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test_staggered_race_with_eager_tasks fails with CancelledError #158097
Description
Bug report
Bug description:
We're occasionally seeing test.test_asyncio.test_eager_task_factory.PyEagerTaskFactoryLoopTests.test_staggered_race_with_eager_tasks fail:
Traceback (most recent call last):
File "/usr/lib/python3.14/test/test_asyncio/test_eager_task_factory.py", line 242, in test_staggered_race_with_eager_tasks
self.run_coro(run())
~~~~~~~~~~~~~^^^^^^^
File "/usr/lib/python3.14/test/test_asyncio/test_eager_task_factory.py", line 36, in run_coro
return self.loop.run_until_complete(coro)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
File "/usr/lib/python3.14/asyncio/base_events.py", line 720, in run_until_complete
return future.result()
~~~~~~~~~~~~~^^
File "/usr/lib/python3.14/asyncio/futures.py", line 208, in result
raise self._exception.with_traceback(self._exception_tb)
File "/usr/lib/python3.14/asyncio/tasks.py", line 289, in __step_run_and_handle_result
result = coro.send(None)
File "/usr/lib/python3.14/test/test_asyncio/test_eager_task_factory.py", line 240, in run
self.assertIsInstance(excs[2], ValueError)
~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^
AssertionError: CancelledError() is not an instance of <class 'ValueError'>
This is rarely happening, but we've seen it in CI runs of the Python test suite (OpenEmbedded, Python 3.14.7).
CPython versions tested on:
3.14
Operating systems tested on:
Linux
Activity
Fix race condition in asyncio.staggered_race (pythongh-158097)
Fix race condition in asyncio.staggered_race (pythongh-158097)