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gh-151546: Fix stack limits on musl #151548

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gh-151546: Fix stack limits on musl #151548

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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2026-06-16-17-23-37.gh-issue-151546.LhiaZz.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
Fix the stack limit check if Python is linked to musl (ex: Alpine Linux).
Use the stack size set by the linker to compute the stack limits. Patch by
Victor Stinner.
4 changes: 3 additions & 1 deletion Python/ceval.c
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Expand Up @@ -49,7 +49,9 @@ _Py_ReachedRecursionLimitWithMargin(PyThreadState *tstate, int margin_count)
#endif
}

#if defined(__s390x__)
#if defined(_Py_LINKER_THREAD_STACK_SIZE)
# define Py_C_STACK_SIZE _Py_LINKER_THREAD_STACK_SIZE
#elif defined(__s390x__)
# define Py_C_STACK_SIZE 320000
#elif defined(_WIN32)
// Don't define Py_C_STACK_SIZE, ask the O/S
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4 changes: 4 additions & 0 deletions configure
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3 changes: 3 additions & 0 deletions configure.ac
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Expand Up @@ -2507,6 +2507,9 @@ EOF

if test "$ac_cv_thread_stack_size" != "default" -a "$ac_cv_thread_stack_size" != "unknown"; then
LDFLAGS="$LDFLAGS -Wl,-z,stack-size=$ac_cv_thread_stack_size"
# Stack size used by Python/ceval.c to set Py_C_STACK_SIZE
AC_DEFINE_UNQUOTED([_Py_LINKER_THREAD_STACK_SIZE], [$ac_cv_thread_stack_size],
[Thread stack size set by the linker (in bytes).])
fi
fi

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3 changes: 3 additions & 0 deletions pyconfig.h.in
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Expand Up @@ -2088,6 +2088,9 @@
/* Define if you have the 'PR_SET_VMA_ANON_NAME' constant. */
#undef _Py_HAVE_PR_SET_VMA_ANON_NAME

/* Thread stack size set by the linker (in bytes). */
#undef _Py_LINKER_THREAD_STACK_SIZE

/* Define to 1 if the machine stack grows down (default); 0 if it grows up. */
#undef _Py_STACK_GROWS_DOWN

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