From c053d52edd1e05ccc339e380b705749a3240d645 Mon Sep 17 00:00:00 2001
From: Mark Shannon <mark@hotpy.org>
Date: Tue, 16 Apr 2024 12:51:41 +0100
Subject: [PATCH] GH-115776: Static object are immortal, so mark them as such.
 (GH-117673)

---
 Include/object.h                                | 17 +++++++----------
 ...24-04-09-11-31-25.gh-issue-115776.5Nthd0.rst |  2 ++
 2 files changed, 9 insertions(+), 10 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Core and Builtins/2024-04-09-11-31-25.gh-issue-115776.5Nthd0.rst

diff --git a/Include/object.h b/Include/object.h
index 13443329dfb5a2..ffcacf1a3ef4ed 100644
--- a/Include/object.h
+++ b/Include/object.h
@@ -115,8 +115,11 @@ check by comparing the reference count field to the immortality reference count.
 // Kept for backward compatibility. It was needed by Py_TRACE_REFS build.
 #define _PyObject_EXTRA_INIT
 
-// Make all internal uses of PyObject_HEAD_INIT immortal while preserving the
-// C-API expectation that the refcnt will be set to 1.
+/* Make all uses of PyObject_HEAD_INIT immortal.
+ *
+ * Statically allocated objects might be shared between
+ * interpreters, so must be marked as immortal.
+ */
 #if defined(Py_GIL_DISABLED)
 #define PyObject_HEAD_INIT(type)    \
     {                               \
@@ -128,19 +131,13 @@ check by comparing the reference count field to the immortality reference count.
         0,                          \
         (type),                     \
     },
-#elif defined(Py_BUILD_CORE)
+#else
 #define PyObject_HEAD_INIT(type)    \
     {                               \
         { _Py_IMMORTAL_REFCNT },    \
         (type)                      \
     },
-#else
-#define PyObject_HEAD_INIT(type) \
-    {                            \
-        { 1 },                   \
-        (type)                   \
-    },
-#endif /* Py_BUILD_CORE */
+#endif
 
 #define PyVarObject_HEAD_INIT(type, size) \
     {                                     \
diff --git a/Misc/NEWS.d/next/Core and Builtins/2024-04-09-11-31-25.gh-issue-115776.5Nthd0.rst b/Misc/NEWS.d/next/Core and Builtins/2024-04-09-11-31-25.gh-issue-115776.5Nthd0.rst
new file mode 100644
index 00000000000000..5fc0080bcb9551
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2024-04-09-11-31-25.gh-issue-115776.5Nthd0.rst	
@@ -0,0 +1,2 @@
+Statically allocated objects are, by definition, immortal so must be
+marked as such regardless of whether they are in extension modules or not.