^^^ unsupported operation occurred here
    |
    = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/extern_static.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/extern_static_in_const.stderr b/src/tools/miri/tests/fail/extern_static_in_const.stderr
index deca69060ac1..f0f0966ea8af 100644
--- a/src/tools/miri/tests/fail/extern_static_in_const.stderr
+++ b/src/tools/miri/tests/fail/extern_static_in_const.stderr
@@ -5,8 +5,6 @@ LL |     let _val = X;
    |                ^ unsupported operation occurred here
    |
    = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/extern_static_in_const.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/extern_static_wrong_size.stderr b/src/tools/miri/tests/fail/extern_static_wrong_size.stderr
index fce4ff9ad1f1..0862f9779287 100644
--- a/src/tools/miri/tests/fail/extern_static_wrong_size.stderr
+++ b/src/tools/miri/tests/fail/extern_static_wrong_size.stderr
@@ -5,8 +5,6 @@ LL |     let _val = unsafe { environ };
    |                         ^^^^^^^ unsupported operation occurred here
    |
    = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/extern_static_wrong_size.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_calls/arg_inplace_locals_alias.stack.stderr b/src/tools/miri/tests/fail/function_calls/arg_inplace_locals_alias.stack.stderr
index 0c1100cae63d..a86c68cebd23 100644
--- a/src/tools/miri/tests/fail/function_calls/arg_inplace_locals_alias.stack.stderr
+++ b/src/tools/miri/tests/fail/function_calls/arg_inplace_locals_alias.stack.stderr
@@ -16,8 +16,6 @@ help: <TAG> is this argument
    |
 LL |     y.0 = 0;
    |     ^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/function_calls/arg_inplace_locals_alias.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_calls/arg_inplace_locals_alias.tree.stderr b/src/tools/miri/tests/fail/function_calls/arg_inplace_locals_alias.tree.stderr
index 2d9ce2aa1fb6..d62adeeb8420 100644
--- a/src/tools/miri/tests/fail/function_calls/arg_inplace_locals_alias.tree.stderr
+++ b/src/tools/miri/tests/fail/function_calls/arg_inplace_locals_alias.tree.stderr
@@ -25,8 +25,6 @@ help: the protected tag <TAG> later transitioned to Unique due to a child write
 LL |     y.0 = 0;
    |     ^^^^^^^
    = help: this transition corresponds to the first write to a 2-phase borrowed mutable reference
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/function_calls/arg_inplace_locals_alias.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_calls/arg_inplace_locals_alias_ret.stack.stderr b/src/tools/miri/tests/fail/function_calls/arg_inplace_locals_alias_ret.stack.stderr
index fcd5b8752e7d..491d01cf4284 100644
--- a/src/tools/miri/tests/fail/function_calls/arg_inplace_locals_alias_ret.stack.stderr
+++ b/src/tools/miri/tests/fail/function_calls/arg_inplace_locals_alias_ret.stack.stderr
@@ -16,8 +16,6 @@ help: <TAG> is this argument
    |
 LL |     x
    |     ^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/function_calls/arg_inplace_locals_alias_ret.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_calls/arg_inplace_locals_alias_ret.tree.stderr b/src/tools/miri/tests/fail/function_calls/arg_inplace_locals_alias_ret.tree.stderr
index 42e391b5daf0..3c1038d364bb 100644
--- a/src/tools/miri/tests/fail/function_calls/arg_inplace_locals_alias_ret.tree.stderr
+++ b/src/tools/miri/tests/fail/function_calls/arg_inplace_locals_alias_ret.tree.stderr
@@ -25,8 +25,6 @@ help: the protected tag <TAG> later transitioned to Unique due to a child write
 LL |     x
    |     ^
    = help: this transition corresponds to the first write to a 2-phase borrowed mutable reference
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/function_calls/arg_inplace_locals_alias_ret.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_calls/arg_inplace_observe_after.stderr b/src/tools/miri/tests/fail/function_calls/arg_inplace_observe_after.stderr
index 3252368ea6de..f41b6cf55882 100644
--- a/src/tools/miri/tests/fail/function_calls/arg_inplace_observe_after.stderr
+++ b/src/tools/miri/tests/fail/function_calls/arg_inplace_observe_after.stderr
@@ -6,8 +6,6 @@ LL |             _observe = non_copy.0;
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_calls/arg_inplace_observe_after.rs:LL:CC
 
 Uninitialized memory occurred at ALLOC[0x0..0x4], in this allocation:
 ALLOC (stack variable, size: 4, align: 4) {
diff --git a/src/tools/miri/tests/fail/function_calls/check_arg_abi.stderr b/src/tools/miri/tests/fail/function_calls/check_arg_abi.stderr
index 83d3e6d3d1eb..84a3c7553894 100644
--- a/src/tools/miri/tests/fail/function_calls/check_arg_abi.stderr
+++ b/src/tools/miri/tests/fail/function_calls/check_arg_abi.stderr
@@ -6,8 +6,6 @@ LL |         let _ = malloc(0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_calls/check_arg_abi.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_calls/check_arg_count_abort.stderr b/src/tools/miri/tests/fail/function_calls/check_arg_count_abort.stderr
index 739507fde0ef..5b4703ca1660 100644
--- a/src/tools/miri/tests/fail/function_calls/check_arg_count_abort.stderr
+++ b/src/tools/miri/tests/fail/function_calls/check_arg_count_abort.stderr
@@ -6,8 +6,6 @@ LL |         abort(1);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_calls/check_arg_count_abort.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_calls/check_arg_count_too_few_args.stderr b/src/tools/miri/tests/fail/function_calls/check_arg_count_too_few_args.stderr
index ad1dbb034764..5f81145d26af 100644
--- a/src/tools/miri/tests/fail/function_calls/check_arg_count_too_few_args.stderr
+++ b/src/tools/miri/tests/fail/function_calls/check_arg_count_too_few_args.stderr
@@ -6,8 +6,6 @@ LL |         let _ = malloc();
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_calls/check_arg_count_too_few_args.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_calls/check_arg_count_too_many_args.stderr b/src/tools/miri/tests/fail/function_calls/check_arg_count_too_many_args.stderr
index 9dae9a02a16d..3ed4aaacb8c4 100644
--- a/src/tools/miri/tests/fail/function_calls/check_arg_count_too_many_args.stderr
+++ b/src/tools/miri/tests/fail/function_calls/check_arg_count_too_many_args.stderr
@@ -6,8 +6,6 @@ LL |         let _ = malloc(1, 2);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_calls/check_arg_count_too_many_args.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_calls/check_callback_abi.stderr b/src/tools/miri/tests/fail/function_calls/check_callback_abi.stderr
index cbca7e920b7b..c395af97ef3a 100644
--- a/src/tools/miri/tests/fail/function_calls/check_callback_abi.stderr
+++ b/src/tools/miri/tests/fail/function_calls/check_callback_abi.stderr
@@ -11,8 +11,6 @@ LL | |         );
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_calls/check_callback_abi.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_calls/exported_symbol_abi_mismatch.cache.stderr b/src/tools/miri/tests/fail/function_calls/exported_symbol_abi_mismatch.cache.stderr
index 6a8f444b37c5..c1f11bcd24c5 100644
--- a/src/tools/miri/tests/fail/function_calls/exported_symbol_abi_mismatch.cache.stderr
+++ b/src/tools/miri/tests/fail/function_calls/exported_symbol_abi_mismatch.cache.stderr
@@ -6,8 +6,6 @@ LL |             foo();
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_calls/exported_symbol_abi_mismatch.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_calls/exported_symbol_abi_mismatch.fn_ptr.stderr b/src/tools/miri/tests/fail/function_calls/exported_symbol_abi_mismatch.fn_ptr.stderr
index 07bd5e0effca..cbc51519af69 100644
--- a/src/tools/miri/tests/fail/function_calls/exported_symbol_abi_mismatch.fn_ptr.stderr
+++ b/src/tools/miri/tests/fail/function_calls/exported_symbol_abi_mismatch.fn_ptr.stderr
@@ -6,8 +6,6 @@ LL |         std::mem::transmute::<unsafe fn(), unsafe extern "C" fn()>(foo)();
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_calls/exported_symbol_abi_mismatch.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_calls/exported_symbol_abi_mismatch.no_cache.stderr b/src/tools/miri/tests/fail/function_calls/exported_symbol_abi_mismatch.no_cache.stderr
index 6a8f444b37c5..c1f11bcd24c5 100644
--- a/src/tools/miri/tests/fail/function_calls/exported_symbol_abi_mismatch.no_cache.stderr
+++ b/src/tools/miri/tests/fail/function_calls/exported_symbol_abi_mismatch.no_cache.stderr
@@ -6,8 +6,6 @@ LL |             foo();
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_calls/exported_symbol_abi_mismatch.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_calls/exported_symbol_bad_unwind1.stderr b/src/tools/miri/tests/fail/function_calls/exported_symbol_bad_unwind1.stderr
index afabb8572bdf..000cf645e8dd 100644
--- a/src/tools/miri/tests/fail/function_calls/exported_symbol_bad_unwind1.stderr
+++ b/src/tools/miri/tests/fail/function_calls/exported_symbol_bad_unwind1.stderr
@@ -11,8 +11,6 @@ LL |     unsafe { unwind() }
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_calls/exported_symbol_bad_unwind1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_calls/exported_symbol_bad_unwind2.extern_block.stderr b/src/tools/miri/tests/fail/function_calls/exported_symbol_bad_unwind2.extern_block.stderr
index eaca0d3f0122..c260a8317757 100644
--- a/src/tools/miri/tests/fail/function_calls/exported_symbol_bad_unwind2.extern_block.stderr
+++ b/src/tools/miri/tests/fail/function_calls/exported_symbol_bad_unwind2.extern_block.stderr
@@ -11,8 +11,6 @@ LL |     unsafe { nounwind() }
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_calls/exported_symbol_bad_unwind2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_calls/exported_symbol_clashing.stderr b/src/tools/miri/tests/fail/function_calls/exported_symbol_clashing.stderr
index 50ca5c611def..a4edb552517f 100644
--- a/src/tools/miri/tests/fail/function_calls/exported_symbol_clashing.stderr
+++ b/src/tools/miri/tests/fail/function_calls/exported_symbol_clashing.stderr
@@ -14,8 +14,6 @@ help: then it's defined here again, in crate `exported_symbol_clashing`
    |
 LL | fn bar() {}
    | ^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/function_calls/exported_symbol_clashing.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_calls/exported_symbol_shim_clashing.stderr b/src/tools/miri/tests/fail/function_calls/exported_symbol_shim_clashing.stderr
index ea3b73f87245..0e2b4da5c0a0 100644
--- a/src/tools/miri/tests/fail/function_calls/exported_symbol_shim_clashing.stderr
+++ b/src/tools/miri/tests/fail/function_calls/exported_symbol_shim_clashing.stderr
@@ -12,8 +12,6 @@ LL | |
 LL | |     unreachable!()
 LL | | }
    | |_^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/function_calls/exported_symbol_shim_clashing.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_calls/exported_symbol_wrong_arguments.stderr b/src/tools/miri/tests/fail/function_calls/exported_symbol_wrong_arguments.stderr
index 6699e5fea13a..75c060ea51d4 100644
--- a/src/tools/miri/tests/fail/function_calls/exported_symbol_wrong_arguments.stderr
+++ b/src/tools/miri/tests/fail/function_calls/exported_symbol_wrong_arguments.stderr
@@ -6,8 +6,6 @@ LL |     unsafe { foo(1) }
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_calls/exported_symbol_wrong_arguments.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_calls/exported_symbol_wrong_type.stderr b/src/tools/miri/tests/fail/function_calls/exported_symbol_wrong_type.stderr
index 7a4f3f17f6f4..01c59a77b48c 100644
--- a/src/tools/miri/tests/fail/function_calls/exported_symbol_wrong_type.stderr
+++ b/src/tools/miri/tests/fail/function_calls/exported_symbol_wrong_type.stderr
@@ -6,8 +6,6 @@ LL |     unsafe { FOO() }
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_calls/exported_symbol_wrong_type.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_calls/return_pointer_on_unwind.stderr b/src/tools/miri/tests/fail/function_calls/return_pointer_on_unwind.stderr
index 77dc2c61e260..d653ec3a069c 100644
--- a/src/tools/miri/tests/fail/function_calls/return_pointer_on_unwind.stderr
+++ b/src/tools/miri/tests/fail/function_calls/return_pointer_on_unwind.stderr
@@ -11,8 +11,6 @@ LL |     dbg!(x.0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at RUSTLIB/std/src/macros.rs:LL:CC
    = note: this error originates in the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 Uninitialized memory occurred at ALLOC[0x0..0x4], in this allocation:
diff --git a/src/tools/miri/tests/fail/function_calls/target_feature.stderr b/src/tools/miri/tests/fail/function_calls/target_feature.stderr
index e80e22346631..53a02b193526 100644
--- a/src/tools/miri/tests/fail/function_calls/target_feature.stderr
+++ b/src/tools/miri/tests/fail/function_calls/target_feature.stderr
@@ -6,8 +6,6 @@ LL |         ssse3_fn();
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_calls/target_feature.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_calls/target_feature_wasm.stderr b/src/tools/miri/tests/fail/function_calls/target_feature_wasm.stderr
index a89c59123450..869fa4715d69 100644
--- a/src/tools/miri/tests/fail/function_calls/target_feature_wasm.stderr
+++ b/src/tools/miri/tests/fail/function_calls/target_feature_wasm.stderr
@@ -3,9 +3,6 @@ error: abnormal termination: calling a function that requires unavailable target
    |
 LL |     simd128_fn();
    |     ^^^^^^^^^^^^ abnormal termination occurred here
-   |
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_calls/target_feature_wasm.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_pointers/abi_mismatch_array_vs_struct.stderr b/src/tools/miri/tests/fail/function_pointers/abi_mismatch_array_vs_struct.stderr
index f793abb0b62f..56e69e846696 100644
--- a/src/tools/miri/tests/fail/function_pointers/abi_mismatch_array_vs_struct.stderr
+++ b/src/tools/miri/tests/fail/function_pointers/abi_mismatch_array_vs_struct.stderr
@@ -8,8 +8,6 @@ LL |     g(Default::default())
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
    = help: this means these two types are not *guaranteed* to be ABI-compatible across all targets
    = help: if you think this code should be accepted anyway, please report an issue with Miri
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_pointers/abi_mismatch_array_vs_struct.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_pointers/abi_mismatch_int_vs_float.stderr b/src/tools/miri/tests/fail/function_pointers/abi_mismatch_int_vs_float.stderr
index 3651fc9b3f7a..cbef9d27cdf9 100644
--- a/src/tools/miri/tests/fail/function_pointers/abi_mismatch_int_vs_float.stderr
+++ b/src/tools/miri/tests/fail/function_pointers/abi_mismatch_int_vs_float.stderr
@@ -8,8 +8,6 @@ LL |     g(42)
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
    = help: this means these two types are not *guaranteed* to be ABI-compatible across all targets
    = help: if you think this code should be accepted anyway, please report an issue with Miri
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_pointers/abi_mismatch_int_vs_float.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_pointers/abi_mismatch_raw_pointer.stderr b/src/tools/miri/tests/fail/function_pointers/abi_mismatch_raw_pointer.stderr
index 88345a0688ca..cd14ea156a47 100644
--- a/src/tools/miri/tests/fail/function_pointers/abi_mismatch_raw_pointer.stderr
+++ b/src/tools/miri/tests/fail/function_pointers/abi_mismatch_raw_pointer.stderr
@@ -8,8 +8,6 @@ LL |     g(&42 as *const i32)
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
    = help: this means these two types are not *guaranteed* to be ABI-compatible across all targets
    = help: if you think this code should be accepted anyway, please report an issue with Miri
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_pointers/abi_mismatch_raw_pointer.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_pointers/abi_mismatch_repr_C.stderr b/src/tools/miri/tests/fail/function_pointers/abi_mismatch_repr_C.stderr
index 47658395132e..0e52dc02884c 100644
--- a/src/tools/miri/tests/fail/function_pointers/abi_mismatch_repr_C.stderr
+++ b/src/tools/miri/tests/fail/function_pointers/abi_mismatch_repr_C.stderr
@@ -8,8 +8,6 @@ LL |     fnptr(S1(NonZero::new(1).unwrap()));
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
    = help: this means these two types are not *guaranteed* to be ABI-compatible across all targets
    = help: if you think this code should be accepted anyway, please report an issue with Miri
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_pointers/abi_mismatch_repr_C.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_pointers/abi_mismatch_return_type.stderr b/src/tools/miri/tests/fail/function_pointers/abi_mismatch_return_type.stderr
index 28c676ad4823..ba940902c8ce 100644
--- a/src/tools/miri/tests/fail/function_pointers/abi_mismatch_return_type.stderr
+++ b/src/tools/miri/tests/fail/function_pointers/abi_mismatch_return_type.stderr
@@ -8,8 +8,6 @@ LL |     g()
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
    = help: this means these two types are not *guaranteed* to be ABI-compatible across all targets
    = help: if you think this code should be accepted anyway, please report an issue with Miri
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_pointers/abi_mismatch_return_type.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_pointers/abi_mismatch_simple.stderr b/src/tools/miri/tests/fail/function_pointers/abi_mismatch_simple.stderr
index 2ed9ac2e6dae..ab9c0e720304 100644
--- a/src/tools/miri/tests/fail/function_pointers/abi_mismatch_simple.stderr
+++ b/src/tools/miri/tests/fail/function_pointers/abi_mismatch_simple.stderr
@@ -8,8 +8,6 @@ LL |     g(42)
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
    = help: this means these two types are not *guaranteed* to be ABI-compatible across all targets
    = help: if you think this code should be accepted anyway, please report an issue with Miri
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_pointers/abi_mismatch_simple.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_pointers/abi_mismatch_too_few_args.stderr b/src/tools/miri/tests/fail/function_pointers/abi_mismatch_too_few_args.stderr
index a03e596bba14..06e6ccbd7bf2 100644
--- a/src/tools/miri/tests/fail/function_pointers/abi_mismatch_too_few_args.stderr
+++ b/src/tools/miri/tests/fail/function_pointers/abi_mismatch_too_few_args.stderr
@@ -6,8 +6,6 @@ LL |     g()
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_pointers/abi_mismatch_too_few_args.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_pointers/abi_mismatch_too_many_args.stderr b/src/tools/miri/tests/fail/function_pointers/abi_mismatch_too_many_args.stderr
index eb681a10e43c..d343eb8f2599 100644
--- a/src/tools/miri/tests/fail/function_pointers/abi_mismatch_too_many_args.stderr
+++ b/src/tools/miri/tests/fail/function_pointers/abi_mismatch_too_many_args.stderr
@@ -6,8 +6,6 @@ LL |     g(42)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_pointers/abi_mismatch_too_many_args.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_pointers/abi_mismatch_vector.stderr b/src/tools/miri/tests/fail/function_pointers/abi_mismatch_vector.stderr
index b13e8d936dbe..1176589a5f4a 100644
--- a/src/tools/miri/tests/fail/function_pointers/abi_mismatch_vector.stderr
+++ b/src/tools/miri/tests/fail/function_pointers/abi_mismatch_vector.stderr
@@ -8,8 +8,6 @@ LL |     g(Default::default())
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
    = help: this means these two types are not *guaranteed* to be ABI-compatible across all targets
    = help: if you think this code should be accepted anyway, please report an issue with Miri
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_pointers/abi_mismatch_vector.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_pointers/cast_box_int_to_fn_ptr.stderr b/src/tools/miri/tests/fail/function_pointers/cast_box_int_to_fn_ptr.stderr
index 6330f17b2b26..c1a5faca3876 100644
--- a/src/tools/miri/tests/fail/function_pointers/cast_box_int_to_fn_ptr.stderr
+++ b/src/tools/miri/tests/fail/function_pointers/cast_box_int_to_fn_ptr.stderr
@@ -6,8 +6,6 @@ LL |     (*g)(42)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_pointers/cast_box_int_to_fn_ptr.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_pointers/cast_int_to_fn_ptr.stderr b/src/tools/miri/tests/fail/function_pointers/cast_int_to_fn_ptr.stderr
index de4c037a8b14..aed5aeead5a5 100644
--- a/src/tools/miri/tests/fail/function_pointers/cast_int_to_fn_ptr.stderr
+++ b/src/tools/miri/tests/fail/function_pointers/cast_int_to_fn_ptr.stderr
@@ -6,8 +6,6 @@ LL |     g(42)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_pointers/cast_int_to_fn_ptr.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_pointers/deref_fn_ptr.stderr b/src/tools/miri/tests/fail/function_pointers/deref_fn_ptr.stderr
index c9144aa52980..bff57c2785ce 100644
--- a/src/tools/miri/tests/fail/function_pointers/deref_fn_ptr.stderr
+++ b/src/tools/miri/tests/fail/function_pointers/deref_fn_ptr.stderr
@@ -6,8 +6,6 @@ LL |         *std::mem::transmute::<fn(), *const u8>(f)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_pointers/deref_fn_ptr.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_pointers/execute_memory.stderr b/src/tools/miri/tests/fail/function_pointers/execute_memory.stderr
index 52d03ae1733a..3f7b80412ae1 100644
--- a/src/tools/miri/tests/fail/function_pointers/execute_memory.stderr
+++ b/src/tools/miri/tests/fail/function_pointers/execute_memory.stderr
@@ -6,8 +6,6 @@ LL |         f()
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_pointers/execute_memory.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/function_pointers/fn_ptr_offset.stderr b/src/tools/miri/tests/fail/function_pointers/fn_ptr_offset.stderr
index f558251bea38..e22a5090243a 100644
--- a/src/tools/miri/tests/fail/function_pointers/fn_ptr_offset.stderr
+++ b/src/tools/miri/tests/fail/function_pointers/fn_ptr_offset.stderr
@@ -6,8 +6,6 @@ LL |     x();
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/function_pointers/fn_ptr_offset.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsic_fallback_is_spec.stderr b/src/tools/miri/tests/fail/intrinsic_fallback_is_spec.stderr
index a115aa2d5b58..2fc9a917022a 100644
--- a/src/tools/miri/tests/fail/intrinsic_fallback_is_spec.stderr
+++ b/src/tools/miri/tests/fail/intrinsic_fallback_is_spec.stderr
@@ -5,8 +5,6 @@ LL |     ptr_guaranteed_cmp::<()>(std::ptr::null(), std::ptr::null());
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unsupported operation occurred here
    |
    = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsic_fallback_is_spec.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/assume.stderr b/src/tools/miri/tests/fail/intrinsics/assume.stderr
index 3e7ad34f54e7..23bae791ec1c 100644
--- a/src/tools/miri/tests/fail/intrinsics/assume.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/assume.stderr
@@ -6,8 +6,6 @@ LL |         std::intrinsics::assume(x > 42);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/assume.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/copy_overflow.stderr b/src/tools/miri/tests/fail/intrinsics/copy_overflow.stderr
index 486b00c4d235..ac0005b9681d 100644
--- a/src/tools/miri/tests/fail/intrinsics/copy_overflow.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/copy_overflow.stderr
@@ -6,8 +6,6 @@ LL |         (&mut y as *mut i32).copy_from(&x, 1usize << (mem::size_of::<usize>
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/copy_overflow.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/copy_overlapping.stderr b/src/tools/miri/tests/fail/intrinsics/copy_overlapping.stderr
index aee22698fd19..70ff03fb1c20 100644
--- a/src/tools/miri/tests/fail/intrinsics/copy_overlapping.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/copy_overlapping.stderr
@@ -6,8 +6,6 @@ LL |         std::intrinsics::copy_nonoverlapping(a, b, 2);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/copy_overlapping.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/copy_unaligned.stderr b/src/tools/miri/tests/fail/intrinsics/copy_unaligned.stderr
index d9b41f5b0581..898df16f4bdf 100644
--- a/src/tools/miri/tests/fail/intrinsics/copy_unaligned.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/copy_unaligned.stderr
@@ -6,8 +6,6 @@ LL | ...   std::intrinsics::copy_nonoverlapping(&data[5], ptr, 0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/copy_unaligned.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/ctlz_nonzero.stderr b/src/tools/miri/tests/fail/intrinsics/ctlz_nonzero.stderr
index 2f766ba77437..d84d1ba5c667 100644
--- a/src/tools/miri/tests/fail/intrinsics/ctlz_nonzero.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/ctlz_nonzero.stderr
@@ -6,8 +6,6 @@ LL |         ctlz_nonzero(0u8);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/ctlz_nonzero.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/cttz_nonzero.stderr b/src/tools/miri/tests/fail/intrinsics/cttz_nonzero.stderr
index 66d0bac7302e..37127b93d8d0 100644
--- a/src/tools/miri/tests/fail/intrinsics/cttz_nonzero.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/cttz_nonzero.stderr
@@ -6,8 +6,6 @@ LL |         cttz_nonzero(0u8);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/cttz_nonzero.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/disjoint_bitor.stderr b/src/tools/miri/tests/fail/intrinsics/disjoint_bitor.stderr
index 80b27adfca8c..dbce619e47b0 100644
--- a/src/tools/miri/tests/fail/intrinsics/disjoint_bitor.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/disjoint_bitor.stderr
@@ -6,8 +6,6 @@ LL |     unsafe { std::intrinsics::disjoint_bitor(0b01101001_u8, 0b10001110) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/disjoint_bitor.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/div-by-zero.stderr b/src/tools/miri/tests/fail/intrinsics/div-by-zero.stderr
index ec83f4a96e94..40e97c01cf90 100644
--- a/src/tools/miri/tests/fail/intrinsics/div-by-zero.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/div-by-zero.stderr
@@ -6,8 +6,6 @@ LL |         let _n = unchecked_div(1i64, 0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/div-by-zero.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/exact_div1.stderr b/src/tools/miri/tests/fail/intrinsics/exact_div1.stderr
index c05dee7f6f5d..316bb6bc0a3e 100644
--- a/src/tools/miri/tests/fail/intrinsics/exact_div1.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/exact_div1.stderr
@@ -6,8 +6,6 @@ LL |     unsafe { std::intrinsics::exact_div(2, 0) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/exact_div1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/exact_div2.stderr b/src/tools/miri/tests/fail/intrinsics/exact_div2.stderr
index 349e30d7bfd2..7d37547f07a7 100644
--- a/src/tools/miri/tests/fail/intrinsics/exact_div2.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/exact_div2.stderr
@@ -6,8 +6,6 @@ LL |     unsafe { std::intrinsics::exact_div(2u16, 3) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/exact_div2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/exact_div3.stderr b/src/tools/miri/tests/fail/intrinsics/exact_div3.stderr
index e8292bbd4b47..1ce3cb21907a 100644
--- a/src/tools/miri/tests/fail/intrinsics/exact_div3.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/exact_div3.stderr
@@ -6,8 +6,6 @@ LL |     unsafe { std::intrinsics::exact_div(-19i8, 2) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/exact_div3.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/exact_div4.stderr b/src/tools/miri/tests/fail/intrinsics/exact_div4.stderr
index 9e6ccf599a1a..eb5674434b86 100644
--- a/src/tools/miri/tests/fail/intrinsics/exact_div4.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/exact_div4.stderr
@@ -6,8 +6,6 @@ LL |     unsafe { std::intrinsics::exact_div(i64::MIN, -1) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/exact_div4.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/fast_math_both.stderr b/src/tools/miri/tests/fail/intrinsics/fast_math_both.stderr
index c889dd01b85a..4b9e19cc0cbf 100644
--- a/src/tools/miri/tests/fail/intrinsics/fast_math_both.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/fast_math_both.stderr
@@ -6,8 +6,6 @@ LL | ...   let _x: f32 = core::intrinsics::fsub_fast(f32::NAN, f32::NAN);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/fast_math_both.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/fast_math_first.stderr b/src/tools/miri/tests/fail/intrinsics/fast_math_first.stderr
index e9c4f34ab37f..2971694076f1 100644
--- a/src/tools/miri/tests/fail/intrinsics/fast_math_first.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/fast_math_first.stderr
@@ -6,8 +6,6 @@ LL | ...   let _x: f32 = core::intrinsics::frem_fast(f32::NAN, 3.2);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/fast_math_first.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/fast_math_result.stderr b/src/tools/miri/tests/fail/intrinsics/fast_math_result.stderr
index cf7198c91fdf..5f2fb137f612 100644
--- a/src/tools/miri/tests/fail/intrinsics/fast_math_result.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/fast_math_result.stderr
@@ -6,8 +6,6 @@ LL |         let _x: f32 = core::intrinsics::fdiv_fast(1.0, 0.0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/fast_math_result.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/fast_math_second.stderr b/src/tools/miri/tests/fail/intrinsics/fast_math_second.stderr
index e1323b0b515a..350dad33e0e1 100644
--- a/src/tools/miri/tests/fail/intrinsics/fast_math_second.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/fast_math_second.stderr
@@ -6,8 +6,6 @@ LL | ...   let _x: f32 = core::intrinsics::fmul_fast(3.4f32, f32::INFINITY);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/fast_math_second.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/float_to_int_32_inf1.stderr b/src/tools/miri/tests/fail/intrinsics/float_to_int_32_inf1.stderr
index 5cce3fe85924..9cfa59086289 100644
--- a/src/tools/miri/tests/fail/intrinsics/float_to_int_32_inf1.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/float_to_int_32_inf1.stderr
@@ -6,8 +6,6 @@ LL |         float_to_int_unchecked::<f32, i32>(f32::INFINITY);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/float_to_int_32_inf1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/float_to_int_32_infneg1.stderr b/src/tools/miri/tests/fail/intrinsics/float_to_int_32_infneg1.stderr
index 49e804a82aee..acef357633c8 100644
--- a/src/tools/miri/tests/fail/intrinsics/float_to_int_32_infneg1.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/float_to_int_32_infneg1.stderr
@@ -6,8 +6,6 @@ LL |         float_to_int_unchecked::<f32, i32>(f32::NEG_INFINITY);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/float_to_int_32_infneg1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/float_to_int_32_nan.stderr b/src/tools/miri/tests/fail/intrinsics/float_to_int_32_nan.stderr
index b8cb2186eff2..0c4b312fd315 100644
--- a/src/tools/miri/tests/fail/intrinsics/float_to_int_32_nan.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/float_to_int_32_nan.stderr
@@ -6,8 +6,6 @@ LL |         float_to_int_unchecked::<f32, u32>(f32::NAN);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/float_to_int_32_nan.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/float_to_int_32_nanneg.stderr b/src/tools/miri/tests/fail/intrinsics/float_to_int_32_nanneg.stderr
index 4af308057b5e..5a10eaf6bf98 100644
--- a/src/tools/miri/tests/fail/intrinsics/float_to_int_32_nanneg.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/float_to_int_32_nanneg.stderr
@@ -6,8 +6,6 @@ LL |         float_to_int_unchecked::<f32, u32>(-f32::NAN);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/float_to_int_32_nanneg.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/float_to_int_32_neg.stderr b/src/tools/miri/tests/fail/intrinsics/float_to_int_32_neg.stderr
index efdee0814b80..c5bc84b62a7e 100644
--- a/src/tools/miri/tests/fail/intrinsics/float_to_int_32_neg.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/float_to_int_32_neg.stderr
@@ -6,8 +6,6 @@ LL |         float_to_int_unchecked::<f32, u32>(-1.000000001f32);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/float_to_int_32_neg.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/float_to_int_32_too_big1.stderr b/src/tools/miri/tests/fail/intrinsics/float_to_int_32_too_big1.stderr
index e5663a8a5f42..8ebfbc47df5d 100644
--- a/src/tools/miri/tests/fail/intrinsics/float_to_int_32_too_big1.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/float_to_int_32_too_big1.stderr
@@ -6,8 +6,6 @@ LL |         float_to_int_unchecked::<f32, i32>(2147483648.0f32);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/float_to_int_32_too_big1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/float_to_int_32_too_big2.stderr b/src/tools/miri/tests/fail/intrinsics/float_to_int_32_too_big2.stderr
index 2aab07cd8160..bdadfb4d88ce 100644
--- a/src/tools/miri/tests/fail/intrinsics/float_to_int_32_too_big2.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/float_to_int_32_too_big2.stderr
@@ -6,8 +6,6 @@ LL |         float_to_int_unchecked::<f32, u32>((u32::MAX - 127) as f32);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/float_to_int_32_too_big2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/float_to_int_32_too_small1.stderr b/src/tools/miri/tests/fail/intrinsics/float_to_int_32_too_small1.stderr
index dbd99d12c51e..7c18066ba907 100644
--- a/src/tools/miri/tests/fail/intrinsics/float_to_int_32_too_small1.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/float_to_int_32_too_small1.stderr
@@ -6,8 +6,6 @@ LL |         float_to_int_unchecked::<f32, i32>(-2147483904.0f32);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/float_to_int_32_too_small1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_inf1.stderr b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_inf1.stderr
index f3348d897196..fa4bd4c45ca8 100644
--- a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_inf1.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_inf1.stderr
@@ -6,8 +6,6 @@ LL |         float_to_int_unchecked::<f64, u128>(f64::INFINITY);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/float_to_int_64_inf1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_infneg1.stderr b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_infneg1.stderr
index b568408e53d3..f423431ebc93 100644
--- a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_infneg1.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_infneg1.stderr
@@ -6,8 +6,6 @@ LL |         float_to_int_unchecked::<f64, u128>(f64::NEG_INFINITY);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/float_to_int_64_infneg1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_infneg2.stderr b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_infneg2.stderr
index 5faa13409b07..112644abbc01 100644
--- a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_infneg2.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_infneg2.stderr
@@ -6,8 +6,6 @@ LL |         float_to_int_unchecked::<f64, i128>(f64::NEG_INFINITY);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/float_to_int_64_infneg2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_nan.stderr b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_nan.stderr
index ed0e15828022..c8e761308896 100644
--- a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_nan.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_nan.stderr
@@ -6,8 +6,6 @@ LL |         float_to_int_unchecked::<f64, u32>(f64::NAN);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/float_to_int_64_nan.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_neg.stderr b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_neg.stderr
index 754b5d514ce2..20d3fa4c39b2 100644
--- a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_neg.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_neg.stderr
@@ -6,8 +6,6 @@ LL |         float_to_int_unchecked::<f64, u128>(-1.0000000000001f64);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/float_to_int_64_neg.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big1.stderr b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big1.stderr
index 717475704f15..91c44eadd341 100644
--- a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big1.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big1.stderr
@@ -6,8 +6,6 @@ LL |         float_to_int_unchecked::<f64, i32>(2147483648.0f64);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/float_to_int_64_too_big1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big2.stderr b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big2.stderr
index 595f427b5121..43dc95132483 100644
--- a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big2.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big2.stderr
@@ -6,8 +6,6 @@ LL |         float_to_int_unchecked::<f64, i64>(9223372036854775808.0f64);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/float_to_int_64_too_big2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big3.stderr b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big3.stderr
index 0e180869370c..4bbbb418074a 100644
--- a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big3.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big3.stderr
@@ -6,8 +6,6 @@ LL |         float_to_int_unchecked::<f64, u64>(18446744073709551616.0f64);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/float_to_int_64_too_big3.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big4.stderr b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big4.stderr
index 0dd317d4b773..00320fe1b3dd 100644
--- a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big4.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big4.stderr
@@ -6,8 +6,6 @@ LL |         float_to_int_unchecked::<f64, u128>(u128::MAX as f64);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/float_to_int_64_too_big4.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big5.stderr b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big5.stderr
index ac8a2a858894..f698048be5d8 100644
--- a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big5.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big5.stderr
@@ -6,8 +6,6 @@ LL | ...   float_to_int_unchecked::<f64, i128>(240282366920938463463374607431768
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/float_to_int_64_too_big5.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big6.stderr b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big6.stderr
index e6e4618c13de..7f80e6f1a4d9 100644
--- a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big6.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big6.stderr
@@ -6,8 +6,6 @@ LL |         float_to_int_unchecked::<f64, u128>(f64::MAX);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/float_to_int_64_too_big6.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big7.stderr b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big7.stderr
index b82a7f1a4c71..99c6e9f8a4ea 100644
--- a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big7.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_big7.stderr
@@ -6,8 +6,6 @@ LL |         float_to_int_unchecked::<f64, i128>(f64::MIN);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/float_to_int_64_too_big7.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_small1.stderr b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_small1.stderr
index 37b7cae320d7..4641e573edc7 100644
--- a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_small1.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_small1.stderr
@@ -6,8 +6,6 @@ LL |         float_to_int_unchecked::<f64, i32>(-2147483649.0f64);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/float_to_int_64_too_small1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_small2.stderr b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_small2.stderr
index 63050939ef9e..d2718d2bda6a 100644
--- a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_small2.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_small2.stderr
@@ -6,8 +6,6 @@ LL |         float_to_int_unchecked::<f64, i64>(-9223372036854777856.0f64);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/float_to_int_64_too_small2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_small3.stderr b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_small3.stderr
index c3776e221e8f..f91544de7cc9 100644
--- a/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_small3.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/float_to_int_64_too_small3.stderr
@@ -6,8 +6,6 @@ LL | ...   float_to_int_unchecked::<f64, i128>(-24028236692093846346337460743176
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/float_to_int_64_too_small3.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/funnel_shl.stderr b/src/tools/miri/tests/fail/intrinsics/funnel_shl.stderr
index fc828021b132..900203d1b9b3 100644
--- a/src/tools/miri/tests/fail/intrinsics/funnel_shl.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/funnel_shl.stderr
@@ -6,8 +6,6 @@ LL |         std::intrinsics::unchecked_funnel_shl(1_u32, 2, 32);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/funnel_shl.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/funnel_shr.stderr b/src/tools/miri/tests/fail/intrinsics/funnel_shr.stderr
index 7361df1b4c7a..2b2e85f9f9b7 100644
--- a/src/tools/miri/tests/fail/intrinsics/funnel_shr.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/funnel_shr.stderr
@@ -6,8 +6,6 @@ LL |         std::intrinsics::unchecked_funnel_shr(1_u32, 2, 32);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/funnel_shr.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/intrinsic_target_feature.stderr b/src/tools/miri/tests/fail/intrinsics/intrinsic_target_feature.stderr
index 11c3c85be9ce..6742bd6e1adf 100644
--- a/src/tools/miri/tests/fail/intrinsics/intrinsic_target_feature.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/intrinsic_target_feature.stderr
@@ -6,8 +6,6 @@ LL |         dpps(_mm_setzero_ps(), _mm_setzero_ps(), 0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/intrinsic_target_feature.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/ptr_metadata_uninit_slice_len.stderr b/src/tools/miri/tests/fail/intrinsics/ptr_metadata_uninit_slice_len.stderr
index 80b4c8bec0d7..d284a6f6d019 100644
--- a/src/tools/miri/tests/fail/intrinsics/ptr_metadata_uninit_slice_len.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/ptr_metadata_uninit_slice_len.stderr
@@ -9,8 +9,6 @@ LL |         (*p.as_mut_ptr().cast::<[*const i32; 2]>())[0] = 4 as *const i32;
    = help: to ensure that Miri does not miss bugs in your program, use Strict Provenance APIs (https://doc.rust-lang.org/nightly/std/ptr/index.html#strict-provenance, https://crates.io/crates/sptr) instead
    = help: you can then set `MIRIFLAGS=-Zmiri-strict-provenance` to ensure you are not relying on `with_exposed_provenance` semantics
    = help: alternatively, `MIRIFLAGS=-Zmiri-permissive-provenance` disables this warning
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/ptr_metadata_uninit_slice_len.rs:LL:CC
 
 error: Undefined Behavior: reading memory at ALLOC[0xX..0xY], but memory is uninitialized at [0xX..0xY], and this operation requires initialized memory
   --> tests/fail/intrinsics/ptr_metadata_uninit_slice_len.rs:LL:CC
diff --git a/src/tools/miri/tests/fail/intrinsics/ptr_offset_from_different_allocs.stderr b/src/tools/miri/tests/fail/intrinsics/ptr_offset_from_different_allocs.stderr
index 4922afc8d102..8e276ed357d8 100644
--- a/src/tools/miri/tests/fail/intrinsics/ptr_offset_from_different_allocs.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/ptr_offset_from_different_allocs.stderr
@@ -6,8 +6,6 @@ LL |         (&1_u8 as *const u8).offset_from(&2_u8);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/ptr_offset_from_different_allocs.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/ptr_offset_from_different_ints.stderr b/src/tools/miri/tests/fail/intrinsics/ptr_offset_from_different_ints.stderr
index 41567e7ec991..b583e1aa9a62 100644
--- a/src/tools/miri/tests/fail/intrinsics/ptr_offset_from_different_ints.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/ptr_offset_from_different_ints.stderr
@@ -6,8 +6,6 @@ LL |         let _ = p1.byte_offset_from(p2);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/ptr_offset_from_different_ints.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/ptr_offset_from_oob.stderr b/src/tools/miri/tests/fail/intrinsics/ptr_offset_from_oob.stderr
index f380416af697..3c480ac8eb5a 100644
--- a/src/tools/miri/tests/fail/intrinsics/ptr_offset_from_oob.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/ptr_offset_from_oob.stderr
@@ -6,8 +6,6 @@ LL |         ptr.wrapping_add(4).offset_from(ptr);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/ptr_offset_from_oob.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/ptr_offset_from_unsigned_neg.stderr b/src/tools/miri/tests/fail/intrinsics/ptr_offset_from_unsigned_neg.stderr
index a74c697df41e..317dbcc0bdaf 100644
--- a/src/tools/miri/tests/fail/intrinsics/ptr_offset_from_unsigned_neg.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/ptr_offset_from_unsigned_neg.stderr
@@ -6,8 +6,6 @@ LL |     let _val = unsafe { ptr1.offset_from_unsigned(ptr2) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/ptr_offset_from_unsigned_neg.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/ptr_offset_int_plus_int.stderr b/src/tools/miri/tests/fail/intrinsics/ptr_offset_int_plus_int.stderr
index 6e49617839ba..d7de6f307c97 100644
--- a/src/tools/miri/tests/fail/intrinsics/ptr_offset_int_plus_int.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/ptr_offset_int_plus_int.stderr
@@ -6,8 +6,6 @@ LL |         let _val = (1 as *mut u8).offset(1);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/ptr_offset_int_plus_int.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/ptr_offset_int_plus_ptr.stderr b/src/tools/miri/tests/fail/intrinsics/ptr_offset_int_plus_ptr.stderr
index ace3d61499fd..b953208d4cc5 100644
--- a/src/tools/miri/tests/fail/intrinsics/ptr_offset_int_plus_ptr.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/ptr_offset_int_plus_ptr.stderr
@@ -6,8 +6,6 @@ LL |         let _val = (1 as *mut u8).offset(ptr as isize);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/ptr_offset_int_plus_ptr.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/ptr_offset_out_of_bounds.stderr b/src/tools/miri/tests/fail/intrinsics/ptr_offset_out_of_bounds.stderr
index b2039a792e91..d9a7967c6b7a 100644
--- a/src/tools/miri/tests/fail/intrinsics/ptr_offset_out_of_bounds.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/ptr_offset_out_of_bounds.stderr
@@ -11,8 +11,6 @@ help: ALLOC was allocated here:
    |
 LL |     let v = [0i8; 4];
    |         ^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/intrinsics/ptr_offset_out_of_bounds.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/ptr_offset_out_of_bounds_neg.stderr b/src/tools/miri/tests/fail/intrinsics/ptr_offset_out_of_bounds_neg.stderr
index f2e6f2b9e265..c7818784b5ff 100644
--- a/src/tools/miri/tests/fail/intrinsics/ptr_offset_out_of_bounds_neg.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/ptr_offset_out_of_bounds_neg.stderr
@@ -11,8 +11,6 @@ help: ALLOC was allocated here:
    |
 LL |     let v = [0i8; 4];
    |         ^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/intrinsics/ptr_offset_out_of_bounds_neg.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/ptr_offset_out_of_bounds_neg2.stderr b/src/tools/miri/tests/fail/intrinsics/ptr_offset_out_of_bounds_neg2.stderr
index 495aaf8d40ee..dbbfe2454a38 100644
--- a/src/tools/miri/tests/fail/intrinsics/ptr_offset_out_of_bounds_neg2.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/ptr_offset_out_of_bounds_neg2.stderr
@@ -11,8 +11,6 @@ help: ALLOC was allocated here:
    |
 LL |     let v = [0i8; 4];
    |         ^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/intrinsics/ptr_offset_out_of_bounds_neg2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/ptr_offset_overflow.stderr b/src/tools/miri/tests/fail/intrinsics/ptr_offset_overflow.stderr
index 741dd91b3551..aab7aa6f8786 100644
--- a/src/tools/miri/tests/fail/intrinsics/ptr_offset_overflow.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/ptr_offset_overflow.stderr
@@ -11,8 +11,6 @@ help: ALLOC was allocated here:
    |
 LL |     let v = [0i8; 4];
    |         ^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/intrinsics/ptr_offset_overflow.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/ptr_offset_unsigned_overflow.stderr b/src/tools/miri/tests/fail/intrinsics/ptr_offset_unsigned_overflow.stderr
index eb00c369f993..1e6ac17aaf7d 100644
--- a/src/tools/miri/tests/fail/intrinsics/ptr_offset_unsigned_overflow.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/ptr_offset_unsigned_overflow.stderr
@@ -6,8 +6,6 @@ LL |     let _ = unsafe { x.byte_add(usize::MAX) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/ptr_offset_unsigned_overflow.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/rem-by-zero.stderr b/src/tools/miri/tests/fail/intrinsics/rem-by-zero.stderr
index 1864efbfee58..ff52290a50a6 100644
--- a/src/tools/miri/tests/fail/intrinsics/rem-by-zero.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/rem-by-zero.stderr
@@ -6,8 +6,6 @@ LL |         let _n = unchecked_rem(3u32, 0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/rem-by-zero.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/simd-div-by-zero.stderr b/src/tools/miri/tests/fail/intrinsics/simd-div-by-zero.stderr
index 7bea17994686..abd32d26f916 100644
--- a/src/tools/miri/tests/fail/intrinsics/simd-div-by-zero.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/simd-div-by-zero.stderr
@@ -6,8 +6,6 @@ LL |         simd_div(x, y);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/simd-div-by-zero.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/simd-div-overflow.stderr b/src/tools/miri/tests/fail/intrinsics/simd-div-overflow.stderr
index 459212a91190..d3c2e353f0a5 100644
--- a/src/tools/miri/tests/fail/intrinsics/simd-div-overflow.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/simd-div-overflow.stderr
@@ -6,8 +6,6 @@ LL |         simd_div(x, y);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/simd-div-overflow.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/simd-extract.stderr b/src/tools/miri/tests/fail/intrinsics/simd-extract.stderr
index bd9dafb68645..c2bf4b01f3fc 100644
--- a/src/tools/miri/tests/fail/intrinsics/simd-extract.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/simd-extract.stderr
@@ -6,8 +6,6 @@ LL |     let _x: i32 = unsafe { std::intrinsics::simd::simd_extract(v, 4) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/simd-extract.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/simd-float-to-int.stderr b/src/tools/miri/tests/fail/intrinsics/simd-float-to-int.stderr
index 64b8e166c166..3e9a4fab03e7 100644
--- a/src/tools/miri/tests/fail/intrinsics/simd-float-to-int.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/simd-float-to-int.stderr
@@ -6,8 +6,6 @@ LL | ...   let _x: i32x2 = f32x2::from_array([f32::MAX, f32::MIN]).to_int_unchec
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/simd-float-to-int.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/simd-gather.stderr b/src/tools/miri/tests/fail/intrinsics/simd-gather.stderr
index d70f406e45bf..0b65bbc32d28 100644
--- a/src/tools/miri/tests/fail/intrinsics/simd-gather.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/simd-gather.stderr
@@ -6,8 +6,6 @@ LL |         let _result = Simd::gather_select_unchecked(&vec, Mask::splat(true)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/simd-gather.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/simd-reduce-invalid-bool.stderr b/src/tools/miri/tests/fail/intrinsics/simd-reduce-invalid-bool.stderr
index 0d8b96b79851..95c832b920e5 100644
--- a/src/tools/miri/tests/fail/intrinsics/simd-reduce-invalid-bool.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/simd-reduce-invalid-bool.stderr
@@ -6,8 +6,6 @@ LL |         simd_reduce_any(x);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/simd-reduce-invalid-bool.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/simd-rem-by-zero.stderr b/src/tools/miri/tests/fail/intrinsics/simd-rem-by-zero.stderr
index c58731fab8cb..77aabccdc053 100644
--- a/src/tools/miri/tests/fail/intrinsics/simd-rem-by-zero.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/simd-rem-by-zero.stderr
@@ -6,8 +6,6 @@ LL |         simd_rem(x, y);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/simd-rem-by-zero.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/simd-scatter.stderr b/src/tools/miri/tests/fail/intrinsics/simd-scatter.stderr
index 52032254aff5..4d1dcec3b576 100644
--- a/src/tools/miri/tests/fail/intrinsics/simd-scatter.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/simd-scatter.stderr
@@ -16,8 +16,6 @@ help: ALLOC was allocated here:
    |
 LL |         let mut vec: Vec<i8> = vec![10, 11, 12, 13, 14, 15, 16, 17, 18];
    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/intrinsics/simd-scatter.rs:LL:CC
    = note: this error originates in the macro `vec` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
diff --git a/src/tools/miri/tests/fail/intrinsics/simd-select-invalid-bool.stderr b/src/tools/miri/tests/fail/intrinsics/simd-select-invalid-bool.stderr
index 9a681173a17c..30f5f8218ea9 100644
--- a/src/tools/miri/tests/fail/intrinsics/simd-select-invalid-bool.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/simd-select-invalid-bool.stderr
@@ -6,8 +6,6 @@ LL |         simd_select(x, x, x);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/simd-select-invalid-bool.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/simd-shl-too-far.stderr b/src/tools/miri/tests/fail/intrinsics/simd-shl-too-far.stderr
index f1387e2c27f3..b1c3cfbc554e 100644
--- a/src/tools/miri/tests/fail/intrinsics/simd-shl-too-far.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/simd-shl-too-far.stderr
@@ -6,8 +6,6 @@ LL |         simd_shl(x, y);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/simd-shl-too-far.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/simd-shr-too-far.stderr b/src/tools/miri/tests/fail/intrinsics/simd-shr-too-far.stderr
index 3c14b7fb4a25..dd67b343b143 100644
--- a/src/tools/miri/tests/fail/intrinsics/simd-shr-too-far.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/simd-shr-too-far.stderr
@@ -6,8 +6,6 @@ LL |         simd_shr(x, y);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/simd-shr-too-far.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/typed-swap-overlap.stderr b/src/tools/miri/tests/fail/intrinsics/typed-swap-overlap.stderr
index fb50db74a205..5a848e53f3a7 100644
--- a/src/tools/miri/tests/fail/intrinsics/typed-swap-overlap.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/typed-swap-overlap.stderr
@@ -6,8 +6,6 @@ LL |         typed_swap_nonoverlapping(a, a);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/typed-swap-overlap.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/unchecked_add1.stderr b/src/tools/miri/tests/fail/intrinsics/unchecked_add1.stderr
index 649009cade96..45bd099246eb 100644
--- a/src/tools/miri/tests/fail/intrinsics/unchecked_add1.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/unchecked_add1.stderr
@@ -6,8 +6,6 @@ LL |     let _val = unsafe { 40000u16.unchecked_add(30000) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/unchecked_add1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/unchecked_add2.stderr b/src/tools/miri/tests/fail/intrinsics/unchecked_add2.stderr
index eec74a304ad5..e12be54df024 100644
--- a/src/tools/miri/tests/fail/intrinsics/unchecked_add2.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/unchecked_add2.stderr
@@ -6,8 +6,6 @@ LL |     let _val = unsafe { (-30000i16).unchecked_add(-8000) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/unchecked_add2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/unchecked_div1.stderr b/src/tools/miri/tests/fail/intrinsics/unchecked_div1.stderr
index 5f3422f19b3a..f39f39cd9350 100644
--- a/src/tools/miri/tests/fail/intrinsics/unchecked_div1.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/unchecked_div1.stderr
@@ -6,8 +6,6 @@ LL |         std::intrinsics::unchecked_div(i16::MIN, -1);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/unchecked_div1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/unchecked_mul1.stderr b/src/tools/miri/tests/fail/intrinsics/unchecked_mul1.stderr
index f9d5a4db9339..25b68aa5b096 100644
--- a/src/tools/miri/tests/fail/intrinsics/unchecked_mul1.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/unchecked_mul1.stderr
@@ -6,8 +6,6 @@ LL |     let _val = unsafe { 300u16.unchecked_mul(250u16) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/unchecked_mul1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/unchecked_mul2.stderr b/src/tools/miri/tests/fail/intrinsics/unchecked_mul2.stderr
index a2c19043f926..da7f87bed14f 100644
--- a/src/tools/miri/tests/fail/intrinsics/unchecked_mul2.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/unchecked_mul2.stderr
@@ -6,8 +6,6 @@ LL |     let _val = unsafe { 1_000_000_000i32.unchecked_mul(-4) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/unchecked_mul2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/unchecked_shl.stderr b/src/tools/miri/tests/fail/intrinsics/unchecked_shl.stderr
index 94d0bc0d111a..3cb6203265d0 100644
--- a/src/tools/miri/tests/fail/intrinsics/unchecked_shl.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/unchecked_shl.stderr
@@ -6,8 +6,6 @@ LL |         let _n = 1i8.unchecked_shl(8);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/unchecked_shl.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/unchecked_shl2.stderr b/src/tools/miri/tests/fail/intrinsics/unchecked_shl2.stderr
index 8c79a1980b77..2a8389087ffd 100644
--- a/src/tools/miri/tests/fail/intrinsics/unchecked_shl2.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/unchecked_shl2.stderr
@@ -6,8 +6,6 @@ LL |         let _n = intrinsics::unchecked_shl(1i8, -1);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/unchecked_shl2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/unchecked_shr.stderr b/src/tools/miri/tests/fail/intrinsics/unchecked_shr.stderr
index 4067437bf0fa..1f7eb120d974 100644
--- a/src/tools/miri/tests/fail/intrinsics/unchecked_shr.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/unchecked_shr.stderr
@@ -6,8 +6,6 @@ LL |         let _n = 1i64.unchecked_shr(64);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/unchecked_shr.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/unchecked_sub1.stderr b/src/tools/miri/tests/fail/intrinsics/unchecked_sub1.stderr
index b5914137a1c0..a9b4b23896ff 100644
--- a/src/tools/miri/tests/fail/intrinsics/unchecked_sub1.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/unchecked_sub1.stderr
@@ -6,8 +6,6 @@ LL |     let _val = unsafe { 14u32.unchecked_sub(22) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/unchecked_sub1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/unchecked_sub2.stderr b/src/tools/miri/tests/fail/intrinsics/unchecked_sub2.stderr
index 34227ddc051e..c03683349062 100644
--- a/src/tools/miri/tests/fail/intrinsics/unchecked_sub2.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/unchecked_sub2.stderr
@@ -6,8 +6,6 @@ LL |     let _val = unsafe { 30000i16.unchecked_sub(-7000) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/unchecked_sub2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/uninit_uninhabited_type.stderr b/src/tools/miri/tests/fail/intrinsics/uninit_uninhabited_type.stderr
index 36642208afea..d0f7cc1eacc2 100644
--- a/src/tools/miri/tests/fail/intrinsics/uninit_uninhabited_type.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/uninit_uninhabited_type.stderr
@@ -6,8 +6,6 @@ LL |     let _ = unsafe { std::mem::uninitialized::<!>() };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/uninit_uninhabited_type.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/write_bytes_overflow.stderr b/src/tools/miri/tests/fail/intrinsics/write_bytes_overflow.stderr
index e8c23463e86c..d89adaf5fce3 100644
--- a/src/tools/miri/tests/fail/intrinsics/write_bytes_overflow.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/write_bytes_overflow.stderr
@@ -6,8 +6,6 @@ LL |         (&mut y as *mut i32).write_bytes(0u8, 1usize << (mem::size_of::<usi
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/write_bytes_overflow.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/intrinsics/zero_fn_ptr.stderr b/src/tools/miri/tests/fail/intrinsics/zero_fn_ptr.stderr
index 53f3f8d1404a..1646721e2eba 100644
--- a/src/tools/miri/tests/fail/intrinsics/zero_fn_ptr.stderr
+++ b/src/tools/miri/tests/fail/intrinsics/zero_fn_ptr.stderr
@@ -6,8 +6,6 @@ LL |     let _ = unsafe { std::mem::zeroed::<fn()>() };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/intrinsics/zero_fn_ptr.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/issue-miri-3288-ice-symbolic-alignment-extern-static.stderr b/src/tools/miri/tests/fail/issue-miri-3288-ice-symbolic-alignment-extern-static.stderr
index 3d62d02559dd..2ee8e2898ed7 100644
--- a/src/tools/miri/tests/fail/issue-miri-3288-ice-symbolic-alignment-extern-static.stderr
+++ b/src/tools/miri/tests/fail/issue-miri-3288-ice-symbolic-alignment-extern-static.stderr
@@ -5,8 +5,6 @@ LL |     let _val = *DISPATCH_QUEUE_CONCURRENT;
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^ unsupported operation occurred here
    |
    = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/issue-miri-3288-ice-symbolic-alignment-extern-static.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/memleak.stderr b/src/tools/miri/tests/fail/memleak.stderr
index 89db0f1eb162..73ccb49c2a53 100644
--- a/src/tools/miri/tests/fail/memleak.stderr
+++ b/src/tools/miri/tests/fail/memleak.stderr
@@ -3,9 +3,6 @@ error: memory leaked: ALLOC (Rust heap, size: 4, align: 4), allocated here:
    |
 LL |     std::mem::forget(Box::new(42));
    |                      ^^^^^^^^^^^^
-   |
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/memleak.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/modifying_constants.stderr b/src/tools/miri/tests/fail/modifying_constants.stderr
index 80026a81a571..5a84a5a2eadd 100644
--- a/src/tools/miri/tests/fail/modifying_constants.stderr
+++ b/src/tools/miri/tests/fail/modifying_constants.stderr
@@ -6,8 +6,6 @@ LL |     *y = 42;
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/modifying_constants.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/never_match_never.stderr b/src/tools/miri/tests/fail/never_match_never.stderr
index c29a4f6b2d10..07073b9ae8f9 100644
--- a/src/tools/miri/tests/fail/never_match_never.stderr
+++ b/src/tools/miri/tests/fail/never_match_never.stderr
@@ -6,8 +6,6 @@ LL |     unsafe { match (*ptr).1 {} }
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/never_match_never.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/never_say_never.stderr b/src/tools/miri/tests/fail/never_say_never.stderr
index c8fefa462d3f..284fd4076003 100644
--- a/src/tools/miri/tests/fail/never_say_never.stderr
+++ b/src/tools/miri/tests/fail/never_say_never.stderr
@@ -6,8 +6,6 @@ LL |     f(x)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/never_say_never.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/never_transmute_humans.stderr b/src/tools/miri/tests/fail/never_transmute_humans.stderr
index 5c968dfbaead..66d1c8574e4c 100644
--- a/src/tools/miri/tests/fail/never_transmute_humans.stderr
+++ b/src/tools/miri/tests/fail/never_transmute_humans.stderr
@@ -6,8 +6,6 @@ LL |         std::mem::transmute::<Human, !>(Human)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/never_transmute_humans.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/overlapping_assignment_aggregate.stderr b/src/tools/miri/tests/fail/overlapping_assignment_aggregate.stderr
index f2a6d326b718..0d2debccc8a6 100644
--- a/src/tools/miri/tests/fail/overlapping_assignment_aggregate.stderr
+++ b/src/tools/miri/tests/fail/overlapping_assignment_aggregate.stderr
@@ -6,8 +6,6 @@ LL |             _1 = (_1.0, );
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/overlapping_assignment_aggregate.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/panic/unwind_panic_abort.stderr b/src/tools/miri/tests/fail/panic/unwind_panic_abort.stderr
index 289cbb43bcff..a741bcad39de 100644
--- a/src/tools/miri/tests/fail/panic/unwind_panic_abort.stderr
+++ b/src/tools/miri/tests/fail/panic/unwind_panic_abort.stderr
@@ -6,8 +6,6 @@ LL |         miri_start_unwind(&mut 0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/panic/unwind_panic_abort.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/provenance/int_copy_looses_provenance0.stderr b/src/tools/miri/tests/fail/provenance/int_copy_looses_provenance0.stderr
index 97bda83d05a3..6f097c336d2c 100644
--- a/src/tools/miri/tests/fail/provenance/int_copy_looses_provenance0.stderr
+++ b/src/tools/miri/tests/fail/provenance/int_copy_looses_provenance0.stderr
@@ -6,8 +6,6 @@ LL |     let _val = unsafe { *ptr.read() };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/provenance/int_copy_looses_provenance0.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/provenance/int_copy_looses_provenance1.stderr b/src/tools/miri/tests/fail/provenance/int_copy_looses_provenance1.stderr
index a4d725f9ae11..f3d1d8c13dec 100644
--- a/src/tools/miri/tests/fail/provenance/int_copy_looses_provenance1.stderr
+++ b/src/tools/miri/tests/fail/provenance/int_copy_looses_provenance1.stderr
@@ -6,8 +6,6 @@ LL |     let _val = unsafe { *ptr.read() };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/provenance/int_copy_looses_provenance1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/provenance/int_copy_looses_provenance2.stderr b/src/tools/miri/tests/fail/provenance/int_copy_looses_provenance2.stderr
index f00eccf07195..837423292daa 100644
--- a/src/tools/miri/tests/fail/provenance/int_copy_looses_provenance2.stderr
+++ b/src/tools/miri/tests/fail/provenance/int_copy_looses_provenance2.stderr
@@ -6,8 +6,6 @@ LL |     let _val = unsafe { *ptr.read() };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/provenance/int_copy_looses_provenance2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/provenance/int_copy_looses_provenance3.stderr b/src/tools/miri/tests/fail/provenance/int_copy_looses_provenance3.stderr
index 432d869af9b3..db559f839e85 100644
--- a/src/tools/miri/tests/fail/provenance/int_copy_looses_provenance3.stderr
+++ b/src/tools/miri/tests/fail/provenance/int_copy_looses_provenance3.stderr
@@ -6,8 +6,6 @@ LL |     let _val = unsafe { *ptr };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/provenance/int_copy_looses_provenance3.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/provenance/mix-ptrs1.stderr b/src/tools/miri/tests/fail/provenance/mix-ptrs1.stderr
index 88d75135a763..92aeb6445b4f 100644
--- a/src/tools/miri/tests/fail/provenance/mix-ptrs1.stderr
+++ b/src/tools/miri/tests/fail/provenance/mix-ptrs1.stderr
@@ -6,8 +6,6 @@ LL |         assert_eq!(*strange_ptr.with_addr(ptr.addr()), 0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at RUSTLIB/core/src/macros/mod.rs:LL:CC
    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
diff --git a/src/tools/miri/tests/fail/provenance/mix-ptrs2.stderr b/src/tools/miri/tests/fail/provenance/mix-ptrs2.stderr
index 636378952ba5..e00e72a50c6b 100644
--- a/src/tools/miri/tests/fail/provenance/mix-ptrs2.stderr
+++ b/src/tools/miri/tests/fail/provenance/mix-ptrs2.stderr
@@ -6,8 +6,6 @@ LL |         assert_eq!(*ptr, 42);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at RUSTLIB/core/src/macros/mod.rs:LL:CC
    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
diff --git a/src/tools/miri/tests/fail/provenance/pointer_partial_overwrite.stderr b/src/tools/miri/tests/fail/provenance/pointer_partial_overwrite.stderr
index e1d990771f25..b0f9ffb45197 100644
--- a/src/tools/miri/tests/fail/provenance/pointer_partial_overwrite.stderr
+++ b/src/tools/miri/tests/fail/provenance/pointer_partial_overwrite.stderr
@@ -6,8 +6,6 @@ LL |     let x = *p;
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/provenance/pointer_partial_overwrite.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/provenance/ptr_copy_loses_partial_provenance0.stderr b/src/tools/miri/tests/fail/provenance/ptr_copy_loses_partial_provenance0.stderr
index 0c97c990f92a..1f3fcab1729f 100644
--- a/src/tools/miri/tests/fail/provenance/ptr_copy_loses_partial_provenance0.stderr
+++ b/src/tools/miri/tests/fail/provenance/ptr_copy_loses_partial_provenance0.stderr
@@ -6,8 +6,6 @@ LL |         let _val = *ptr;
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/provenance/ptr_copy_loses_partial_provenance0.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/provenance/ptr_copy_loses_partial_provenance1.stderr b/src/tools/miri/tests/fail/provenance/ptr_copy_loses_partial_provenance1.stderr
index c29cf2df8117..b634c403cca0 100644
--- a/src/tools/miri/tests/fail/provenance/ptr_copy_loses_partial_provenance1.stderr
+++ b/src/tools/miri/tests/fail/provenance/ptr_copy_loses_partial_provenance1.stderr
@@ -6,8 +6,6 @@ LL |         let _val = *ptr;
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/provenance/ptr_copy_loses_partial_provenance1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/provenance/ptr_int_unexposed.stderr b/src/tools/miri/tests/fail/provenance/ptr_int_unexposed.stderr
index 23c2fce84034..0068af956a5b 100644
--- a/src/tools/miri/tests/fail/provenance/ptr_int_unexposed.stderr
+++ b/src/tools/miri/tests/fail/provenance/ptr_int_unexposed.stderr
@@ -6,8 +6,6 @@ LL |     assert_eq!(unsafe { *ptr }, 3);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/provenance/ptr_int_unexposed.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/provenance/ptr_invalid.stderr b/src/tools/miri/tests/fail/provenance/ptr_invalid.stderr
index dffaf236bed4..bab14fe41b6e 100644
--- a/src/tools/miri/tests/fail/provenance/ptr_invalid.stderr
+++ b/src/tools/miri/tests/fail/provenance/ptr_invalid.stderr
@@ -6,8 +6,6 @@ LL |     let _val = unsafe { *xptr_invalid };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/provenance/ptr_invalid.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/provenance/ptr_invalid_offset.stderr b/src/tools/miri/tests/fail/provenance/ptr_invalid_offset.stderr
index fab5fe0f60cd..dbb3fdf773b4 100644
--- a/src/tools/miri/tests/fail/provenance/ptr_invalid_offset.stderr
+++ b/src/tools/miri/tests/fail/provenance/ptr_invalid_offset.stderr
@@ -6,8 +6,6 @@ LL |     let _ = unsafe { roundtrip.offset(1) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/provenance/ptr_invalid_offset.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/provenance/strict_provenance_cast.stderr b/src/tools/miri/tests/fail/provenance/strict_provenance_cast.stderr
index e203911c6677..b01bd5ce5a16 100644
--- a/src/tools/miri/tests/fail/provenance/strict_provenance_cast.stderr
+++ b/src/tools/miri/tests/fail/provenance/strict_provenance_cast.stderr
@@ -5,8 +5,6 @@ LL |     let _ptr = std::ptr::with_exposed_provenance::<i32>(addr);
    |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unsupported operation occurred here
    |
    = help: use Strict Provenance APIs (https://doc.rust-lang.org/nightly/std/ptr/index.html#strict-provenance, https://crates.io/crates/sptr) instead
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/provenance/strict_provenance_cast.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/rc_as_ptr.stderr b/src/tools/miri/tests/fail/rc_as_ptr.stderr
index 5c6bda35af6c..d2d9d94afd44 100644
--- a/src/tools/miri/tests/fail/rc_as_ptr.stderr
+++ b/src/tools/miri/tests/fail/rc_as_ptr.stderr
@@ -16,8 +16,6 @@ help: ALLOC was deallocated here:
    |
 LL |     drop(strong);
    |     ^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at RUSTLIB/core/src/macros/mod.rs:LL:CC
    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
diff --git a/src/tools/miri/tests/fail/read_from_trivial_switch.stderr b/src/tools/miri/tests/fail/read_from_trivial_switch.stderr
index 1dcc341b7e67..85817513bc39 100644
--- a/src/tools/miri/tests/fail/read_from_trivial_switch.stderr
+++ b/src/tools/miri/tests/fail/read_from_trivial_switch.stderr
@@ -6,8 +6,6 @@ LL |     let &(0 | _) = bad_ref;
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/read_from_trivial_switch.rs:LL:CC
 
 Uninitialized memory occurred at ALLOC[0xX..0xY], in this allocation:
 ALLOC DUMP
diff --git a/src/tools/miri/tests/fail/reading_half_a_pointer.stderr b/src/tools/miri/tests/fail/reading_half_a_pointer.stderr
index fe2bc6da2f83..6732987b79f5 100644
--- a/src/tools/miri/tests/fail/reading_half_a_pointer.stderr
+++ b/src/tools/miri/tests/fail/reading_half_a_pointer.stderr
@@ -6,8 +6,6 @@ LL |         let _val = *x;
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/reading_half_a_pointer.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-decl.stderr b/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-decl.stderr
index 266e941436d7..e50fd41617a8 100644
--- a/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-decl.stderr
+++ b/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-decl.stderr
@@ -6,8 +6,6 @@ LL | ...   miri_resolve_frame(*frame, 0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/shims/backtrace/bad-backtrace-decl.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-flags.stderr b/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-flags.stderr
index dd2b19003219..f0553cc04316 100644
--- a/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-flags.stderr
+++ b/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-flags.stderr
@@ -5,8 +5,6 @@ LL |         miri_get_backtrace(2, std::ptr::null_mut());
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unsupported operation occurred here
    |
    = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/shims/backtrace/bad-backtrace-flags.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-ptr.stderr b/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-ptr.stderr
index 2274b1098aa3..bb4615dd14b5 100644
--- a/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-ptr.stderr
+++ b/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-ptr.stderr
@@ -6,8 +6,6 @@ LL |         miri_resolve_frame(std::ptr::null_mut(), 0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/shims/backtrace/bad-backtrace-ptr.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-resolve-flags.stderr b/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-resolve-flags.stderr
index ba9ea5ce3a46..947c42397309 100644
--- a/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-resolve-flags.stderr
+++ b/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-resolve-flags.stderr
@@ -5,8 +5,6 @@ LL |         miri_resolve_frame(buf[0], 2);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unsupported operation occurred here
    |
    = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/shims/backtrace/bad-backtrace-resolve-flags.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-resolve-names-flags.stderr b/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-resolve-names-flags.stderr
index e0498586a037..de09300306be 100644
--- a/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-resolve-names-flags.stderr
+++ b/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-resolve-names-flags.stderr
@@ -5,8 +5,6 @@ LL | ...   miri_resolve_frame_names(buf[0], 2, std::ptr::null_mut(), std::ptr::n
    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unsupported operation occurred here
    |
    = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/shims/backtrace/bad-backtrace-resolve-names-flags.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-size-flags.stderr b/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-size-flags.stderr
index 5846fbb769f4..bf176fc016c3 100644
--- a/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-size-flags.stderr
+++ b/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-size-flags.stderr
@@ -5,8 +5,6 @@ LL |         miri_backtrace_size(2);
    |         ^^^^^^^^^^^^^^^^^^^^^^ unsupported operation occurred here
    |
    = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/shims/backtrace/bad-backtrace-size-flags.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/shims/ctor_wrong_ret_type.stderr b/src/tools/miri/tests/fail/shims/ctor_wrong_ret_type.stderr
index 664bfbd32db2..68c56044be88 100644
--- a/src/tools/miri/tests/fail/shims/ctor_wrong_ret_type.stderr
+++ b/src/tools/miri/tests/fail/shims/ctor_wrong_ret_type.stderr
@@ -6,7 +6,6 @@ error: Undefined Behavior: calling a function with return type i32 passing retur
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
    = help: this means these two types are not *guaranteed* to be ABI-compatible across all targets
    = help: if you think this code should be accepted anyway, please report an issue with Miri
-   = note: BACKTRACE:
 
 error: aborting due to 1 previous error
 
diff --git a/src/tools/miri/tests/fail/shims/input_arg_mismatch.stderr b/src/tools/miri/tests/fail/shims/input_arg_mismatch.stderr
index ec27fd5ebb8f..bb5468b56fc8 100644
--- a/src/tools/miri/tests/fail/shims/input_arg_mismatch.stderr
+++ b/src/tools/miri/tests/fail/shims/input_arg_mismatch.stderr
@@ -8,8 +8,6 @@ LL |         close(fd);
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
    = help: this means these two types are not *guaranteed* to be ABI-compatible across all targets
    = help: if you think this code should be accepted anyway, please report an issue with Miri
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/shims/input_arg_mismatch.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/shims/non_vararg_signature_mismatch.stderr b/src/tools/miri/tests/fail/shims/non_vararg_signature_mismatch.stderr
index e01ba235f896..510ffdf80cac 100644
--- a/src/tools/miri/tests/fail/shims/non_vararg_signature_mismatch.stderr
+++ b/src/tools/miri/tests/fail/shims/non_vararg_signature_mismatch.stderr
@@ -6,8 +6,6 @@ LL |         open(c_path.as_ptr(), /* value does not matter */ 0)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/shims/non_vararg_signature_mismatch.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/shims/return_type_mismatch.stderr b/src/tools/miri/tests/fail/shims/return_type_mismatch.stderr
index 18ff3067fa03..bf705d39a857 100644
--- a/src/tools/miri/tests/fail/shims/return_type_mismatch.stderr
+++ b/src/tools/miri/tests/fail/shims/return_type_mismatch.stderr
@@ -8,8 +8,6 @@ LL |         close(fd);
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
    = help: this means these two types are not *guaranteed* to be ABI-compatible across all targets
    = help: if you think this code should be accepted anyway, please report an issue with Miri
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/shims/return_type_mismatch.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/shims/shim_arg_size.stderr b/src/tools/miri/tests/fail/shims/shim_arg_size.stderr
index 688272df2632..08ce069486d4 100644
--- a/src/tools/miri/tests/fail/shims/shim_arg_size.stderr
+++ b/src/tools/miri/tests/fail/shims/shim_arg_size.stderr
@@ -6,8 +6,6 @@ LL |         memchr(std::ptr::null(), 0, 0);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/shims/shim_arg_size.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/shims/vararg_caller_signature_mismatch.stderr b/src/tools/miri/tests/fail/shims/vararg_caller_signature_mismatch.stderr
index a7b8be9b36d9..12c5a21909ab 100644
--- a/src/tools/miri/tests/fail/shims/vararg_caller_signature_mismatch.stderr
+++ b/src/tools/miri/tests/fail/shims/vararg_caller_signature_mismatch.stderr
@@ -6,8 +6,6 @@ LL |     let res = unsafe { pipe(fds.as_mut_ptr()) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/shims/vararg_caller_signature_mismatch.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/shims/wrong_fixed_arg_count.stderr b/src/tools/miri/tests/fail/shims/wrong_fixed_arg_count.stderr
index fcec61a9e7e2..2442f051c81c 100644
--- a/src/tools/miri/tests/fail/shims/wrong_fixed_arg_count.stderr
+++ b/src/tools/miri/tests/fail/shims/wrong_fixed_arg_count.stderr
@@ -6,8 +6,6 @@ LL |         open(c_path.as_ptr(), /* value does not matter */ 0)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/shims/wrong_fixed_arg_count.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/disable_mut_does_not_merge_srw.stderr b/src/tools/miri/tests/fail/stacked_borrows/disable_mut_does_not_merge_srw.stderr
index 7e9fb3f3c881..32725935a230 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/disable_mut_does_not_merge_srw.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/disable_mut_does_not_merge_srw.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a write access
    |
 LL |         *base = 1;
    |         ^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/disable_mut_does_not_merge_srw.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/exposed_only_ro.stderr b/src/tools/miri/tests/fail/stacked_borrows/exposed_only_ro.stderr
index 07662573f61c..bded2dcb8400 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/exposed_only_ro.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/exposed_only_ro.stderr
@@ -6,8 +6,6 @@ LL |     unsafe { *ptr = 0 };
    |
    = help: this indicates a potential bug in the program: it performed an invalid operation, but the Stacked Borrows rules it violated are still experimental
    = help: see https://github.com/rust-lang/unsafe-code-guidelines/blob/master/wip/stacked-borrows.md for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/stacked_borrows/exposed_only_ro.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/fnentry_invalidation.stderr b/src/tools/miri/tests/fail/stacked_borrows/fnentry_invalidation.stderr
index b4f82469a8b8..8e107e7f89a4 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/fnentry_invalidation.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/fnentry_invalidation.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a Unique function-ent
    |
 LL |     x.do_bad();
    |     ^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/fnentry_invalidation.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/fnentry_invalidation2.stderr b/src/tools/miri/tests/fail/stacked_borrows/fnentry_invalidation2.stderr
index ad24e0fa32dc..a1f8a36b00f9 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/fnentry_invalidation2.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/fnentry_invalidation2.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0xc] by a Unique function-ent
    |
 LL |     let _ = t.sli.as_mut_ptr();
    |             ^^^^^^^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/fnentry_invalidation2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/illegal_dealloc1.stderr b/src/tools/miri/tests/fail/stacked_borrows/illegal_dealloc1.stderr
index 4e547e567e81..c2ef0916c030 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/illegal_dealloc1.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/illegal_dealloc1.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x1] by a write access
    |
 LL |         ptr1.write(0);
    |         ^^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/illegal_deALLOC.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/illegal_read1.stderr b/src/tools/miri/tests/fail/stacked_borrows/illegal_read1.stderr
index ea9dc47460ae..99f152eb9acb 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/illegal_read1.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/illegal_read1.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a read access
    |
 LL |     let _val = unsafe { *xraw };
    |                         ^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/illegal_read1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/illegal_read2.stderr b/src/tools/miri/tests/fail/stacked_borrows/illegal_read2.stderr
index fec08275f107..0d959a5752b5 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/illegal_read2.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/illegal_read2.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a SharedReadOnly reta
    |
 LL |     let shr = unsafe { &*xraw };
    |                        ^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/illegal_read2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/illegal_read3.stderr b/src/tools/miri/tests/fail/stacked_borrows/illegal_read3.stderr
index 2ef951a6e9cd..6b3228bd9d93 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/illegal_read3.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/illegal_read3.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a read access
    |
 LL |     let _val = unsafe { *xref1.r };
    |                         ^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/illegal_read3.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/illegal_read4.stderr b/src/tools/miri/tests/fail/stacked_borrows/illegal_read4.stderr
index fdf5ae4297a0..73c3da8c09fe 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/illegal_read4.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/illegal_read4.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a read access
    |
 LL |     let _val = unsafe { *xraw }; // use the raw again, this invalidates xref2 *even* with the special read except for uniq refs
    |                         ^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/illegal_read4.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/illegal_read5.stderr b/src/tools/miri/tests/fail/stacked_borrows/illegal_read5.stderr
index f1514cf49063..8b3ab12484bb 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/illegal_read5.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/illegal_read5.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [$HEX..$HEX] by a read access
    |
 LL |     mem::forget(unsafe { ptr::read(xshr) }); // but after reading through the shared ref
    |                          ^^^^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/illegal_read5.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/illegal_read6.stderr b/src/tools/miri/tests/fail/stacked_borrows/illegal_read6.stderr
index 3deb458cf22a..8360abb71ec8 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/illegal_read6.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/illegal_read6.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a Unique retag
    |
 LL |         let x = &mut *x; // kill `raw`
    |                 ^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/illegal_read6.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/illegal_read7.stderr b/src/tools/miri/tests/fail/stacked_borrows/illegal_read7.stderr
index 0ed58cf775b8..c7e6901522e9 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/illegal_read7.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/illegal_read7.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a read access
    |
 LL |         let _val = ptr::read(raw);
    |                    ^^^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/illegal_read7.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/illegal_read8.stderr b/src/tools/miri/tests/fail/stacked_borrows/illegal_read8.stderr
index 7eb52d7ec3b0..be425bc8438e 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/illegal_read8.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/illegal_read8.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a write access
    |
 LL |         *y2 += 1;
    |         ^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/illegal_read8.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/illegal_read_despite_exposed1.stderr b/src/tools/miri/tests/fail/stacked_borrows/illegal_read_despite_exposed1.stderr
index 3c6dbf7fdce7..065e7395f8e2 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/illegal_read_despite_exposed1.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/illegal_read_despite_exposed1.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a write access
    |
 LL |         *exposed_ptr = 0;
    |         ^^^^^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/illegal_read_despite_exposed1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/illegal_read_despite_exposed2.stderr b/src/tools/miri/tests/fail/stacked_borrows/illegal_read_despite_exposed2.stderr
index 630fbd2fd14f..5643226463a7 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/illegal_read_despite_exposed2.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/illegal_read_despite_exposed2.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a read access
    |
 LL |         let _val = *exposed_ptr;
    |                    ^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/illegal_read_despite_exposed2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/illegal_write2.stderr b/src/tools/miri/tests/fail/stacked_borrows/illegal_write2.stderr
index 684e4ef19468..0d729dee4b8a 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/illegal_write2.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/illegal_write2.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a Unique retag
    |
 LL |     drop(&mut *target); // reborrow
    |          ^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/illegal_write2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/illegal_write3.stderr b/src/tools/miri/tests/fail/stacked_borrows/illegal_write3.stderr
index 431dc4443d23..ef850189ec6d 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/illegal_write3.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/illegal_write3.stderr
@@ -11,8 +11,6 @@ help: <TAG> was created by a SharedReadOnly retag at offsets [0x0..0x4]
    |
 LL |     let ptr = r#ref as *const _ as *mut _; // raw ptr, with raw tag
    |               ^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/illegal_write3.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/illegal_write4.stderr b/src/tools/miri/tests/fail/stacked_borrows/illegal_write4.stderr
index 954deeee77db..41470d76d6fa 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/illegal_write4.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/illegal_write4.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a Unique retag
    |
 LL |     let _mut_ref: &mut i32 = unsafe { mem::transmute(raw) }; // &mut, with raw tag
    |                                       ^^^^^^^^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/illegal_write4.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/illegal_write_despite_exposed1.stderr b/src/tools/miri/tests/fail/stacked_borrows/illegal_write_despite_exposed1.stderr
index 03597105e8ed..5ed9ab6da8b6 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/illegal_write_despite_exposed1.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/illegal_write_despite_exposed1.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a write access
    |
 LL |         *exposed_ptr = 0;
    |         ^^^^^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/illegal_write_despite_exposed1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/interior_mut1.stderr b/src/tools/miri/tests/fail/stacked_borrows/interior_mut1.stderr
index 76a320a819a9..f916a5f729e7 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/interior_mut1.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/interior_mut1.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a write access
    |
 LL |         *c.get() = UnsafeCell::new(1); // invalidates inner_shr
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/interior_mut1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/interior_mut2.stderr b/src/tools/miri/tests/fail/stacked_borrows/interior_mut2.stderr
index c7852d58b8e6..6f41d858cd19 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/interior_mut2.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/interior_mut2.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a write access
    |
 LL |         *c.get() = UnsafeCell::new(0); // now inner_shr gets invalidated
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/interior_mut2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/load_invalid_mut.stderr b/src/tools/miri/tests/fail/stacked_borrows/load_invalid_mut.stderr
index ff295c4bf846..7dc406158177 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/load_invalid_mut.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/load_invalid_mut.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a read access
    |
 LL |     let _val = unsafe { *xraw }; // invalidate xref
    |                         ^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/load_invalid_mut.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/pass_invalid_mut.stderr b/src/tools/miri/tests/fail/stacked_borrows/pass_invalid_mut.stderr
index 382343f18db4..2bf1f5faa562 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/pass_invalid_mut.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/pass_invalid_mut.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a read access
    |
 LL |     let _val = unsafe { *xraw }; // invalidate xref
    |                         ^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/pass_invalid_mut.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/raw_tracking.stderr b/src/tools/miri/tests/fail/stacked_borrows/raw_tracking.stderr
index 479bc87e99c5..aef24cddf2a9 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/raw_tracking.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/raw_tracking.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a Unique retag
    |
 LL |     let raw2 = &mut l as *mut _; // invalidates raw1
    |                ^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/raw_tracking.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/retag_data_race_protected_read.stderr b/src/tools/miri/tests/fail/stacked_borrows/retag_data_race_protected_read.stderr
index 561ce3164c30..5b8f77600cd2 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/retag_data_race_protected_read.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/retag_data_race_protected_read.stderr
@@ -14,8 +14,6 @@ LL |     unsafe { ptr.0.read() };
    = help: therefore from the perspective of data races, a retag has the same implications as a read or write
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/stacked_borrows/retag_data_race_protected_read.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/shared_rw_borrows_are_weak1.stderr b/src/tools/miri/tests/fail/stacked_borrows/shared_rw_borrows_are_weak1.stderr
index ebeb721b76f6..24265de1ea83 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/shared_rw_borrows_are_weak1.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/shared_rw_borrows_are_weak1.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a Unique retag
    |
 LL |         shr_rw.set(1);
    |         ^^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/shared_rw_borrows_are_weak1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/shared_rw_borrows_are_weak2.stderr b/src/tools/miri/tests/fail/stacked_borrows/shared_rw_borrows_are_weak2.stderr
index 79a3d391fccf..3b8aa2ee662b 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/shared_rw_borrows_are_weak2.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/shared_rw_borrows_are_weak2.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [$HEX..$HEX] by a Unique retag
    |
 LL |         shr_rw.replace(1);
    |         ^^^^^^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/shared_rw_borrows_are_weak2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/static_memory_modification.stderr b/src/tools/miri/tests/fail/stacked_borrows/static_memory_modification.stderr
index 8e517ad05edb..bca5daa73d70 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/static_memory_modification.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/static_memory_modification.stderr
@@ -6,8 +6,6 @@ LL |         std::mem::transmute::<&usize, &mut usize>(&X)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/stacked_borrows/static_memory_modification.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/track_caller.stderr b/src/tools/miri/tests/fail/stacked_borrows/track_caller.stderr
index 6cdaa2913ea2..c60ce8b5a9b6 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/track_caller.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/track_caller.stderr
@@ -16,8 +16,6 @@ help: <TAG> was later invalidated at offsets [0x0..0x4] by a read access
    |
 LL |     callee(xraw);
    |     ^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/track_caller.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/transmute-is-no-escape.stderr b/src/tools/miri/tests/fail/stacked_borrows/transmute-is-no-escape.stderr
index 9d454f2c1e6b..1aba064992c6 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/transmute-is-no-escape.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/transmute-is-no-escape.stderr
@@ -11,8 +11,6 @@ help: <TAG> was created by a SharedReadWrite retag at offsets [0x4..0x8]
    |
 LL |     let raw = (&mut x[1] as *mut i32).wrapping_offset(-1);
    |                ^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/transmute-is-no-escape.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/unescaped_local.stderr b/src/tools/miri/tests/fail/stacked_borrows/unescaped_local.stderr
index 0c78dcd7c887..5dd8f11bb94c 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/unescaped_local.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/unescaped_local.stderr
@@ -6,8 +6,6 @@ LL |         *raw = 13;
    |
    = help: this indicates a potential bug in the program: it performed an invalid operation, but the Stacked Borrows rules it violated are still experimental
    = help: see https://github.com/rust-lang/unsafe-code-guidelines/blob/master/wip/stacked-borrows.md for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/stacked_borrows/unescaped_local.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/unescaped_static.stderr b/src/tools/miri/tests/fail/stacked_borrows/unescaped_static.stderr
index 3efd6c32c932..7f3d1dfd411f 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/unescaped_static.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/unescaped_static.stderr
@@ -11,8 +11,6 @@ help: <TAG> was created by a SharedReadOnly retag at offsets [0x0..0x1]
    |
 LL |     let ptr_to_first = &ARRAY[0] as *const u8;
    |                        ^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/stacked_borrows/unescaped_static.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/zst_slice.stderr b/src/tools/miri/tests/fail/stacked_borrows/zst_slice.stderr
index 021f87839e86..91b320465624 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/zst_slice.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/zst_slice.stderr
@@ -11,8 +11,6 @@ help: <TAG> would have been created here, but this is a zero-size retag ([0x0..0
    |
 LL |         assert_eq!(*s.as_ptr().add(1), 2);
    |                     ^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at RUSTLIB/core/src/macros/mod.rs:LL:CC
    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
diff --git a/src/tools/miri/tests/fail/static_memory_modification1.stderr b/src/tools/miri/tests/fail/static_memory_modification1.stderr
index d4a2dca3c14a..239274e21368 100644
--- a/src/tools/miri/tests/fail/static_memory_modification1.stderr
+++ b/src/tools/miri/tests/fail/static_memory_modification1.stderr
@@ -6,8 +6,6 @@ LL |         *std::mem::transmute::<&usize, &mut usize>(&X) = 6;
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/static_memory_modification1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/static_memory_modification2.stderr b/src/tools/miri/tests/fail/static_memory_modification2.stderr
index 48483ce7b29e..323358601f14 100644
--- a/src/tools/miri/tests/fail/static_memory_modification2.stderr
+++ b/src/tools/miri/tests/fail/static_memory_modification2.stderr
@@ -6,8 +6,6 @@ LL |         transmute::<&[u8], &mut [u8]>(s.as_bytes())[4] = 42;
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/static_memory_modification2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/static_memory_modification3.stderr b/src/tools/miri/tests/fail/static_memory_modification3.stderr
index a94a600a08a4..ca1f85065aa0 100644
--- a/src/tools/miri/tests/fail/static_memory_modification3.stderr
+++ b/src/tools/miri/tests/fail/static_memory_modification3.stderr
@@ -6,8 +6,6 @@ LL |         transmute::<&[u8], &mut [u8]>(bs)[4] = 42;
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/static_memory_modification3.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/storage-live-dead-var.stderr b/src/tools/miri/tests/fail/storage-live-dead-var.stderr
index d196f6164644..d33bfd79e94e 100644
--- a/src/tools/miri/tests/fail/storage-live-dead-var.stderr
+++ b/src/tools/miri/tests/fail/storage-live-dead-var.stderr
@@ -6,8 +6,6 @@ LL |             val = 42;
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/storage-live-dead-var.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/storage-live-resets-var.stderr b/src/tools/miri/tests/fail/storage-live-resets-var.stderr
index 478123501ec2..b3dd4ea0e848 100644
--- a/src/tools/miri/tests/fail/storage-live-resets-var.stderr
+++ b/src/tools/miri/tests/fail/storage-live-resets-var.stderr
@@ -6,8 +6,6 @@ LL |             _val2 = val;
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/storage-live-resets-var.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/tail_calls/signature-mismatch-arg.stderr b/src/tools/miri/tests/fail/tail_calls/signature-mismatch-arg.stderr
index cabea5df85dd..f5eccaeba666 100644
--- a/src/tools/miri/tests/fail/tail_calls/signature-mismatch-arg.stderr
+++ b/src/tools/miri/tests/fail/tail_calls/signature-mismatch-arg.stderr
@@ -8,8 +8,6 @@ LL |     f(0);
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
    = help: this means these two types are not *guaranteed* to be ABI-compatible across all targets
    = help: if you think this code should be accepted anyway, please report an issue with Miri
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/tail_calls/signature-mismatch-arg.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/tls/tls_static_dealloc.stderr b/src/tools/miri/tests/fail/tls/tls_static_dealloc.stderr
index a1307b7b41a8..db113b6cf457 100644
--- a/src/tools/miri/tests/fail/tls/tls_static_dealloc.stderr
+++ b/src/tools/miri/tests/fail/tls/tls_static_dealloc.stderr
@@ -6,8 +6,6 @@ LL |         let _val = *dangling_ptr.0;
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/tls/tls_static_dealloc.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/tls_static_leak.stderr b/src/tools/miri/tests/fail/tls_static_leak.stderr
index 24306cca7ffd..8f59aa8a31db 100644
--- a/src/tools/miri/tests/fail/tls_static_leak.stderr
+++ b/src/tools/miri/tests/fail/tls_static_leak.stderr
@@ -3,9 +3,6 @@ error: memory leaked: ALLOC (Rust heap, size: 4, align: 4), allocated here:
    |
 LL |         TLS.set(Some(Box::leak(Box::new(123))));
    |                                ^^^^^^^^^^^^^
-   |
-   = note: BACKTRACE:
-   = note: inside closure at tests/fail/tls_static_leak.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/tree_borrows/alternate-read-write.stderr b/src/tools/miri/tests/fail/tree_borrows/alternate-read-write.stderr
index aff482abfa0c..391ed75f730e 100644
--- a/src/tools/miri/tests/fail/tree_borrows/alternate-read-write.stderr
+++ b/src/tools/miri/tests/fail/tree_borrows/alternate-read-write.stderr
@@ -24,8 +24,6 @@ help: the accessed tag <TAG> later transitioned to Frozen due to a foreign read
 LL |     let _val = *x;
    |                ^^
    = help: this transition corresponds to a loss of write permissions
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/tree_borrows/alternate-read-write.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/tree_borrows/cell-inside-struct.stderr b/src/tools/miri/tests/fail/tree_borrows/cell-inside-struct.stderr
index 5e43d174ed90..282dc19eea79 100644
--- a/src/tools/miri/tests/fail/tree_borrows/cell-inside-struct.stderr
+++ b/src/tools/miri/tests/fail/tree_borrows/cell-inside-struct.stderr
@@ -18,8 +18,6 @@ help: the accessed tag <TAG> was created here, in the initial state Cell
    |
 LL |         let a = &root;
    |                 ^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/tree_borrows/cell-inside-struct.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/tree_borrows/error-range.stderr b/src/tools/miri/tests/fail/tree_borrows/error-range.stderr
index 3dc120a20d23..df508317bc34 100644
--- a/src/tools/miri/tests/fail/tree_borrows/error-range.stderr
+++ b/src/tools/miri/tests/fail/tree_borrows/error-range.stderr
@@ -18,8 +18,6 @@ help: the accessed tag <TAG> later transitioned to Disabled due to a foreign wri
 LL |         data[5] = 1;
    |         ^^^^^^^^^^^
    = help: this transition corresponds to a loss of read permissions
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/tree_borrows/error-range.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/tree_borrows/fnentry_invalidation.stderr b/src/tools/miri/tests/fail/tree_borrows/fnentry_invalidation.stderr
index bfd6854514e5..54013b27dee3 100644
--- a/src/tools/miri/tests/fail/tree_borrows/fnentry_invalidation.stderr
+++ b/src/tools/miri/tests/fail/tree_borrows/fnentry_invalidation.stderr
@@ -24,8 +24,6 @@ help: the accessed tag <TAG> later transitioned to Frozen due to a reborrow (act
 LL |     x.do_bad();
    |     ^
    = help: this transition corresponds to a loss of write permissions
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/tree_borrows/fnentry_invalidation.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/tree_borrows/frozen-lazy-write-to-surrounding.stderr b/src/tools/miri/tests/fail/tree_borrows/frozen-lazy-write-to-surrounding.stderr
index e9800468c57a..4d6146499ee8 100644
--- a/src/tools/miri/tests/fail/tree_borrows/frozen-lazy-write-to-surrounding.stderr
+++ b/src/tools/miri/tests/fail/tree_borrows/frozen-lazy-write-to-surrounding.stderr
@@ -12,8 +12,6 @@ help: the accessed tag <TAG> was created here, in the initial state Frozen
    |
 LL |     let x = &pair.0;
    |             ^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/tree_borrows/frozen-lazy-write-to-surrounding.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/tree_borrows/parent_read_freezes_raw_mut.stderr b/src/tools/miri/tests/fail/tree_borrows/parent_read_freezes_raw_mut.stderr
index 7a713abcbc45..d0cd0088c0be 100644
--- a/src/tools/miri/tests/fail/tree_borrows/parent_read_freezes_raw_mut.stderr
+++ b/src/tools/miri/tests/fail/tree_borrows/parent_read_freezes_raw_mut.stderr
@@ -24,8 +24,6 @@ help: the accessed tag <TAG> later transitioned to Frozen due to a reborrow (act
 LL |         assert_eq!(root, 0); // Parent Read
    |         ^^^^^^^^^^^^^^^^^^^
    = help: this transition corresponds to a loss of write permissions
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/tree_borrows/parent_read_freezes_raw_mut.rs:LL:CC
    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
diff --git a/src/tools/miri/tests/fail/tree_borrows/protector-write-lazy.stderr b/src/tools/miri/tests/fail/tree_borrows/protector-write-lazy.stderr
index 7cebd7f32a0a..6ebc2dd40e29 100644
--- a/src/tools/miri/tests/fail/tree_borrows/protector-write-lazy.stderr
+++ b/src/tools/miri/tests/fail/tree_borrows/protector-write-lazy.stderr
@@ -18,8 +18,6 @@ help: the accessed tag <TAG> later transitioned to Disabled due to a protector r
 LL | }
    |  ^
    = help: this transition corresponds to a loss of read and write permissions
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/tree_borrows/protector-write-lazy.rs:LL:CC
    = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
diff --git a/src/tools/miri/tests/fail/tree_borrows/reservedim_spurious_write.with.stderr b/src/tools/miri/tests/fail/tree_borrows/reservedim_spurious_write.with.stderr
index 7565fa6203f9..15365e5c8bcc 100644
--- a/src/tools/miri/tests/fail/tree_borrows/reservedim_spurious_write.with.stderr
+++ b/src/tools/miri/tests/fail/tree_borrows/reservedim_spurious_write.with.stderr
@@ -32,8 +32,6 @@ help: the accessed tag <TAG> later transitioned to Disabled due to a foreign wri
 LL |                 *x = 64;
    |                 ^^^^^^^
    = help: this transition corresponds to a loss of read and write permissions
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/tree_borrows/reservedim_spurious_write.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/tree_borrows/reservedim_spurious_write.without.stderr b/src/tools/miri/tests/fail/tree_borrows/reservedim_spurious_write.without.stderr
index 7f791c88dde3..4065c822866c 100644
--- a/src/tools/miri/tests/fail/tree_borrows/reservedim_spurious_write.without.stderr
+++ b/src/tools/miri/tests/fail/tree_borrows/reservedim_spurious_write.without.stderr
@@ -32,8 +32,6 @@ help: the accessed tag <TAG> later transitioned to Disabled due to a protector r
 LL |         }
    |          ^
    = help: this transition corresponds to a loss of read and write permissions
-   = note: BACKTRACE (of the first span) on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/tree_borrows/reservedim_spurious_write.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/tree_borrows/return_invalid_mut.stderr b/src/tools/miri/tests/fail/tree_borrows/return_invalid_mut.stderr
index 4b6308847bb8..76ee412d71af 100644
--- a/src/tools/miri/tests/fail/tree_borrows/return_invalid_mut.stderr
+++ b/src/tools/miri/tests/fail/tree_borrows/return_invalid_mut.stderr
@@ -30,8 +30,6 @@ help: the conflicting tag <TAG> later transitioned to Frozen due to a foreign re
 LL |     let _val = unsafe { *xraw }; // invalidate xref for writing
    |                         ^^^^^
    = help: this transition corresponds to a loss of write permissions
-   = note: BACKTRACE (of the first span):
-   = note: inside `main` at tests/fail/tree_borrows/return_invalid_mut.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/type-too-large.stderr b/src/tools/miri/tests/fail/type-too-large.stderr
index 8c05f3a7e0bb..8f4e465fb529 100644
--- a/src/tools/miri/tests/fail/type-too-large.stderr
+++ b/src/tools/miri/tests/fail/type-too-large.stderr
@@ -3,9 +3,6 @@ error: post-monomorphization error: values of the type `[u8; 2305843011361177600
    |
 LL |     _fat = [0; (1u64 << 61) as usize + (1u64 << 31) as usize];
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ post-monomorphization error occurred here
-   |
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/type-too-large.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/unaligned_pointers/alignment.stderr b/src/tools/miri/tests/fail/unaligned_pointers/alignment.stderr
index bc344bbbf7e2..59850f9cdb7f 100644
--- a/src/tools/miri/tests/fail/unaligned_pointers/alignment.stderr
+++ b/src/tools/miri/tests/fail/unaligned_pointers/alignment.stderr
@@ -6,8 +6,6 @@ LL |         *(x_ptr as *mut u32) = 42; *(x_ptr.add(1) as *mut u32) = 42;
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/unaligned_pointers/alignment.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/unaligned_pointers/atomic_unaligned.stderr b/src/tools/miri/tests/fail/unaligned_pointers/atomic_unaligned.stderr
index a76d2f04f3f8..ac3b70fb3529 100644
--- a/src/tools/miri/tests/fail/unaligned_pointers/atomic_unaligned.stderr
+++ b/src/tools/miri/tests/fail/unaligned_pointers/atomic_unaligned.stderr
@@ -6,8 +6,6 @@ LL |         intrinsics::atomic_load::<_, { intrinsics::AtomicOrdering::SeqCst }
    |
    = help: this usually indicates that your program performed an invalid operation and caused Undefined Behavior
    = help: but due to `-Zmiri-symbolic-alignment-check`, alignment errors can also be false positives
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/unaligned_pointers/atomic_unaligned.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/unaligned_pointers/dyn_alignment.stderr b/src/tools/miri/tests/fail/unaligned_pointers/dyn_alignment.stderr
index ddd4641f7efb..0be5ef9ccf1b 100644
--- a/src/tools/miri/tests/fail/unaligned_pointers/dyn_alignment.stderr
+++ b/src/tools/miri/tests/fail/unaligned_pointers/dyn_alignment.stderr
@@ -6,8 +6,6 @@ LL |         let _ptr = &*ptr;
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/unaligned_pointers/dyn_alignment.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/unaligned_pointers/intptrcast_alignment_check.stderr b/src/tools/miri/tests/fail/unaligned_pointers/intptrcast_alignment_check.stderr
index 15fc1a768f95..1010da408c6d 100644
--- a/src/tools/miri/tests/fail/unaligned_pointers/intptrcast_alignment_check.stderr
+++ b/src/tools/miri/tests/fail/unaligned_pointers/intptrcast_alignment_check.stderr
@@ -6,8 +6,6 @@ LL |     unsafe { *u16_ptr = 2 };
    |
    = help: this usually indicates that your program performed an invalid operation and caused Undefined Behavior
    = help: but due to `-Zmiri-symbolic-alignment-check`, alignment errors can also be false positives
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/unaligned_pointers/intptrcast_alignment_check.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/unaligned_pointers/promise_alignment.call_unaligned_ptr.stderr b/src/tools/miri/tests/fail/unaligned_pointers/promise_alignment.call_unaligned_ptr.stderr
index 8d31f110ef41..5e7d6f5a5ded 100644
--- a/src/tools/miri/tests/fail/unaligned_pointers/promise_alignment.call_unaligned_ptr.stderr
+++ b/src/tools/miri/tests/fail/unaligned_pointers/promise_alignment.call_unaligned_ptr.stderr
@@ -5,8 +5,6 @@ LL |         unsafe { utils::miri_promise_symbolic_alignment(align8.add(1).cast(
    |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unsupported operation occurred here
    |
    = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/unaligned_pointers/promise_alignment.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/unaligned_pointers/promise_alignment.read_unaligned_ptr.stderr b/src/tools/miri/tests/fail/unaligned_pointers/promise_alignment.read_unaligned_ptr.stderr
index 85eec253a774..6bea0e34b648 100644
--- a/src/tools/miri/tests/fail/unaligned_pointers/promise_alignment.read_unaligned_ptr.stderr
+++ b/src/tools/miri/tests/fail/unaligned_pointers/promise_alignment.read_unaligned_ptr.stderr
@@ -6,8 +6,6 @@ LL |         let _val = unsafe { align8.cast::<Align16>().read() };
    |
    = help: this usually indicates that your program performed an invalid operation and caused Undefined Behavior
    = help: but due to `-Zmiri-symbolic-alignment-check`, alignment errors can also be false positives
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/unaligned_pointers/promise_alignment.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/unaligned_pointers/promise_alignment_zero.stderr b/src/tools/miri/tests/fail/unaligned_pointers/promise_alignment_zero.stderr
index 600e39907a2b..f50e94327e8c 100644
--- a/src/tools/miri/tests/fail/unaligned_pointers/promise_alignment_zero.stderr
+++ b/src/tools/miri/tests/fail/unaligned_pointers/promise_alignment_zero.stderr
@@ -5,8 +5,6 @@ LL |     unsafe { utils::miri_promise_symbolic_alignment(buffer.as_ptr().cast(),
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unsupported operation occurred here
    |
    = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/unaligned_pointers/promise_alignment_zero.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr1.stderr b/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr1.stderr
index ccf7f833a6be..07a653ae12bf 100644
--- a/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr1.stderr
+++ b/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr1.stderr
@@ -6,8 +6,6 @@ LL |         let _x = unsafe { *x };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/unaligned_pointers/unaligned_ptr1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr2.stderr b/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr2.stderr
index 99d26a78bf05..f0ae68aad62d 100644
--- a/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr2.stderr
+++ b/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr2.stderr
@@ -6,8 +6,6 @@ LL |     let _x = unsafe { *x };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/unaligned_pointers/unaligned_ptr2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr3.stderr b/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr3.stderr
index 7cdcc47455e4..9b9fbe576d4c 100644
--- a/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr3.stderr
+++ b/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr3.stderr
@@ -6,8 +6,6 @@ LL |         let _x = unsafe { *x };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/unaligned_pointers/unaligned_ptr3.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr4.stderr b/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr4.stderr
index 0d511c532f38..e0e788c90c22 100644
--- a/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr4.stderr
+++ b/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr4.stderr
@@ -6,8 +6,6 @@ LL |         let _val = unsafe { *ptr };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/unaligned_pointers/unaligned_ptr4.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr_zst.stderr b/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr_zst.stderr
index ebcaa460462a..d7d21c128562 100644
--- a/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr_zst.stderr
+++ b/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ptr_zst.stderr
@@ -6,8 +6,6 @@ LL |         let _x = unsafe { *x };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/unaligned_pointers/unaligned_ptr_zst.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ref_addr_of.stderr b/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ref_addr_of.stderr
index 86e7e73417ac..dfd6c143dfe4 100644
--- a/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ref_addr_of.stderr
+++ b/src/tools/miri/tests/fail/unaligned_pointers/unaligned_ref_addr_of.stderr
@@ -6,8 +6,6 @@ LL |         let _x = unsafe { &*x };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/unaligned_pointers/unaligned_ref_addr_of.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/uninit/padding-enum.stderr b/src/tools/miri/tests/fail/uninit/padding-enum.stderr
index 64229ac88172..56b209d51c91 100644
--- a/src/tools/miri/tests/fail/uninit/padding-enum.stderr
+++ b/src/tools/miri/tests/fail/uninit/padding-enum.stderr
@@ -6,8 +6,6 @@ LL |         let _val = *c.add(padding_offset);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/uninit/padding-enum.rs:LL:CC
 
 Uninitialized memory occurred at ALLOC[0xX..0xY], in this allocation:
 ALLOC DUMP
diff --git a/src/tools/miri/tests/fail/uninit/padding-pair.stderr b/src/tools/miri/tests/fail/uninit/padding-pair.stderr
index 2e7a577f204a..ef7cb41cc82a 100644
--- a/src/tools/miri/tests/fail/uninit/padding-pair.stderr
+++ b/src/tools/miri/tests/fail/uninit/padding-pair.stderr
@@ -6,8 +6,6 @@ LL |     let v = unsafe { *z.offset(first_undef) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/uninit/padding-pair.rs:LL:CC
 
 Uninitialized memory occurred at ALLOC[0xX..0xY], in this allocation:
 ALLOC DUMP
diff --git a/src/tools/miri/tests/fail/uninit/padding-struct-in-union.stderr b/src/tools/miri/tests/fail/uninit/padding-struct-in-union.stderr
index 87a423e46657..2b0dbd38e6ed 100644
--- a/src/tools/miri/tests/fail/uninit/padding-struct-in-union.stderr
+++ b/src/tools/miri/tests/fail/uninit/padding-struct-in-union.stderr
@@ -6,8 +6,6 @@ LL |     let _val = unsafe { (foobar.foo, foobar.bar) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/uninit/padding-struct-in-union.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/uninit/padding-struct.stderr b/src/tools/miri/tests/fail/uninit/padding-struct.stderr
index 05d754625d3f..5368f94e5665 100644
--- a/src/tools/miri/tests/fail/uninit/padding-struct.stderr
+++ b/src/tools/miri/tests/fail/uninit/padding-struct.stderr
@@ -6,8 +6,6 @@ LL |         let _val = *c.add(1);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/uninit/padding-struct.rs:LL:CC
 
 Uninitialized memory occurred at ALLOC[0x1..0x2], in this allocation:
 ALLOC (stack variable, size: 4, align: 2) {
diff --git a/src/tools/miri/tests/fail/uninit/padding-union.stderr b/src/tools/miri/tests/fail/uninit/padding-union.stderr
index fa07eedd8913..30d0862df39a 100644
--- a/src/tools/miri/tests/fail/uninit/padding-union.stderr
+++ b/src/tools/miri/tests/fail/uninit/padding-union.stderr
@@ -6,8 +6,6 @@ LL |         let _val = *c;
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/uninit/padding-union.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/uninit/padding-wide-ptr.stderr b/src/tools/miri/tests/fail/uninit/padding-wide-ptr.stderr
index ce11320ca1bf..0203b25d4241 100644
--- a/src/tools/miri/tests/fail/uninit/padding-wide-ptr.stderr
+++ b/src/tools/miri/tests/fail/uninit/padding-wide-ptr.stderr
@@ -6,8 +6,6 @@ LL |         let _val = *c.add(mem::size_of::<*const u8>());
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/uninit/padding-wide-ptr.rs:LL:CC
 
 Uninitialized memory occurred at ALLOC[0xX..0xY], in this allocation:
 ALLOC DUMP
diff --git a/src/tools/miri/tests/fail/uninit/transmute-pair-uninit.stderr b/src/tools/miri/tests/fail/uninit/transmute-pair-uninit.stderr
index eb049dd41ec2..adbae0840f47 100644
--- a/src/tools/miri/tests/fail/uninit/transmute-pair-uninit.stderr
+++ b/src/tools/miri/tests/fail/uninit/transmute-pair-uninit.stderr
@@ -6,8 +6,6 @@ LL |     let v = unsafe { *z.offset(first_undef) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/uninit/transmute-pair-uninit.rs:LL:CC
 
 Uninitialized memory occurred at ALLOC[0xX..0xY], in this allocation:
 ALLOC DUMP
diff --git a/src/tools/miri/tests/fail/uninit/uninit-after-aggregate-assign.stderr b/src/tools/miri/tests/fail/uninit/uninit-after-aggregate-assign.stderr
index 8086d375855e..e8deb5732a70 100644
--- a/src/tools/miri/tests/fail/uninit/uninit-after-aggregate-assign.stderr
+++ b/src/tools/miri/tests/fail/uninit/uninit-after-aggregate-assign.stderr
@@ -6,8 +6,6 @@ LL |             _val = *sptr2; // should hence be UB
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/uninit/uninit-after-aggregate-assign.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/uninit/uninit_byte_read.stderr b/src/tools/miri/tests/fail/uninit/uninit_byte_read.stderr
index 5a5aa12987c5..7827ed161aed 100644
--- a/src/tools/miri/tests/fail/uninit/uninit_byte_read.stderr
+++ b/src/tools/miri/tests/fail/uninit/uninit_byte_read.stderr
@@ -6,8 +6,6 @@ LL |     let undef = unsafe { *v.as_ptr().add(5) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/uninit/uninit_byte_read.rs:LL:CC
 
 Uninitialized memory occurred at ALLOC[0x5..0x6], in this allocation:
 ALLOC (Rust heap, size: 10, align: 1) {
diff --git a/src/tools/miri/tests/fail/unreachable.stderr b/src/tools/miri/tests/fail/unreachable.stderr
index 4b1820c9cef9..ab8ba4a68e5f 100644
--- a/src/tools/miri/tests/fail/unreachable.stderr
+++ b/src/tools/miri/tests/fail/unreachable.stderr
@@ -6,8 +6,6 @@ LL |     unsafe { std::hint::unreachable_unchecked() }
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/unreachable.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/unsupported_foreign_function.stderr b/src/tools/miri/tests/fail/unsupported_foreign_function.stderr
index 63467859ed2f..4ff9f2764902 100644
--- a/src/tools/miri/tests/fail/unsupported_foreign_function.stderr
+++ b/src/tools/miri/tests/fail/unsupported_foreign_function.stderr
@@ -5,8 +5,6 @@ LL |         foo();
    |         ^^^^^ unsupported operation occurred here
    |
    = help: this means the program tried to do something Miri does not support; it does not indicate a bug in the program
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/unsupported_foreign_function.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/box-custom-alloc-dangling-ptr.stderr b/src/tools/miri/tests/fail/validity/box-custom-alloc-dangling-ptr.stderr
index 36a318790418..b470e79232d5 100644
--- a/src/tools/miri/tests/fail/validity/box-custom-alloc-dangling-ptr.stderr
+++ b/src/tools/miri/tests/fail/validity/box-custom-alloc-dangling-ptr.stderr
@@ -6,8 +6,6 @@ LL |         std::mem::transmute(b)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/box-custom-alloc-dangling-ptr.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/box-custom-alloc-invalid-alloc.stderr b/src/tools/miri/tests/fail/validity/box-custom-alloc-invalid-alloc.stderr
index 42c4a6e851b8..d7594ab53b5d 100644
--- a/src/tools/miri/tests/fail/validity/box-custom-alloc-invalid-alloc.stderr
+++ b/src/tools/miri/tests/fail/validity/box-custom-alloc-invalid-alloc.stderr
@@ -6,8 +6,6 @@ LL |         std::mem::transmute(b)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/box-custom-alloc-invalid-alloc.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/cast_fn_ptr_invalid_callee_arg.stderr b/src/tools/miri/tests/fail/validity/cast_fn_ptr_invalid_callee_arg.stderr
index d2f75da47f1d..02e0ebe8abe6 100644
--- a/src/tools/miri/tests/fail/validity/cast_fn_ptr_invalid_callee_arg.stderr
+++ b/src/tools/miri/tests/fail/validity/cast_fn_ptr_invalid_callee_arg.stderr
@@ -6,8 +6,6 @@ LL |     g(0usize as *const i32)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/cast_fn_ptr_invalid_callee_arg.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/cast_fn_ptr_invalid_callee_ret.stderr b/src/tools/miri/tests/fail/validity/cast_fn_ptr_invalid_callee_ret.stderr
index efe89c0d220a..a00d167df2f7 100644
--- a/src/tools/miri/tests/fail/validity/cast_fn_ptr_invalid_callee_ret.stderr
+++ b/src/tools/miri/tests/fail/validity/cast_fn_ptr_invalid_callee_ret.stderr
@@ -6,8 +6,6 @@ LL |     f();
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/cast_fn_ptr_invalid_callee_ret.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/cast_fn_ptr_invalid_caller_ret.stderr b/src/tools/miri/tests/fail/validity/cast_fn_ptr_invalid_caller_ret.stderr
index e54d7105f17b..03d6637cdb61 100644
--- a/src/tools/miri/tests/fail/validity/cast_fn_ptr_invalid_caller_ret.stderr
+++ b/src/tools/miri/tests/fail/validity/cast_fn_ptr_invalid_caller_ret.stderr
@@ -6,8 +6,6 @@ LL |     let _x = g();
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/cast_fn_ptr_invalid_caller_ret.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/dangling_ref1.stderr b/src/tools/miri/tests/fail/validity/dangling_ref1.stderr
index b29826a9a3b9..05467c483f63 100644
--- a/src/tools/miri/tests/fail/validity/dangling_ref1.stderr
+++ b/src/tools/miri/tests/fail/validity/dangling_ref1.stderr
@@ -6,8 +6,6 @@ LL |     let _x: &i32 = unsafe { mem::transmute(16usize) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/dangling_ref1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/dangling_ref2.stderr b/src/tools/miri/tests/fail/validity/dangling_ref2.stderr
index b792fb5b944c..eb1b6e2c5804 100644
--- a/src/tools/miri/tests/fail/validity/dangling_ref2.stderr
+++ b/src/tools/miri/tests/fail/validity/dangling_ref2.stderr
@@ -6,8 +6,6 @@ LL |     let _x: &i32 = unsafe { mem::transmute(ptr) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/dangling_ref2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/dangling_ref3.stderr b/src/tools/miri/tests/fail/validity/dangling_ref3.stderr
index bcc4a796a872..ec2238c8618f 100644
--- a/src/tools/miri/tests/fail/validity/dangling_ref3.stderr
+++ b/src/tools/miri/tests/fail/validity/dangling_ref3.stderr
@@ -6,8 +6,6 @@ LL |     let _x: &i32 = unsafe { mem::transmute(dangling()) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/dangling_ref3.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/dyn-transmute-inner-binder.stderr b/src/tools/miri/tests/fail/validity/dyn-transmute-inner-binder.stderr
index 8a43534bc2d1..383c13cc2ab7 100644
--- a/src/tools/miri/tests/fail/validity/dyn-transmute-inner-binder.stderr
+++ b/src/tools/miri/tests/fail/validity/dyn-transmute-inner-binder.stderr
@@ -6,8 +6,6 @@ LL |     let y: &dyn Trait<for<'a> fn(&'a ())> = unsafe { std::mem::transmute(x)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/dyn-transmute-inner-binder.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/invalid_bool.stderr b/src/tools/miri/tests/fail/validity/invalid_bool.stderr
index 7135f545c520..b667449add68 100644
--- a/src/tools/miri/tests/fail/validity/invalid_bool.stderr
+++ b/src/tools/miri/tests/fail/validity/invalid_bool.stderr
@@ -6,8 +6,6 @@ LL |     let _b = unsafe { std::mem::transmute::<u8, bool>(2) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/invalid_bool.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/invalid_bool_op.stderr b/src/tools/miri/tests/fail/validity/invalid_bool_op.stderr
index faac61426bb9..e2d76c6b7776 100644
--- a/src/tools/miri/tests/fail/validity/invalid_bool_op.stderr
+++ b/src/tools/miri/tests/fail/validity/invalid_bool_op.stderr
@@ -6,8 +6,6 @@ LL |     let _x = b == std::hint::black_box(true);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/invalid_bool_op.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/invalid_bool_uninit.stderr b/src/tools/miri/tests/fail/validity/invalid_bool_uninit.stderr
index 089fd2303e39..800bc4fc3163 100644
--- a/src/tools/miri/tests/fail/validity/invalid_bool_uninit.stderr
+++ b/src/tools/miri/tests/fail/validity/invalid_bool_uninit.stderr
@@ -6,8 +6,6 @@ LL |     let _b = unsafe { MyUninit { init: () }.uninit };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/invalid_bool_uninit.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/invalid_char.stderr b/src/tools/miri/tests/fail/validity/invalid_char.stderr
index 720c09e692d2..7f579882bea0 100644
--- a/src/tools/miri/tests/fail/validity/invalid_char.stderr
+++ b/src/tools/miri/tests/fail/validity/invalid_char.stderr
@@ -6,8 +6,6 @@ LL |     let _val = match unsafe { std::mem::transmute::<i32, char>(-1) } {
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/invalid_char.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/invalid_char_op.stderr b/src/tools/miri/tests/fail/validity/invalid_char_op.stderr
index 692d57648619..081a7816300b 100644
--- a/src/tools/miri/tests/fail/validity/invalid_char_op.stderr
+++ b/src/tools/miri/tests/fail/validity/invalid_char_op.stderr
@@ -6,8 +6,6 @@ LL |     let _x = c == 'x';
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/invalid_char_op.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/invalid_char_uninit.stderr b/src/tools/miri/tests/fail/validity/invalid_char_uninit.stderr
index a4a61ed86a27..de8c1f39f248 100644
--- a/src/tools/miri/tests/fail/validity/invalid_char_uninit.stderr
+++ b/src/tools/miri/tests/fail/validity/invalid_char_uninit.stderr
@@ -6,8 +6,6 @@ LL |     let _b = unsafe { MyUninit { init: () }.uninit };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/invalid_char_uninit.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/invalid_enum_op.stderr b/src/tools/miri/tests/fail/validity/invalid_enum_op.stderr
index 3dd8f650d2e8..6481f3f9170e 100644
--- a/src/tools/miri/tests/fail/validity/invalid_enum_op.stderr
+++ b/src/tools/miri/tests/fail/validity/invalid_enum_op.stderr
@@ -6,8 +6,6 @@ LL |     let _val = mem::discriminant(&f);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/invalid_enum_op.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/invalid_enum_tag.stderr b/src/tools/miri/tests/fail/validity/invalid_enum_tag.stderr
index 3056643a1916..d7f299105205 100644
--- a/src/tools/miri/tests/fail/validity/invalid_enum_tag.stderr
+++ b/src/tools/miri/tests/fail/validity/invalid_enum_tag.stderr
@@ -6,8 +6,6 @@ LL |     let _f = unsafe { std::mem::transmute::<i32, Foo>(42) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/invalid_enum_tag.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/invalid_fnptr_null.stderr b/src/tools/miri/tests/fail/validity/invalid_fnptr_null.stderr
index 10cefa128650..20b2234e2ab2 100644
--- a/src/tools/miri/tests/fail/validity/invalid_fnptr_null.stderr
+++ b/src/tools/miri/tests/fail/validity/invalid_fnptr_null.stderr
@@ -6,8 +6,6 @@ LL |     let _b: fn() = unsafe { std::mem::transmute(0usize) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/invalid_fnptr_null.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/invalid_fnptr_uninit.stderr b/src/tools/miri/tests/fail/validity/invalid_fnptr_uninit.stderr
index 7e6fda25078c..513b90b5d85e 100644
--- a/src/tools/miri/tests/fail/validity/invalid_fnptr_uninit.stderr
+++ b/src/tools/miri/tests/fail/validity/invalid_fnptr_uninit.stderr
@@ -6,8 +6,6 @@ LL |     let _b = unsafe { MyUninit { init: () }.uninit };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/invalid_fnptr_uninit.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/invalid_int_op.stderr b/src/tools/miri/tests/fail/validity/invalid_int_op.stderr
index 0b1915621b24..046bbcb32f79 100644
--- a/src/tools/miri/tests/fail/validity/invalid_int_op.stderr
+++ b/src/tools/miri/tests/fail/validity/invalid_int_op.stderr
@@ -6,8 +6,6 @@ LL |     let i = unsafe { std::mem::MaybeUninit::<i32>::uninit().assume_init() }
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/invalid_int_op.rs:LL:CC
 
 Uninitialized memory occurred at ALLOC[0x0..0x4], in this allocation:
 ALLOC (stack variable, size: 4, align: 4) {
diff --git a/src/tools/miri/tests/fail/validity/invalid_wide_raw.stderr b/src/tools/miri/tests/fail/validity/invalid_wide_raw.stderr
index c41766ae845a..a3c7815cf282 100644
--- a/src/tools/miri/tests/fail/validity/invalid_wide_raw.stderr
+++ b/src/tools/miri/tests/fail/validity/invalid_wide_raw.stderr
@@ -6,8 +6,6 @@ LL |     dbg!(S { x: unsafe { std::mem::transmute((0usize, 0usize)) } });
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/invalid_wide_raw.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/match_binder_checks_validity1.stderr b/src/tools/miri/tests/fail/validity/match_binder_checks_validity1.stderr
index cde972ab6a2a..0ca8bc9f9bae 100644
--- a/src/tools/miri/tests/fail/validity/match_binder_checks_validity1.stderr
+++ b/src/tools/miri/tests/fail/validity/match_binder_checks_validity1.stderr
@@ -6,8 +6,6 @@ LL |             _x => println!("hi from the void!"),
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/match_binder_checks_validity1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/match_binder_checks_validity2.stderr b/src/tools/miri/tests/fail/validity/match_binder_checks_validity2.stderr
index 37625ace795f..281314e68d51 100644
--- a/src/tools/miri/tests/fail/validity/match_binder_checks_validity2.stderr
+++ b/src/tools/miri/tests/fail/validity/match_binder_checks_validity2.stderr
@@ -6,8 +6,6 @@ LL |             _x => println!("hi from the void!"),
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/match_binder_checks_validity2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/nonzero.stderr b/src/tools/miri/tests/fail/validity/nonzero.stderr
index 7be3ef46639c..e5fcdadb0d2c 100644
--- a/src/tools/miri/tests/fail/validity/nonzero.stderr
+++ b/src/tools/miri/tests/fail/validity/nonzero.stderr
@@ -6,8 +6,6 @@ LL |     let _x = Some(unsafe { NonZero(0) });
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/nonzero.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/recursive-validity-ref-bool.stderr b/src/tools/miri/tests/fail/validity/recursive-validity-ref-bool.stderr
index 05203802d84f..112072679ea5 100644
--- a/src/tools/miri/tests/fail/validity/recursive-validity-ref-bool.stderr
+++ b/src/tools/miri/tests/fail/validity/recursive-validity-ref-bool.stderr
@@ -6,8 +6,6 @@ LL |     let xref_wrong_type: &bool = unsafe { std::mem::transmute(xref) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/recursive-validity-ref-bool.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/ref_to_uninhabited1.stderr b/src/tools/miri/tests/fail/validity/ref_to_uninhabited1.stderr
index 6a7cbda5ef86..f1a059175566 100644
--- a/src/tools/miri/tests/fail/validity/ref_to_uninhabited1.stderr
+++ b/src/tools/miri/tests/fail/validity/ref_to_uninhabited1.stderr
@@ -6,8 +6,6 @@ LL |         let x: Box<!> = transmute(&mut 42);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/ref_to_uninhabited1.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/ref_to_uninhabited2.stderr b/src/tools/miri/tests/fail/validity/ref_to_uninhabited2.stderr
index 0cb126b2be33..4d25de46ade8 100644
--- a/src/tools/miri/tests/fail/validity/ref_to_uninhabited2.stderr
+++ b/src/tools/miri/tests/fail/validity/ref_to_uninhabited2.stderr
@@ -6,8 +6,6 @@ LL |         let _x: &(i32, Void) = transmute(&42);
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/ref_to_uninhabited2.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/too-big-slice.stderr b/src/tools/miri/tests/fail/validity/too-big-slice.stderr
index 3405cafc645a..9d4c34748660 100644
--- a/src/tools/miri/tests/fail/validity/too-big-slice.stderr
+++ b/src/tools/miri/tests/fail/validity/too-big-slice.stderr
@@ -6,8 +6,6 @@ LL | ...   let _x: &[u8] = mem::transmute((ptr, usize::MAX));
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/too-big-slice.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/too-big-unsized.stderr b/src/tools/miri/tests/fail/validity/too-big-unsized.stderr
index f283ab960167..6c07308d08ca 100644
--- a/src/tools/miri/tests/fail/validity/too-big-unsized.stderr
+++ b/src/tools/miri/tests/fail/validity/too-big-unsized.stderr
@@ -6,8 +6,6 @@ LL | ...   let _x: &MySlice = mem::transmute((ptr, isize::MAX as usize));
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/too-big-unsized.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/transmute_through_ptr.stderr b/src/tools/miri/tests/fail/validity/transmute_through_ptr.stderr
index c30c532496dc..998ff79d3afe 100644
--- a/src/tools/miri/tests/fail/validity/transmute_through_ptr.stderr
+++ b/src/tools/miri/tests/fail/validity/transmute_through_ptr.stderr
@@ -6,8 +6,6 @@ LL |     let y = x; // reading this ought to be enough to trigger validation
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/transmute_through_ptr.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/uninit_float.stderr b/src/tools/miri/tests/fail/validity/uninit_float.stderr
index 0c859d727641..7f3c94a87874 100644
--- a/src/tools/miri/tests/fail/validity/uninit_float.stderr
+++ b/src/tools/miri/tests/fail/validity/uninit_float.stderr
@@ -6,8 +6,6 @@ LL |     let _val: [f32; 1] = unsafe { std::mem::uninitialized() };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/uninit_float.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/uninit_integer.stderr b/src/tools/miri/tests/fail/validity/uninit_integer.stderr
index 5d31e2659ee6..a80396f7f1ce 100644
--- a/src/tools/miri/tests/fail/validity/uninit_integer.stderr
+++ b/src/tools/miri/tests/fail/validity/uninit_integer.stderr
@@ -6,8 +6,6 @@ LL |     let _val = unsafe { std::mem::MaybeUninit::<[usize; 1]>::uninit().assum
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/uninit_integer.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/uninit_raw_ptr.stderr b/src/tools/miri/tests/fail/validity/uninit_raw_ptr.stderr
index d2e9408adbe0..946d74d35484 100644
--- a/src/tools/miri/tests/fail/validity/uninit_raw_ptr.stderr
+++ b/src/tools/miri/tests/fail/validity/uninit_raw_ptr.stderr
@@ -6,8 +6,6 @@ LL |     let _val = unsafe { std::mem::MaybeUninit::<[*const u8; 1]>::uninit().a
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/uninit_raw_ptr.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/wrong-dyn-trait-assoc-type.stderr b/src/tools/miri/tests/fail/validity/wrong-dyn-trait-assoc-type.stderr
index 23d43867920a..ea77d11f1e83 100644
--- a/src/tools/miri/tests/fail/validity/wrong-dyn-trait-assoc-type.stderr
+++ b/src/tools/miri/tests/fail/validity/wrong-dyn-trait-assoc-type.stderr
@@ -6,8 +6,6 @@ LL |     let v: Box<dyn Trait<Assoc = bool>> = unsafe { std::mem::transmute(v) }
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/wrong-dyn-trait-assoc-type.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/wrong-dyn-trait-generic.stderr b/src/tools/miri/tests/fail/validity/wrong-dyn-trait-generic.stderr
index c5df837a9776..f9e2f15d98f9 100644
--- a/src/tools/miri/tests/fail/validity/wrong-dyn-trait-generic.stderr
+++ b/src/tools/miri/tests/fail/validity/wrong-dyn-trait-generic.stderr
@@ -6,8 +6,6 @@ LL |     let _y: *const dyn Trait<u32> = unsafe { mem::transmute(x) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/wrong-dyn-trait-generic.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/validity/wrong-dyn-trait.stderr b/src/tools/miri/tests/fail/validity/wrong-dyn-trait.stderr
index 1dcbd9c774de..47efd0b0428c 100644
--- a/src/tools/miri/tests/fail/validity/wrong-dyn-trait.stderr
+++ b/src/tools/miri/tests/fail/validity/wrong-dyn-trait.stderr
@@ -6,8 +6,6 @@ LL |     let _y: *const dyn fmt::Debug = unsafe { mem::transmute(x) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/validity/wrong-dyn-trait.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/weak_memory/weak_uninit.stderr b/src/tools/miri/tests/fail/weak_memory/weak_uninit.stderr
index 7adcb28e4bcb..99e06e7febf5 100644
--- a/src/tools/miri/tests/fail/weak_memory/weak_uninit.stderr
+++ b/src/tools/miri/tests/fail/weak_memory/weak_uninit.stderr
@@ -6,8 +6,6 @@ LL |     let j2 = spawn(move || x.load(Ordering::Relaxed));
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE on thread `unnamed-ID`:
-   = note: inside closure at tests/fail/weak_memory/weak_uninit.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/fail/zst_local_oob.stderr b/src/tools/miri/tests/fail/zst_local_oob.stderr
index 5bb29514d9a7..4c6c1be6fd23 100644
--- a/src/tools/miri/tests/fail/zst_local_oob.stderr
+++ b/src/tools/miri/tests/fail/zst_local_oob.stderr
@@ -6,8 +6,6 @@ LL |     let _val = unsafe { *x };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/fail/zst_local_oob.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/genmc/fail/atomics/atomic_ptr_invalid_provenance.make.stderr b/src/tools/miri/tests/genmc/fail/atomics/atomic_ptr_invalid_provenance.make.stderr
index d74fa12256bb..d866b8514c96 100644
--- a/src/tools/miri/tests/genmc/fail/atomics/atomic_ptr_invalid_provenance.make.stderr
+++ b/src/tools/miri/tests/genmc/fail/atomics/atomic_ptr_invalid_provenance.make.stderr
@@ -12,8 +12,6 @@ help: ALLOC was allocated here:
    |
 LL |         let mut b = Box::new(0u64);
    |                     ^^^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `miri_start` at tests/genmc/fail/atomics/atomic_ptr_invalid_provenance.rs:LL:CC
 
 note: add `-Zmiri-genmc-print-genmc-output` to MIRIFLAGS to see the detailed GenMC error report
 
diff --git a/src/tools/miri/tests/genmc/fail/atomics/atomic_ptr_invalid_provenance.send.stderr b/src/tools/miri/tests/genmc/fail/atomics/atomic_ptr_invalid_provenance.send.stderr
index d74fa12256bb..d866b8514c96 100644
--- a/src/tools/miri/tests/genmc/fail/atomics/atomic_ptr_invalid_provenance.send.stderr
+++ b/src/tools/miri/tests/genmc/fail/atomics/atomic_ptr_invalid_provenance.send.stderr
@@ -12,8 +12,6 @@ help: ALLOC was allocated here:
    |
 LL |         let mut b = Box::new(0u64);
    |                     ^^^^^^^^^^^^^^
-   = note: BACKTRACE (of the first span):
-   = note: inside `miri_start` at tests/genmc/fail/atomics/atomic_ptr_invalid_provenance.rs:LL:CC
 
 note: add `-Zmiri-genmc-print-genmc-output` to MIRIFLAGS to see the detailed GenMC error report
 
diff --git a/src/tools/miri/tests/genmc/fail/loom/buggy_inc.stderr b/src/tools/miri/tests/genmc/fail/loom/buggy_inc.stderr
index 290cdf90a084..ad98ba6aeb9a 100644
--- a/src/tools/miri/tests/genmc/fail/loom/buggy_inc.stderr
+++ b/src/tools/miri/tests/genmc/fail/loom/buggy_inc.stderr
@@ -4,9 +4,6 @@ error: abnormal termination: the program aborted execution
    |
 LL |             std::process::abort();
    |             ^^^^^^^^^^^^^^^^^^^^^ abnormal termination occurred here
-   |
-   = note: BACKTRACE:
-   = note: inside `miri_start` at tests/genmc/fail/loom/buggy_inc.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/genmc/fail/loom/store_buffering.genmc.stderr b/src/tools/miri/tests/genmc/fail/loom/store_buffering.genmc.stderr
index 7742790e3330..658914ba088d 100644
--- a/src/tools/miri/tests/genmc/fail/loom/store_buffering.genmc.stderr
+++ b/src/tools/miri/tests/genmc/fail/loom/store_buffering.genmc.stderr
@@ -4,9 +4,6 @@ error: abnormal termination: the program aborted execution
    |
 LL |             std::process::abort();
    |             ^^^^^^^^^^^^^^^^^^^^^ abnormal termination occurred here
-   |
-   = note: BACKTRACE:
-   = note: inside `miri_start` at tests/genmc/fail/loom/store_buffering.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/genmc/fail/loom/store_buffering.non_genmc.stderr b/src/tools/miri/tests/genmc/fail/loom/store_buffering.non_genmc.stderr
index a6c3ed7055e7..d2036d464bb5 100644
--- a/src/tools/miri/tests/genmc/fail/loom/store_buffering.non_genmc.stderr
+++ b/src/tools/miri/tests/genmc/fail/loom/store_buffering.non_genmc.stderr
@@ -3,9 +3,6 @@ error: abnormal termination: the program aborted execution
    |
 LL |             std::process::abort();
    |             ^^^^^^^^^^^^^^^^^^^^^ abnormal termination occurred here
-   |
-   = note: BACKTRACE:
-   = note: inside `miri_start` at tests/genmc/fail/loom/store_buffering.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/genmc/fail/simple/2w2w_weak.relaxed4.stderr b/src/tools/miri/tests/genmc/fail/simple/2w2w_weak.relaxed4.stderr
index 80ac7206644c..d6c66bf8f5c4 100644
--- a/src/tools/miri/tests/genmc/fail/simple/2w2w_weak.relaxed4.stderr
+++ b/src/tools/miri/tests/genmc/fail/simple/2w2w_weak.relaxed4.stderr
@@ -4,9 +4,6 @@ error: abnormal termination: the program aborted execution
    |
 LL |             std::process::abort();
    |             ^^^^^^^^^^^^^^^^^^^^^ abnormal termination occurred here
-   |
-   = note: BACKTRACE:
-   = note: inside `miri_start` at tests/genmc/fail/simple/2w2w_weak.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/genmc/fail/simple/2w2w_weak.release4.stderr b/src/tools/miri/tests/genmc/fail/simple/2w2w_weak.release4.stderr
index 80ac7206644c..d6c66bf8f5c4 100644
--- a/src/tools/miri/tests/genmc/fail/simple/2w2w_weak.release4.stderr
+++ b/src/tools/miri/tests/genmc/fail/simple/2w2w_weak.release4.stderr
@@ -4,9 +4,6 @@ error: abnormal termination: the program aborted execution
    |
 LL |             std::process::abort();
    |             ^^^^^^^^^^^^^^^^^^^^^ abnormal termination occurred here
-   |
-   = note: BACKTRACE:
-   = note: inside `miri_start` at tests/genmc/fail/simple/2w2w_weak.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/genmc/fail/simple/2w2w_weak.sc3_rel1.stderr b/src/tools/miri/tests/genmc/fail/simple/2w2w_weak.sc3_rel1.stderr
index 80ac7206644c..d6c66bf8f5c4 100644
--- a/src/tools/miri/tests/genmc/fail/simple/2w2w_weak.sc3_rel1.stderr
+++ b/src/tools/miri/tests/genmc/fail/simple/2w2w_weak.sc3_rel1.stderr
@@ -4,9 +4,6 @@ error: abnormal termination: the program aborted execution
    |
 LL |             std::process::abort();
    |             ^^^^^^^^^^^^^^^^^^^^^ abnormal termination occurred here
-   |
-   = note: BACKTRACE:
-   = note: inside `miri_start` at tests/genmc/fail/simple/2w2w_weak.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/native-lib/fail/function_not_in_so.stderr b/src/tools/miri/tests/native-lib/fail/function_not_in_so.stderr
index 632696e8249a..fd99ab53a924 100644
--- a/src/tools/miri/tests/native-lib/fail/function_not_in_so.stderr
+++ b/src/tools/miri/tests/native-lib/fail/function_not_in_so.stderr
@@ -5,8 +5,6 @@ LL |         foo();
    |         ^^^^^ unsupported operation occurred here
    |
    = help: this means the program tried to do something Miri does not support; it does not indicate a bug in the program
-   = note: BACKTRACE:
-   = note: inside `main` at tests/native-lib/fail/function_not_in_so.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/native-lib/fail/pass_struct_expose_only_range.stderr b/src/tools/miri/tests/native-lib/fail/pass_struct_expose_only_range.stderr
index a8f85001c233..8ef41fce35e6 100644
--- a/src/tools/miri/tests/native-lib/fail/pass_struct_expose_only_range.stderr
+++ b/src/tools/miri/tests/native-lib/fail/pass_struct_expose_only_range.stderr
@@ -8,8 +8,6 @@ LL |         let r = access_struct_ptr(structs[1]);
    = help: in particular, Miri assumes that the native call initializes all memory it has access to
    = help: Miri also assumes that any part of this memory may be a pointer that is permitted to point to arbitrary exposed memory
    = help: what this means is that Miri will easily miss Undefined Behavior related to incorrect usage of this shared memory, so you should not take a clean Miri run as a signal that your FFI code is UB-free
-   = note: BACKTRACE:
-   = note: inside `main` at tests/native-lib/fail/pass_struct_expose_only_range.rs:LL:CC
 
 error: Undefined Behavior: memory access failed: attempting to access 1 byte, but got $HEX[noalloc] which is a dangling pointer (it has no provenance)
   --> tests/native-lib/fail/pass_struct_expose_only_range.rs:LL:CC
@@ -19,8 +17,6 @@ LL |         let _val = *std::ptr::with_exposed_provenance::<u8>(structs[0].ptr.
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/native-lib/fail/pass_struct_expose_only_range.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/native-lib/fail/private_function.stderr b/src/tools/miri/tests/native-lib/fail/private_function.stderr
index 9b32d0c381b6..0e51835b0b82 100644
--- a/src/tools/miri/tests/native-lib/fail/private_function.stderr
+++ b/src/tools/miri/tests/native-lib/fail/private_function.stderr
@@ -5,8 +5,6 @@ LL |         not_exported();
    |         ^^^^^^^^^^^^^^ unsupported operation occurred here
    |
    = help: this means the program tried to do something Miri does not support; it does not indicate a bug in the program
-   = note: BACKTRACE:
-   = note: inside `main` at tests/native-lib/fail/private_function.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/native-lib/fail/struct_not_extern_c.stderr b/src/tools/miri/tests/native-lib/fail/struct_not_extern_c.stderr
index 90e59a31da42..a9158a0c6bac 100644
--- a/src/tools/miri/tests/native-lib/fail/struct_not_extern_c.stderr
+++ b/src/tools/miri/tests/native-lib/fail/struct_not_extern_c.stderr
@@ -5,8 +5,6 @@ LL |     unsafe { pass_struct(pass_me) };
    |              ^^^^^^^^^^^^^^^^^^^^ unsupported operation occurred here
    |
    = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support
-   = note: BACKTRACE:
-   = note: inside `main` at tests/native-lib/fail/struct_not_extern_c.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/native-lib/fail/uninit_struct.stderr b/src/tools/miri/tests/native-lib/fail/uninit_struct.stderr
index 0fe6ad9c77bb..9833b65b91b3 100644
--- a/src/tools/miri/tests/native-lib/fail/uninit_struct.stderr
+++ b/src/tools/miri/tests/native-lib/fail/uninit_struct.stderr
@@ -6,8 +6,6 @@ LL |     unsafe { pass_struct_complex(*arg.as_ptr(), 0, 0, 0) };
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
-   = note: BACKTRACE:
-   = note: inside `main` at tests/native-lib/fail/uninit_struct.rs:LL:CC
 
 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
 
diff --git a/src/tools/miri/tests/pass/alloc-access-tracking.rs b/src/tools/miri/tests/pass/alloc-access-tracking.rs
index 3578a4863301..7774b75d5471 100644
--- a/src/tools/miri/tests/pass/alloc-access-tracking.rs
+++ b/src/tools/miri/tests/pass/alloc-access-tracking.rs
@@ -1,5 +1,4 @@
 //@compile-flags: -Zmiri-track-alloc-accesses
-//@normalize-stderr-test: "id \d+" -> "id $$ALLOC"
 
 #[path = "../utils/mod.rs"]
 mod utils;
diff --git a/src/tools/miri/tests/pass/alloc-access-tracking.stderr b/src/tools/miri/tests/pass/alloc-access-tracking.stderr
index cc0cf1f277d5..745fd89f9f54 100644
--- a/src/tools/miri/tests/pass/alloc-access-tracking.stderr
+++ b/src/tools/miri/tests/pass/alloc-access-tracking.stderr
@@ -3,18 +3,12 @@ note: now tracking allocation ALLOC of 123 bytes (alignment ALIGN bytes)
    |
 LL |         utils::miri_track_alloc(ptr);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ tracking was triggered here
-   |
-   = note: BACKTRACE:
-   = note: inside `main` at tests/pass/alloc-access-tracking.rs:LL:CC
 
 note: write access at ALLOC[0..1]
   --> tests/pass/alloc-access-tracking.rs:LL:CC
    |
 LL |         *ptr = 42; // Crucially, only a write is printed here, no read!
    |         ^^^^^^^^^ tracking was triggered here
-   |
-   = note: BACKTRACE:
-   = note: inside `main` at tests/pass/alloc-access-tracking.rs:LL:CC
 
 note: read access at ALLOC[0..1]
   --> tests/pass/alloc-access-tracking.rs:LL:CC
@@ -22,8 +16,6 @@ note: read access at ALLOC[0..1]
 LL |         assert_eq!(*ptr, 42);
    |         ^^^^^^^^^^^^^^^^^^^^ tracking was triggered here
    |
-   = note: BACKTRACE:
-   = note: inside `main` at RUSTLIB/core/src/macros/mod.rs:LL:CC
    = note: this note originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 note: freed allocation ALLOC
diff --git a/src/tools/miri/tests/pass/extern_types.stack.stderr b/src/tools/miri/tests/pass/extern_types.stack.stderr
index bd51efeb3e3d..88825169e1cd 100644
--- a/src/tools/miri/tests/pass/extern_types.stack.stderr
+++ b/src/tools/miri/tests/pass/extern_types.stack.stderr
@@ -6,6 +6,4 @@ LL |     let x: &Foo = unsafe { &*(ptr::without_provenance::<()>(16) as *const F
    |
    = help: `extern type` are not compatible with the Stacked Borrows aliasing model implemented by Miri; Miri may miss bugs in this code
    = help: try running with `MIRIFLAGS=-Zmiri-tree-borrows` to use the more permissive but also even more experimental Tree Borrows aliasing checks instead
-   = note: BACKTRACE:
-   = note: inside `main` at tests/pass/extern_types.rs:LL:CC
 
diff --git a/src/tools/miri/tests/pass/stacked_borrows/issue-miri-2389.stderr b/src/tools/miri/tests/pass/stacked_borrows/issue-miri-2389.stderr
index 8ca3c6c618ea..363f8a20f8da 100644
--- a/src/tools/miri/tests/pass/stacked_borrows/issue-miri-2389.stderr
+++ b/src/tools/miri/tests/pass/stacked_borrows/issue-miri-2389.stderr
@@ -9,6 +9,4 @@ LL |         let wildcard = &root0 as *const Cell<i32> as usize as *const Cell<i
    = help: to ensure that Miri does not miss bugs in your program, use Strict Provenance APIs (https://doc.rust-lang.org/nightly/std/ptr/index.html#strict-provenance, https://crates.io/crates/sptr) instead
    = help: you can then set `MIRIFLAGS=-Zmiri-strict-provenance` to ensure you are not relying on `with_exposed_provenance` semantics
    = help: alternatively, `MIRIFLAGS=-Zmiri-permissive-provenance` disables this warning
-   = note: BACKTRACE:
-   = note: inside `main` at tests/pass/stacked_borrows/issue-miri-2389.rs:LL:CC