https://github.com/python/cpython/commit/506242706e43af85f841027b7bd7f022f8acd939
commit: 506242706e43af85f841027b7bd7f022f8acd939
branch: main
author: Sergey Miryanov <[email protected]>
committer: kumaraditya303 <[email protected]>
date: 2026-07-25T09:01:06+05:30
summary:
GH-153809: Untrack TaskObj from GC before calling unregister_task (#154563)
files:
A
Misc/NEWS.d/next/Core_and_Builtins/2026-07-24-13-15-31.gh-issue-153809.JFA6GT.rst
M Modules/_asynciomodule.c
diff --git
a/Misc/NEWS.d/next/Core_and_Builtins/2026-07-24-13-15-31.gh-issue-153809.JFA6GT.rst
b/Misc/NEWS.d/next/Core_and_Builtins/2026-07-24-13-15-31.gh-issue-153809.JFA6GT.rst
new file mode 100644
index 00000000000000..d2d2c771a68432
--- /dev/null
+++
b/Misc/NEWS.d/next/Core_and_Builtins/2026-07-24-13-15-31.gh-issue-153809.JFA6GT.rst
@@ -0,0 +1,2 @@
+Fix interpreter crash while deallocating objects of :class:`asyncio.Task` on
+free-threaded builds. Contributed by Sergey Miryanov.
diff --git a/Modules/_asynciomodule.c b/Modules/_asynciomodule.c
index bc0f7f3901e0ed..9c29eb8232ed3f 100644
--- a/Modules/_asynciomodule.c
+++ b/Modules/_asynciomodule.c
@@ -2966,13 +2966,17 @@ TaskObj_dealloc(PyObject *self)
if (PyObject_CallFinalizerFromDealloc(self) < 0) {
return; // resurrected
}
+ // Untrack the object before unregistering the task, since the
+ // latter can cause a stop-the-world pause, after which another
+ // thread might call the GC and reach the object while it is
+ // semi-deallocated but still tracked
+ PyObject_GC_UnTrack(self);
+
// unregister the task after finalization so that
// if the task gets resurrected, it remains registered
unregister_task((TaskObj *)self);
PyTypeObject *tp = Py_TYPE(self);
- PyObject_GC_UnTrack(self);
-
PyObject_ClearWeakRefs(self);
(void)TaskObj_clear(self);
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