8000 gh-128002: fix `asyncio.all_tasks` against concurrent deallocations of tasks by kumaraditya303 · Pull Request #128541 · python/cpython · GitHub
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gh-128002: fix asyncio.all_tasks against concurrent deallocations of tasks #128541

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Merged
merged 4 commits into from
Jan 9, 2025
Merged

gh-128002: fix asyncio.all_tasks against concurrent deallocations of tasks #128541

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6873433
stop the world in all tasks
kumaraditya303 Jan 4, 2025
078f2d4
add comment
kumaraditya303 Jan 6, 2025
58ea4ee
use _Py_TryIncref to protect against concurrent deallocations
kumaraditya303 Jan 7, 2025
0b6922e
fix comment
kumaraditya303 Jan 7, 2025
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@kumaraditya303
kumaraditya303 committed Jan 7, 2025
commit 0b6922e44907eaec778396cf8c1cbf07c0c7f0d1
4 changes: 2 additions & 2 deletions Modules/_asynciomodule.c
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Expand Up @@ -3773,9 +3773,9 @@ _asyncio_all_tasks_impl(PyObject *module, PyObject *loop)
llist_for_each_safe(node, &state->asyncio_tasks_head) {
TaskObj *task = llist_data(node, TaskObj, task_node);
// The linked list holds borrowed references to task
// as such it is possible that it can concurrently
// as such it is possible that the task is concurrently
// deallocated while added to this list.
// To protect against concurrent deallocation,
// To protect against concurrent deallocations,
// we first try to incref the task which would fail
// if it is concurrently getting deallocated in another thread,
// otherwise it gets added to the list.
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