From d9de0792482d2ded364b0c7d2867b97a5da41b12 Mon Sep 17 00:00:00 2001
From: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>
Date: Wed, 8 Feb 2023 23:32:15 +0530
Subject: [PATCH] GH-101696: invalidate type version tag in
 `_PyStaticType_Dealloc` (#101697)

---
 .../2023-02-08-17-13-31.gh-issue-101696.seJhTt.rst              | 1 +
 Objects/typeobject.c                                            | 2 ++
 2 files changed, 3 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Core and Builtins/2023-02-08-17-13-31.gh-issue-101696.seJhTt.rst

diff --git a/Misc/NEWS.d/next/Core and Builtins/2023-02-08-17-13-31.gh-issue-101696.seJhTt.rst b/Misc/NEWS.d/next/Core and Builtins/2023-02-08-17-13-31.gh-issue-101696.seJhTt.rst
new file mode 100644
index 00000000000000..ff2bbb4b564252
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2023-02-08-17-13-31.gh-issue-101696.seJhTt.rst	
@@ -0,0 +1 @@
+Invalidate type version tag in ``_PyStaticType_Dealloc`` for static types, avoiding bug where a false cache hit could crash the interpreter. Patch by Kumar Aditya.
diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index 59e0bf2995bac2..bf6ccdb77a90f0 100644
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -4469,6 +4469,8 @@ _PyStaticType_Dealloc(PyTypeObject *type)
     }
 
     type->tp_flags &= ~Py_TPFLAGS_READY;
+    type->tp_flags &= ~Py_TPFLAGS_VALID_VERSION_TAG;
+    type->tp_version_tag = 0;
 
     if (type->tp_flags & _Py_TPFLAGS_STATIC_BUILTIN) {
         _PyStaticType_ClearWeakRefs(type);