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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Intermittent iOS buildbot failure in test_sock_client_racing","articleBody":"# Bug report\n\n### Bug description:\n\nThis is failing on about 10% of attempts. Usually it passes on a rerun:\n* https://buildbot.python.org/#/builders/1380/builds/6364\n* https://buildbot.python.org/#/builders/1380/builds/6374\n\nBut sometimes it fails on the rerun:\n* https://buildbot.python.org/#/builders/1380/builds/6331\n* https://buildbot.python.org/#/builders/1380/builds/6403\n\n```\n ERROR: test_sock_client_racing (test.test_asyncio.test_sock_lowlevel.KqueueEventLoopTests.test_sock_client_racing)\n ----------------------------------------------------------------------\n Traceback (most recent call last):\n   File \"/Users/buildbot/Library/Developer/CoreSimulator/Devices/4F9AFDE7-A49A-46AD-B161-FCA22E48EA55/data/Containers/Bundle/Application/3DAA3568-C09B-454E-9E2B-4749EEB89567/iOSTestbed.app/python/lib/python3.15/test/test_asyncio/test_sock_lowlevel.py\", line 273, in test_sock_client_racing\n     self.loop.run_until_complete(asyncio.wait_for(\n     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^\n         self._basetest_sock_send_racing(listener, sock), 10))\n         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n   File \"/Users/buildbot/Library/Developer/CoreSimulator/Devices/4F9AFDE7-A49A-46AD-B161-FCA22E48EA55/data/Containers/Bundle/Application/3DAA3568-C09B-454E-9E2B-4749EEB89567/iOSTestbed.app/python/lib/python3.15/asyncio/base_events.py\", line 724, in run_until_complete\n     return future.result()\n            ~~~~~~~~~~~~~^^\n   File \"/Users/buildbot/Library/Developer/CoreSimulator/Devices/4F9AFDE7-A49A-46AD-B161-FCA22E48EA55/data/Containers/Bundle/Application/3DAA3568-C09B-454E-9E2B-4749EEB89567/iOSTestbed.app/python/lib/python3.15/asyncio/tasks.py\", line 488, in wait_for\n     return await fut\n            ^^^^^^^^^\n   File \"/Users/buildbot/Library/Developer/CoreSimulator/Devices/4F9AFDE7-A49A-46AD-B161-FCA22E48EA55/data/Containers/Bundle/Application/3DAA3568-C09B-454E-9E2B-4749EEB89567/iOSTestbed.app/python/lib/python3.15/test/test_asyncio/test_sock_lowlevel.py\", line 196, in _basetest_sock_send_racing\n     sock.send(b' ' * size)\n     ~~~~~~~~~^^^^^^^^^^^^^\n ConnectionResetError: [Errno 54] Connection reset by peer\n```\n\n@freakboy3742: FYI\n\n\n### CPython versions tested on:\n\nCPython main branch\n\n### Operating systems tested on:\n\nOther","author":{"url":"https://github.com/mhsmith","@type":"Person","name":"mhsmith"},"datePublished":"2026-04-20T11:58:57.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/148793/cpython/issues/148793"}