Spicy-cream opened a new pull request, #3472:
URL: https://github.com/apache/brpc/pull/3472
Fixes #2781
bthread_jump_fcontext (src/bthread/context.cpp, linux x86_64) does not
save/restore the callee-saved SIMD registers %xmm6..%xmm15. Clang at -O2
keeps live float/vector values in these registers and expects them to be
preserved across the user-level context switch. Because they are not,
suspending a bthread corrupts the caller's float/vector state, causing an
intermittent core dump in streaming RPC.
aarch64 already saves d8..d15 unconditionally, which is why it is not
affected. This change mirrors that behavior for x86_64.
Note: proposed based on code analysis; runtime verification on an
x86_64 + clang environment is recommended.
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