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gh-117657: Fix data race in _Py_IsImmortal (#118261)

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The load of `ob_ref_local races with stores. Using a relaxed load is
sufficient; stores to the field are relaxed.
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mpage 2024-04-25 08:31:57 -07:00 • committed by GitHub
parent fb7f79b4da
commit f14e9f9154
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2 changed files with 2 additions and 2 deletions
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Include/object.h
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@ -349,7 +349,8 @@ static inline Py_ssize_t Py_SIZE(PyObject *ob) {
static inline Py_ALWAYS_INLINE int _Py_IsImmortal(PyObject *op)
{
#if defined(Py_GIL_DISABLED)
return (op->ob_ref_local == _Py_IMMORTAL_REFCNT_LOCAL);
return (_Py_atomic_load_uint32_relaxed(&op->ob_ref_local) ==
_Py_IMMORTAL_REFCNT_LOCAL);
#elif SIZEOF_VOID_P > 4
return (_Py_CAST(PY_INT32_T, op->ob_refcnt) < 0);
#else