https://github.com/python/cpython/commit/1ec6596828b0db4317d85afa85e1f68a3551a07e
commit: 1ec6596828b0db4317d85afa85e1f68a3551a07e
branch: main
author: Thomas Kowalski <[email protected]>
committer: kumaraditya303 <[email protected]>
date: 2026-06-11T15:07:36Z
summary:
gh-150858: fix data race while changing `__qualname__` of a type object(#150859)
files:
A
Misc/NEWS.d/next/Core_and_Builtins/2026-06-03-16-27-00.gh-issue-150858.j2dSkD.rst
M Objects/typeobject.c
diff --git
a/Misc/NEWS.d/next/Core_and_Builtins/2026-06-03-16-27-00.gh-issue-150858.j2dSkD.rst
b/Misc/NEWS.d/next/Core_and_Builtins/2026-06-03-16-27-00.gh-issue-150858.j2dSkD.rst
new file mode 100644
index 00000000000000..dcb932bf320629
--- /dev/null
+++
b/Misc/NEWS.d/next/Core_and_Builtins/2026-06-03-16-27-00.gh-issue-150858.j2dSkD.rst
@@ -0,0 +1 @@
+Fix a data race while changing ``__qualname__`` of a type concurrently on
free-threaded builds.
diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index e0464fe6475cfd..de5bb5f1f2a0df 100644
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -1594,7 +1594,12 @@ type_set_qualname(PyObject *tp, PyObject *value, void
*context)
}
et = (PyHeapTypeObject*)type;
- Py_SETREF(et->ht_qualname, Py_NewRef(value));
+ PyInterpreterState *interp = _PyInterpreterState_GET();
+ _PyEval_StopTheWorld(interp);
+ PyObject *old_qualname = et->ht_qualname;
+ et->ht_qualname = Py_NewRef(value);
+ _PyEval_StartTheWorld(interp);
+ Py_DECREF(old_qualname);
return 0;
}
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