René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"test_syslog: test_syslog_threaded() crashs randomly on ARM64 macOS 3.x","articleBody":"test_syslog crashed 4 times in the last 2 days, each time in the test_syslog_threaded() function, on the \"ARM64 macOS 3.x\" buildbot:\r\n\r\n* Today: https://buildbot.python.org/all/#/builders/725/builds/2786\r\n* 2 days ago: https://buildbot.python.org/all/#/builders/725/builds/2780\r\n\r\nExample of crash:\r\n\r\n```\r\nFatal Python error: Segmentation fault\r\n\r\nThread 0x000000017bbcf000 (most recent call first):\r\n  File \"/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/test/test_syslog.py\", line 67 in logger\r\n  File \"/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/threading.py\", line 986 in run\r\n  File \"/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/threading.py\", line 1049 in _bootstrap_inner\r\n  File \"/Users/buildbot/buildarea/3.x.pablogsal-macos-m1.macos-with-brew/build/Lib/threading.pymake: *** [buildbottest] Segmentation fault: 11\r\n```\r\n\r\nThis crash is on the ``syslog.syslog()`` call in a thread. Code:\r\n\r\n```py\r\n    @threading_helper.requires_working_threading()\r\n    def test_syslog_threaded(self):\r\n        start = threading.Event()\r\n        stop = False\r\n        def opener():\r\n            start.wait(10)\r\n            i = 1\r\n            while not stop:\r\n                syslog.openlog(f'python-test-{i}')  # new string object\r\n                i += 1\r\n        def logger():\r\n            start.wait(10)\r\n            while not stop:\r\n                syslog.syslog('test message from python test_syslog') # \u003c=== HERE: line 67\r\n\r\n        orig_si = sys.getswitchinterval()\r\n        support.setswitchinterval(1e-9)\r\n        try:\r\n            threads = [threading.Thread(target=opener)]\r\n            threads += [threading.Thread(target=logger) for k in range(10)]\r\n            with threading_helper.start_threads(threads):\r\n                start.set()\r\n                time.sleep(0.1)\r\n                stop = True\r\n        finally:\r\n            sys.setswitchinterval(orig_si)\r\n```","author":{"url":"https://github.com/vstinner","@type":"Person","name":"vstinner"},"datePublished":"2022-10-11T07:17:10.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":31},"url":"https://github.com/98178/cpython/issues/98178"}