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[3.15] gh-151546: Fix stack limits on musl (#151548) (#151583)

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gh-151546: Fix stack limits on musl (#151548)

If the thread stack size is set by linker flags, pass the stack size
to Python/ceval.c via the new _Py_LINKER_THREAD_STACK_SIZE variable
to set Py_C_STACK_SIZE macro.

(cherry picked from commit 9a61d1c0c8)
This commit is contained in:
Victor Stinner 2026-06-17 11:13:40 +02:00 • committed by GitHub
parent ff6e973c3b
commit a5c5edddbc
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5 changed files with 16 additions and 1 deletions
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3
Misc/NEWS.d/next/Core_and_Builtins/2026-06-16-17-23-37.gh-issue-151546.LhiaZz.rst Normal file
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@ -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
Python/ceval.c
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@ -63,7 +63,9 @@ _Py_EnterRecursiveCallUnchecked(PyThreadState *tstate)
}
}
#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

4
configure generated vendored
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@ -9918,6 +9918,10 @@ printf "%s\n" "$ac_cv_thread_stack_size" >&6; }
if test "$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
printf "%s\n" "#define _Py_LINKER_THREAD_STACK_SIZE $ac_cv_thread_stack_size" >>confdefs.h
fi
fi

3
configure.ac
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@ -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

3
pyconfig.h.in
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@ -2067,6 +2067,9 @@
/* 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