diff --git a/Lib/test/test_asyncio/test_tasks.py b/Lib/test/test_asyncio/test_tasks.py index a1013ab8033..9d2d356631b 100644 --- a/Lib/test/test_asyncio/test_tasks.py +++ b/Lib/test/test_asyncio/test_tasks.py @@ -2688,6 +2688,28 @@ class BaseTaskTests: finally: loop.close() + def test_proper_refcounts(self): + # see: https://github.com/python/cpython/issues/126083 + class Break: + def __str__(self): + raise RuntimeError("break") + + obj = object() + initial_refcount = sys.getrefcount(obj) + + coro = coroutine_function() + loop = asyncio.new_event_loop() + task = asyncio.Task.__new__(asyncio.Task) + + for _ in range(5): + with self.assertRaisesRegex(RuntimeError, 'break'): + task.__init__(coro, loop=loop, context=obj, name=Break()) + + coro.close() + del task + + self.assertEqual(sys.getrefcount(obj), initial_refcount) + def add_subclass_tests(cls): BaseTask = cls.Task diff --git a/Misc/NEWS.d/next/Library/2024-10-28-22-35-22.gh-issue-126083.TuI--n.rst b/Misc/NEWS.d/next/Library/2024-10-28-22-35-22.gh-issue-126083.TuI--n.rst new file mode 100644 index 00000000000..d64b7dd2fed --- /dev/null +++ b/Misc/NEWS.d/next/Library/2024-10-28-22-35-22.gh-issue-126083.TuI--n.rst @@ -0,0 +1 @@ +Fixed a reference leak in :class:`asyncio.Task` objects when reinitializing the same object with a non-``None`` context. Patch by Nico Posada. diff --git a/Modules/_asynciomodule.c b/Modules/_asynciomodule.c index d4135f04e56..c2500fbd692 100644 --- a/Modules/_asynciomodule.c +++ b/Modules/_asynciomodule.c @@ -2120,7 +2120,7 @@ _asyncio_Task___init___impl(TaskObj *self, PyObject *coro, PyObject *loop, return -1; } } else { - self->task_context = Py_NewRef(context); + Py_XSETREF(self->task_context, Py_NewRef(context)); } Py_CLEAR(self->task_fut_waiter);