René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Free Threading] test_opcache: test_binary_subscr_list_int(): list_get_item_ref: Assertion `cap != -1 \u0026\u0026 cap \u003e= size' failed","articleBody":"test_binary_subscr_list_int() does crash randomly with an assertion error if Python is built with ``--disable-gil``:\r\n\r\n```\r\n$ ./python -m test test_opcache -v -m test_binary_subscr_list_int -j10 -F\r\n(...)\r\ntest_binary_subscr_list_int (test.test_opcache.TestRacesDoNotCrash.test_binary_subscr_list_int) ...\r\n\r\npython: Objects/listobject.c:342: list_get_item_ref: Assertion `cap != -1 \u0026\u0026 cap \u003e= size' failed.\r\nFatal Python error: Aborted\r\n\r\nThread 0x00007f244350f6c0 (most recent call first):\r\n  File \"/home/vstinner/python/main/Lib/test/test_opcache.py\", line 638 in write\r\n  File \"/home/vstinner/python/main/Lib/threading.py\", line 992 in run\r\n  File \"/home/vstinner/python/main/Lib/threading.py\", line 1041 in _bootstrap_inner\r\n  File \"/home/vstinner/python/main/Lib/threading.py\", line 1012 in _bootstrap\r\n\r\nThread 0x00007f2443d106c0 (most recent call first):\r\n  File \"/home/vstinner/python/main/Lib/test/test_opcache.py\", line 639 in write\r\n  File \"/home/vstinner/python/main/Lib/threading.py\", line 992 in run\r\n  File \"/home/vstinner/python/main/Lib/threading.py\", line 1041 in _bootstrap_inner\r\n  File \"/home/vstinner/python/main/Lib/threading.py\", line 1012 in _bootstrap\r\n\r\nCurrent thread 0x00007f2451be5740 (most recent call first):\r\n  File \"/home/vstinner/python/main/Lib/test/test_opcache.py\", line 632 in read\r\n  File \"/home/vstinner/python/main/Lib/test/test_opcache.py\", line 586 in assert_races_do_not_crash\r\n  File \"/home/vstinner/python/main/Lib/test/test_opcache.py\", line 22 in wrapper\r\n  File \"/home/vstinner/python/main/Lib/test/test_opcache.py\", line 642 in test_binary_subscr_list_int\r\n  (...)\r\n\r\nExtension modules: _testinternalcapi (total: 1)\r\n```\r\n\r\nBug seen on macOS CI, and reproduced on Linux.\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-127524\n* gh-127533\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/vstinner","@type":"Person","name":"vstinner"},"datePublished":"2024-12-02T16:34:58.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/127521/cpython/issues/127521"}