https://github.com/python/cpython/commit/1e9b8f2f8512ca4ede6ca24113a70e13c9a7cf6b
commit: 1e9b8f2f8512ca4ede6ca24113a70e13c9a7cf6b
branch: main
author: R. David Murray <rdmur...@bitdance.com>
committer: kumaraditya303 <kumaradi...@python.org>
date: 2025-07-28T22:02:34+05:30
summary:
gh-131338: Disable computed stack limit checks on non-glibc linux (#134336)
Co-authored-by: Kumar Aditya <kumaradi...@python.org>
Co-authored-by: Victor Stinner <vstin...@python.org>
files:
A
Misc/NEWS.d/next/Core_and_Builtins/2025-07-25-22-31-52.gh-issue-131338.zJDCMp.rst
M Python/ceval.c
diff --git
a/Misc/NEWS.d/next/Core_and_Builtins/2025-07-25-22-31-52.gh-issue-131338.zJDCMp.rst
b/Misc/NEWS.d/next/Core_and_Builtins/2025-07-25-22-31-52.gh-issue-131338.zJDCMp.rst
new file mode 100644
index 00000000000000..6c064e8f4a0339
--- /dev/null
+++
b/Misc/NEWS.d/next/Core_and_Builtins/2025-07-25-22-31-52.gh-issue-131338.zJDCMp.rst
@@ -0,0 +1,2 @@
+Disable computed stack limit checks on non-glibc linux platforms to fix
+crashes on deep recursion.
diff --git a/Python/ceval.c b/Python/ceval.c
index 291e753dec0ce5..9ccd42bdf0a55c 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -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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