René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"asyncio.Runner+PidfdChildWatcher leaves zombie processes","articleBody":"```python\r\nimport asyncio\r\nimport sys\r\nimport unittest\r\n\r\nimport asyncio\r\n\r\nasyncio.set_child_watcher(asyncio.PidfdChildWatcher())\r\n\r\n\r\ndef create_free_port():\r\n    return 4  # chosen by a fair dice roll\r\n\r\n\r\nclass TestProc(unittest.IsolatedAsyncioTestCase):\r\n    async def asyncSetUp(self):\r\n        self.port = create_free_port()\r\n        self.proc = await asyncio.create_subprocess_exec(\r\n            sys.executable,\r\n            \"-c\",  # more realistically this might be an http server or database\r\n            f\"import time; print('listening on {self.port}'); import time; time.sleep(2); print('goodbye')\",\r\n        )\r\n\r\n    async def testProc(self):\r\n        print(f\"connecting to {self.port}\")\r\n\r\n    async def asyncTearDown(self):\r\n        await self.proc.communicate()  # hangs forever on 3.11\r\n\r\n\r\nif __name__ == \"__main__\":\r\n    unittest.main()\r\n```\r\n\r\non python3.10 this produces:\r\n\r\n```\r\nconnecting to 4\r\nlistening on 4\r\ngoodbye\r\n.\r\n----------------------------------------------------------------------\r\nRan 1 test in 2.022s\r\n\r\nOK\r\n```\r\n\r\non python3.11 it hangs forever in `await self.proc.communicate()`\r\n\r\n_Originally posted by @graingert in https://github.com/python/cpython/issues/95736#issuecomment-1211736028_","author":{"url":"https://github.com/kumaraditya303","@type":"Person","name":"kumaraditya303"},"datePublished":"2022-08-11T18:48:31.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/95899/cpython/issues/95899"}