René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"test_opcache fails randomly (failure or crash)","articleBody":"On a Free Threaded build:\n\n```\n$ ./configure --with-pydebug --disable-gil\n$ make\n$ ./python -m test test_opcache --forever -v\n```\n\nError 1 (easy to reproduce):\n\n```\nFAIL: test_load_global_module (test.test_opcache.TestRacesDoNotCrash.test_load_global_module)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/home/vstinner/python/main/Lib/test/test_opcache.py\", line 1048, in test_load_global_module\n    self.assert_races_do_not_crash(\n    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^\n        opname, get_items, read, write, check_items=True\n        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n    )\n    ^\n  File \"/home/vstinner/python/main/Lib/test/test_opcache.py\", line 590, in assert_races_do_not_crash\n    self.assert_specialized(item, opname)\n    ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^\n  File \"/home/vstinner/python/main/Lib/test/test_opcache.py\", line 23, in assert_specialized\n    self.assertIn(opname, opnames)\n    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^\nAssertionError: 'LOAD_GLOBAL_MODULE' not found in {'LOAD_GLOBAL', 'RESUME_CHECK', 'RETURN_VALUE'}\n```\n\nError 2 (crash, harder to reproduce):\n\n```\ntest_load_attr_method_with_values (test.test_opcache.TestRacesDoNotCrash.test_load_attr_method_with_values) ...\n\nFatal Python error: Segmentation fault\n\n\u003cCannot show all threads while the GIL is disabled\u003e\nStack (most recent call first):\n  File \"/home/vstinner/python/main/Lib/test/test_opcache.py\", line 913 in write\n  File \"/home/vstinner/python/main/Lib/threading.py\", line 1021 in run\n  File \"/home/vstinner/python/main/Lib/threading.py\", line 1079 in _bootstrap_inner\n  File \"/home/vstinner/python/main/Lib/threading.py\", line 1041 in _bootstrap\n\nCurrent thread's C stack trace (most recent call first):\n  Binary file \"./python\", at _Py_DumpStack+0x31 [0x6715c7]\n  Binary file \"./python\" [0x684547]\n  Binary file \"./python\" [0x6847bd]\n  Binary file \"/lib64/libc.so.6\", at +0x19df0 [0x7f95d056bdf0]\n  Binary file \"./python\", at _Py_Dealloc+0x18 [0x4e7a28]\n  Binary file \"./python\", at _Py_MergeZeroLocalRefcount+0x58 [0x4e7b3e]\n  Binary file \"./python\" [0x50f410]\n  Binary file \"./python\" [0x51db0a]\n  Binary file \"./python\", at _PyObject_GenericSetAttrWithDict+0xa3 [0x4e9e77]\n  Binary file \"./python\", at PyObject_GenericSetAttr+0xe [0x4ea0dd]\n  Binary file \"./python\", at PyObject_SetAttr+0x60 [0x4e8f5f]\n  Binary file \"./python\", at PyObject_DelAttr+0xe [0x4e92fb]\n  Binary file \"./python\", at _PyEval_EvalFrameDefault+0xed7b [0x5ce860]\n  (...)\n  \u003ctruncated rest of calls\u003e\n\nExtension modules: _testinternalcapi (total: 1)\n```\n\ncc @colesbury @nascheme \n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-133032\n* gh-133114\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/vstinner","@type":"Person","name":"vstinner"},"datePublished":"2025-04-25T14:10:25.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/132942/cpython/issues/132942"}