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gh-159876: Detect the C stack size of non-main threads on musl - #159882
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pthread_getattr_np() was skipped on every non-glibc, non-Android Linux because musl misreports the main thread's stack. It is accurate for the threads musl creates itself, so query those and keep the estimate only for the main thread. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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hardware_stack_limits()skippedpthread_getattr_np()on any Linux that is neither glibc nor Android, because musl misreports the main thread's stack. musl is accurate for the threads it creates itself, so the blanket exclusion left the interpreter assumingPy_C_STACK_SIZEeverywhere, and a thread with a smaller stack overflowed before the recursion guard fired.Query the stack on every thread except the process main thread, which keeps the old estimate.
On Alpine 3.24 this takes
c_recursion_remainingfrom a constant 1450 to 250 / 12650 for 256 KiB / 8 MiB threads — the same numbers glibc reports — and the full suite goes from 1 failure (a SIGSEGV intest_lazy_import) toResult: SUCCESS. No change on glibc.🤖 Generated with Claude Code