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…ask lists When a thread exits with pending asyncio Tasks, PyThreadState_Clear() moves them onto the shared interp->asyncio_tasks_head list, but each Task still records the _Py_ThreadId() of the thread that created it. unregister_task() skips the stop-the-world pause whenever that id matches the current thread. That also happens for a later thread that reuses the exited thread's pthread_t, and for destructors that run later in PyThreadState_Clear(). The resulting unlocked llist_remove() calls on the shared list race with each other and can leave an already-removed node (next == NULL) linked into it. asyncio.all_tasks(), which asyncio.run() calls on shutdown, then crashes with SIGSEGV in _asyncio_all_tasks(). Record the unique id (PyThreadState.id) of the creating thread state instead, and only take the lock-free path while that thread state is not being cleared. Also drop the assertion in add_tasks_llist() that every linked Task is pending. A Task's state is set before unregister_task() unlinks it, and that removal can be waiting for the stop-the-world pause during which the list is walked. add_one_task() already filters out Tasks that are done.
jblespiau
requested review from
1st1,
asvetlov,
kumaraditya303 and
willingc
as code owners
October 15, 2026 18:45
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When a thread exits with pending asyncio Tasks, PyThreadState_Clear() moves them onto the shared interp->asyncio_tasks_head list, but each Task still records the _Py_ThreadId() of the thread that created it. unregister_task() skips the stop-the-world pause whenever that id matches the current thread. That also happens for a later thread that reuses the exited thread's pthread_t, and for destructors that run later in PyThreadState_Clear(). The resulting unlocked llist_remove() calls on the shared list race with each other and can leave an already-removed node (next == NULL) linked into it. asyncio.all_tasks(), which asyncio.run() calls on shutdown, then crashes with SIGSEGV in _asyncio_all_tasks().
Record the unique id (PyThreadState.id) of the creating thread state instead, and only take the lock-free path while that thread state is not being cleared.
Also drop the assertion in add_tasks_llist() that every linked Task is pending. A Task's state is set before unregister_task() unlinks it, and that removal can be waiting for the stop-the-world pause during which the list is walked. add_one_task() already filters out Tasks that are done.
3.14 fix is in #159451 that we can reopen if this one is accepted.