From 947c1b7bffd873dc748d00700ce87f9fffc725d1 Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Mon, 13 May 2024 15:57:47 +0200
Subject: [PATCH] gh-118997: Fix _Py_ClearImmortal() assertion

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.
---
 Include/internal/pycore_object.h                              | 2 +-
 .../2024-05-13-16-00-05.gh-issue-118997.GWqWdt.rst            | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/Core and Builtins/2024-05-13-16-00-05.gh-issue-118997.GWqWdt.rst

diff --git a/Include/internal/pycore_object.h b/Include/internal/pycore_object.h
index 7a2f13a21bda76..63e74a65f43c01 100644
--- 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
index 00000000000000..85d6dc80ed9c24
--- /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.