f4e92e379c
It looks like the old `__rust_probestack` routine is incompatible with newer linux kernels. My best guess for this is that the kernel's auto-growth logic is failing to trigger, causing what looks like a legitimate segfault to get delivered. My best guess for why *that's* happening is that the faulting address is below `%rsp`, whereas previously all faulting stack addresses were above `%rsp`. The probestack routine does not modify `%rsp` as it's probing the stack, and presumably newer kernels are interpreting this as a legitimate violation. This commit tweaks the probestack routine to instead update `%rsp` incrementally as probing happens. The ABI of the function, however, requires that `%rsp` isn't changed as part of the function so it's restored at the end to the previous value. |
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