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test_weakref.test_threaded_weak_key_dict_deepcopy crash: merged objects should have ob_tid == 0 #135106

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3.14bugs and security fixes3.15new features, bugs and security fixesrelease-blockertestsTests in the Lib/test dirtopic-free-threadingtype-bugAn unexpected behavior, bug, or error
@colesbury

Description

@colesbury

Bug report

0:08:41 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)...test.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->ob_tid == 0" failed: merged objects should have ob_tid == 0Enable tracemalloc to get the memory block allocation tracebackobject address  : 0000020002444810object refcount : 0object type     : 00007FFC8D8A1620object type name: weakref.ReferenceTypeobject repr     : <refcnt 0 at 0000020002444810>Fatal Python error: _PyObject_AssertFailed: _PyObject_AssertFailedPython runtime state: initializedStack (most recent call first):  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  File "C:\Users\Administrator\buildarea\pull_request.itamaro-win64-srv-22-aws.x64.nogil\build\Lib\threading.py", line 1016 in run  File "C:\Users\Administrator\buildarea\pull_request.itamaro-win64-srv-22-aws.x64.nogil\build\Lib\threading.py", line 1074 in _bootstrap_inner  File "C:\Users\Administrator\buildarea\pull_request.itamaro-win64-srv-22-aws.x64.nogil\build\Lib\threading.py", line 1036 in _bootstrap

Looks like it happens during agc.collect() call:

defpop_and_collect(lst):
gc_ctr=0
whilelst:
i=random.randint(0,len(lst)-1)
gc_ctr+=1
lst.pop(i)
ifgc_ctr%10000==0:
gc.collect()# just in case

https://buildbot.python.org/#/builders/1295/builds/591

The test passed on retry, but this seems like a bug.

Seen in main (3.15) on Windows debug build with free threading

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    3.14bugs and security fixes3.15new features, bugs and security fixesrelease-blockertestsTests in the Lib/test dirtopic-free-threadingtype-bugAn unexpected behavior, bug, or error

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