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gh-131338: Disable new stack size code for non-glibc on linux. #134336

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Merged
merged 6 commits into from
Jul 28, 2025
Merged

gh-131338: Disable new stack size code for non-glibc on linux. #134336

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0d8f676
Disable new stack size code for non-glibc.
bitdancer May 20, 2025
d7262cc
Don't require glibc if it isn't linux.
bitdancer Jun 15, 2025
5c55790
Clarify why we check __glibc__.
bitdancer Jun 16, 2025
ac92003
Apply suggestion from @vstinner
kumaraditya303 Jul 25, 2025
733a28b
add news
kumaraditya303 Jul 25, 2025
6498d29
Merge branch 'main' into revert_new_stack_check_for_non_glibc-131338
kumaraditya303 Jul 25, 2025
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2025-07-25-22-31-52.gh-issue-131338.zJDCMp.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Disable computed stack limit checks on non-glibc linux platforms to fix
crashes on deep recursion.
6 changes: 5 additions & 1 deletion Python/ceval.c
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Expand Up @@ -452,7 +452,11 @@ _Py_InitializeRecursionLimits(PyThreadState *tstate)
_tstate->c_stack_soft_limit = _tstate->c_stack_hard_limit + _PyOS_STACK_MARGIN_BYTES;
#else
uintptr_t here_addr = _Py_get_machine_stack_pointer();
# if defined(HAVE_PTHREAD_GETATTR_NP) && !defined(_AIX) && !defined(__NetBSD__)
/// XXX musl supports HAVE_PTHRED_GETATTR_NP, but the resulting stack size
/// (on alpine at least) is much smaller than expected and imposes undue limits
/// compared to the old stack size estimation. (We assume musl is not glibc.)
# if defined(HAVE_PTHREAD_GETATTR_NP) && !defined(_AIX) && \
!defined(__NetBSD__) && (defined(__GLIBC__) || !defined(__linux__))
size_t stack_size, guard_size;
void *stack_addr;
pthread_attr_t attr;
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