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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"tests/test_process.py::TestAsyncio_AIO_Process::test_cancel_post_init fails randomly","articleBody":"Found when building on NixOS:\n\n```\ntests/test_process.py .......................................................Unexpected calls to loop.call_exception_handler():\n[{'exception': InvalidStateError('invalid state'),\n  'handle': \u003cHandle _UnixWritePipeTransport._call_connection_lost()\u003e,\n  'message': 'Exception in callback '\n             '_UnixWritePipeTransport._call_connection_lost()'},\n {'exception': InvalidStateError('invalid state'),\n  'handle': \u003cHandle _UnixReadPipeTransport._call_connection_lost()\u003e,\n  'message': 'Exception in callback '\n             '_UnixReadPipeTransport._call_connection_lost()'},\n {'exception': InvalidStateError('invalid state'),\n  'handle': \u003cHandle BaseSubprocessTransport._call_connection_lost()\u003e,\n  'message': 'Exception in callback '\n             'BaseSubprocessTransport._call_connection_lost()'}]\nF......................\ntests/test_process_spawning.py .\ntests/test_regr1.py s\ntests/test_runner.py ..\ntests/test_signals.py .....................\ntests/test_sockets.py ......................s..........\ntests/test_tcp.py .......................s.......................................................s.sss.ssss.sss.ss..ssssssss\ntests/test_testbase.py ...\ntests/test_udp.py ..................ss...\ntests/test_unix.py ..............s.s.................\n\n=================================== FAILURES ===================================\n________________ TestAsyncio_AIO_Process.test_cancel_post_init _________________\nTraceback (most recent call last):\n  File \"/nix/store/48ak878425b9wyrkwd826d2043m3ii36-python3-3.13.11/lib/python3.13/unittest/case.py\", line 58, in testPartExecutor\n    yield\n  File \"/nix/store/48ak878425b9wyrkwd826d2043m3ii36-python3-3.13.11/lib/python3.13/unittest/case.py\", line 654, in run\n    self._callTearDown()\n    ~~~~~~~~~~~~~~~~~~^^\n  File \"/nix/store/48ak878425b9wyrkwd826d2043m3ii36-python3-3.13.11/lib/python3.13/unittest/case.py\", line 611, in _callTearDown\n    self.tearDown()\n    ~~~~~~~~~~~~~^^\n  File \"/nix/store/f10g6ix3rxlnh10aq4yrmyixgnw215lm-python3.13-uvloop-0.22.0/lib/python3.13/site-packages/uvloop/_testbase.py\", line 327, in tearDown\n    super().tearDown()\n    ~~~~~~~~~~~~~~~~^^\n  File \"/nix/store/f10g6ix3rxlnh10aq4yrmyixgnw215lm-python3.13-uvloop-0.22.0/lib/python3.13/site-packages/uvloop/_testbase.py\", line 106, in tearDown\n    self.fail('unexpected calls to loop.call_exception_handler()')\n    ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/nix/store/48ak878425b9wyrkwd826d2043m3ii36-python3-3.13.11/lib/python3.13/unittest/case.py\", line 732, in fail\n    raise self.failureException(msg)\nAssertionError: unexpected calls to loop.call_exception_handler()\n=========================== short test summary info ============================\nFAILED tests/test_process.py::TestAsyncio_AIO_Process::test_cancel_post_init - AssertionError: unexpected calls to loop.call_exception_handler()\n===== 1 failed, 405 passed, 39 skipped, 8 deselected in 157.00s (0:02:36) ======\n```\n\nDebian maintainers also discussed about this failure: https://www.mail-archive.com/debian-bugs-dist%40lists.debian.org/msg2072110.html\n\nIt won't happen every time, but about half the time.\n\npython 3.13.11 or 3.14.2\nuvloop 0.22.0","author":{"url":"https://github.com/Aleksanaa","@type":"Person","name":"Aleksanaa"},"datePublished":"2025-12-24T13:56:58.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/709/uvloop/issues/709"}