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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`test_weakref.test_threaded_weak_key_dict_deepcopy` crash: merged objects should have ob_tid == 0","articleBody":"# Bug report\n\n```\n0:08:41 load avg: 0.10 [402/491/1] test_weakref worker non-zero exit code (Exit code 2147483651) -- running (7): test_largefile (2 min 38 sec), test_zipimport (2 min 25 sec), test_compileall (2 min 14 sec), test_dbm (1 min 54 sec), test_free_threading (2 min 32 sec), test_regrtest (1 min 36 sec), test_pathlib (2 min 44 sec)\n...\ntest.test_weakref.MappingTestCase.test_threaded_weak_key_dict_deepcopy) ... C:\\Users\\Administrator\\buildarea\\pull_request.itamaro-win64-srv-22-aws.x64.nogil\\build\\Python\\gc_free_threading.c:1081: validate_refcounts: Assertion \"op-\u003eob_tid == 0\" failed: merged objects should have ob_tid == 0\nEnable tracemalloc to get the memory block allocation traceback\n\nobject address  : 0000020002444810\nobject refcount : 0\nobject type     : 00007FFC8D8A1620\nobject type name: weakref.ReferenceType\nobject repr     : \u003crefcnt 0 at 0000020002444810\u003e\n\nFatal Python error: _PyObject_AssertFailed: _PyObject_AssertFailed\nPython runtime state: initialized\n\nStack (most recent call first):\n  File \"C:\\Users\\Administrator\\buildarea\\pull_request.itamaro-win64-srv-22-aws.x64.nogil\\build\\Lib\\test\\test_weakref.py\", line 1999 in pop_and_collect\n  File \"C:\\Users\\Administrator\\buildarea\\pull_request.itamaro-win64-srv-22-aws.x64.nogil\\build\\Lib\\threading.py\", line 1016 in run\n  File \"C:\\Users\\Administrator\\buildarea\\pull_request.itamaro-win64-srv-22-aws.x64.nogil\\build\\Lib\\threading.py\", line 1074 in _bootstrap_inner\n  File \"C:\\Users\\Administrator\\buildarea\\pull_request.itamaro-win64-srv-22-aws.x64.nogil\\build\\Lib\\threading.py\", line 1036 in _bootstrap\n```\n\nLooks like it happens during a `gc.collect()` call:\n\nhttps://github.com/python/cpython/blob/1ffe913c2017b44804aca18befd45689df06c069/Lib/test/test_weakref.py#L1992-L1999\n\nhttps://buildbot.python.org/#/builders/1295/builds/591\n\nThe test passed on retry, but this seems like a bug.\n\nSeen in main (3.15) on Windows debug build with free threading\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-135589\n* gh-135682\n* gh-135876\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/colesbury","@type":"Person","name":"colesbury"},"datePublished":"2025-06-03T21:03:35.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":12},"url":"https://github.com/135106/cpython/issues/135106"}