[3.12] gh-118997: Fix _Py_ClearImmortal() assertion (#119001)

Fix _Py_ClearImmortal() assertion: use _Py_IsImmortal() to tolerate
reference count lower than _Py_IMMORTAL_REFCNT. Fix the assertion for
the stable ABI, when a C extension is built with Python 3.11 or
lower.

diff --git a/Include/internal/pycore_object.h b/Include/internal/pycore_object.h
index 7a2f13a21bda76067689fcd5115361db396ad9d4..63e74a65f43c018d114e8f765126b21984f2d77e 100644 (file)
--- a/Include/internal/pycore_object.h
+++ b/Include/internal/pycore_object.h
@@ -80,7 +80,7 @@ static inline void _Py_SetImmortal(PyObject *op)
 static inline void _Py_ClearImmortal(PyObject *op)
 {
     if (op) {
-        assert(op->ob_refcnt == _Py_IMMORTAL_REFCNT);
+        assert(_Py_IsImmortal(op));
         op->ob_refcnt = 1;
         Py_DECREF(op);
     }

diff --git a/Misc/NEWS.d/next/Core and Builtins/2024-05-13-16-00-05.gh-issue-118997.GWqWdt.rst b/Misc/NEWS.d/next/Core and Builtins/2024-05-13-16-00-05.gh-issue-118997.GWqWdt.rst
new file mode 100644 (file)
index 0000000..85d6dc8
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2024-05-13-16-00-05.gh-issue-118997.GWqWdt.rst
@@ -0,0 +1,4 @@
+Fix _Py_ClearImmortal() assertion: use _Py_IsImmortal() to tolerate
+reference count lower than _Py_IMMORTAL_REFCNT. Fix the assertion for the
+stable ABI, when a C extension is built with Python 3.11 or lower. Patch by
+Victor Stinner.