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[gh-117657] _Py_MergeZeroLocalRefcount isn't loading ob_ref_shared with strong enough semantics (#118111) 

Use acquire for load of ob_ref_shared
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Dino Viehland 2024-04-19 14:21:01 -07:00 committed by GitHub
parent b624490dee
commit b45af00bad
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Objects/object.c
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@ -374,7 +374,7 @@ _Py_MergeZeroLocalRefcount(PyObject *op)
assert(op->ob_ref_local == 0);
_Py_atomic_store_uintptr_relaxed(&op->ob_tid, 0);
Py_ssize_t shared = _Py_atomic_load_ssize_relaxed(&op->ob_ref_shared);
Py_ssize_t shared = _Py_atomic_load_ssize_acquire(&op->ob_ref_shared);
if (shared == 0) {
// Fast-path: shared refcount is zero (including flags)
_Py_Dealloc(op);