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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Leaked semaphore objects in test_concurrent_futures","articleBody":"# Bug report\n\nConfiguration:\n```\n./configure --with-pydebug\n```\n\n```sh\n$ ./python -m test test_concurrent_futures\n0:00:00 load avg: 5.30 Run tests sequentially\n0:00:00 load avg: 5.30 [1/1] test_concurrent_futures\n/workspace/cpython/Lib/multiprocessing/popen_fork.py:66: DeprecationWarning: This process (pid=150426) is multi-threaded, use of fork() may lead to deadlocks in the child.\n  self.pid = os.fork()\n/workspace/cpython/Lib/multiprocessing/resource_tracker.py:224: UserWarning: resource_tracker: There appear to be 6 leaked semaphore objects to clean up at shutdown\n  warnings.warn('resource_tracker: There appear to be %d '\nTraceback (most recent call last):\n  File \"/workspace/cpython/Lib/multiprocessing/util.py\", line 300, in _run_finalizers\n    finalizer()\n  File \"/workspace/cpython/Lib/multiprocessing/util.py\", line 224, in __call__\n    res = self._callback(*self._args, **self._kwargs)\n          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/workspace/cpython/Lib/multiprocessing/synchronize.py\", line 87, in _cleanup\n    sem_unlink(name)\nFileNotFoundError: [Errno 2] No such file or directory\nTraceback (most recent call last):\n  File \"/workspace/cpython/Lib/multiprocessing/util.py\", line 300, in _run_finalizers\n    finalizer()\n  File \"/workspace/cpython/Lib/multiprocessing/util.py\", line 224, in __call__\n    res = self._callback(*self._args, **self._kwargs)\n          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/workspace/cpython/Lib/multiprocessing/synchronize.py\", line 87, in _cleanup\n    sem_unlink(name)\nFileNotFoundError: [Errno 2] No such file or directory\nTraceback (most recent call last):\n  File \"/workspace/cpython/Lib/multiprocessing/util.py\", line 300, in _run_finalizers\n    finalizer()\n  File \"/workspace/cpython/Lib/multiprocessing/util.py\", line 224, in __call__\n    res = self._callback(*self._args, **self._kwargs)\n          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/workspace/cpython/Lib/multiprocessing/synchronize.py\", line 87, in _cleanup\n    sem_unlink(name)\nFileNotFoundError: [Errno 2] No such file or directory\nTraceback (most recent call last):\n  File \"/workspace/cpython/Lib/multiprocessing/util.py\", line 300, in _run_finalizers\n    finalizer()\n  File \"/workspace/cpython/Lib/multiprocessing/util.py\", line 224, in __call__\n    res = self._callback(*self._args, **self._kwargs)\n          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/workspace/cpython/Lib/multiprocessing/synchronize.py\", line 87, in _cleanup\n    sem_unlink(name)\nFileNotFoundError: [Errno 2] No such file or directory\nTraceback (most recent call last):\n  File \"/workspace/cpython/Lib/multiprocessing/util.py\", line 300, in _run_finalizers\n    finalizer()\n  File \"/workspace/cpython/Lib/multiprocessing/util.py\", line 224, in __call__\n    res = self._callback(*self._args, **self._kwargs)\n          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/workspace/cpython/Lib/multiprocessing/synchronize.py\", line 87, in _cleanup\n    sem_unlink(name)\nFileNotFoundError: [Errno 2] No such file or directory\nTraceback (most recent call last):\n  File \"/workspace/cpython/Lib/multiprocessing/util.py\", line 300, in _run_finalizers\n    finalizer()\n  File \"/workspace/cpython/Lib/multiprocessing/util.py\", line 224, in __call__\n    res = self._callback(*self._args, **self._kwargs)\n          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/workspace/cpython/Lib/multiprocessing/synchronize.py\", line 87, in _cleanup\n    sem_unlink(name)\nFileNotFoundError: [Errno 2] No such file or directory\ntest_concurrent_futures passed in 2 min 17 sec\n\n== Tests result: SUCCESS ==\n\n1 test OK.\n\nTotal duration: 2 min 17 sec\nTests result: SUCCESS\n```\n\n# Your environment\n\n\u003c!-- Include as many relevant details as possible about the environment you experienced the bug in --\u003e\n\n- CPython versions tested on: CPython 3.12.0a7+\n- Operating system and architecture: Ubuntu 22.04.2 LTS | Linux-5.15.0-47-generic-x86_64-with-glibc2.35 little-endian\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-106795\n* gh-106807\n* gh-106888\n* gh-115410\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/furkanonder","@type":"Person","name":"furkanonder"},"datePublished":"2023-05-02T13:50:17.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":11},"url":"https://github.com/104090/cpython/issues/104090"}