./python -m test test_free_threading -F --matchfile <matchfile>

Fatal Python error: Segmentation fault<Cannot show all threads while the GIL is disabled>Stack (most recent call first):  File "/data/users/mpage/cpython/Lib/test/test_free_threading/test_type.py", line 62 in reader_func  File "/data/users/mpage/cpython/Lib/threading.py", line 996 in run  File "/data/users/mpage/cpython/Lib/threading.py", line 1054 in _bootstrap_inner  File "/data/users/mpage/cpython/Lib/threading.py", line 1016 in _bootstrapExtension modules: _testcapi, _testinternalcapi (total: 2)

(gdb) bt#0  0x00007f528268bacc in __pthread_kill_implementation () from /lib64/libc.so.6#1  0x00007f528263e686 in raise () from /lib64/libc.so.6#2  0x000000000074168f in faulthandler_fatal_error (signum=11) at ./Modules/faulthandler.c:370#3  <signal handler called>#4  _Py_atomic_load_uint32_relaxed (obj=<optimized out>) at ./Include/cpython/pyatomic_gcc.h:367#5  _Py_TryIncrefFast (op=<unknown at remote 0x2003631fa10>) at ./Include/internal/pycore_object.h:559#6  _Py_TryIncref (op=<unknown at remote 0x2003631fa10>) at ./Include/internal/pycore_object.h:770#7  _PyType_LookupRefAndVersion (type=type@entry=0x20001184b10, name=name@entry='x', version=version@entry=0x0) at Objects/typeobject.c:5557#8  0x0000000000584b99 in _PyType_LookupRef (type=type@entry=0x20001184b10, name=name@entry='x') at Objects/typeobject.c:5649#9  0x000000000058abb9 in _Py_type_getattro_impl (type=0x20001184b10, name='x', suppress_missing_attribute=suppress_missing_attribute@entry=0x0) at Objects/typeobject.c:5827#10 0x000000000058ad19 in _Py_type_getattro (type=<optimized out>, name=<optimized out>) at Objects/typeobject.c:5878#11 0x000000000053bffb in PyObject_GetAttr (v=v@entry=<type at remote 0x20001184b10>, name='x') at Objects/object.c:1286#12 0x0000000000671470 in _PyEval_EvalFrameDefault (tstate=tstate@entry=0xb57100, frame=0x7f52824ff1c8, frame@entry=0x7f52824ff020, throwflag=throwflag@entry=0) at ./Include/internal/pycore_stackref.h:184#13 0x0000000000682b0c in _PyEval_EvalFrame (throwflag=0, frame=0x7f52824ff020, tstate=0xb57100) at ./Include/internal/pycore_ceval.h:116#14 _PyEval_Vector (tstate=<optimized out>, func=<optimized out>, locals=locals@entry=0x0, args=0x7f5268bffd08, argcount=1, kwnames=<optimized out>) at Python/ceval.c:1911#15 0x00000000004b5497 in _PyFunction_Vectorcall (func=<optimized out>, stack=<optimized out>, nargsf=<optimized out>, kwnames=<optimized out>) at Objects/call.c:413#16 0x00000000004ba119 in _PyObject_VectorcallTstate (kwnames=0x0, nargsf=1, args=0x7f5268bffd08, callable=<function at remote 0x20000b8a810>, tstate=0xb57100) at ./Include/internal/pycore_call.h:167#17 method_vectorcall (method=<optimized out>, args=<optimized out>, nargsf=<optimized out>, kwnames=0x0) at Objects/classobject.c:71#18 0x00000000004b7c52 in _PyVectorcall_Call (tstate=tstate@entry=0xb57100, func=0x4b9e87 <method_vectorcall>, callable=callable@entry=<method at remote 0x2003e2d1b70>, tuple=tuple@entry=(), kwargs=kwargs@entry=0x0)    at ./Include/object.h:783#19 0x00000000004b7fbe in _PyObject_Call (tstate=0xb57100, callable=<method at remote 0x2003e2d1b70>, args=(), kwargs=0x0) at Objects/call.c:348#20 0x00000000004b8015 in PyObject_Call (callable=<optimized out>, args=<optimized out>, kwargs=<optimized out>) at Objects/call.c:373#21 0x00000000007bac89 in thread_run (boot_raw=boot_raw@entry=0xb4a8c0) at ./Modules/_threadmodule.c:346#22 0x0000000000729cb9 in pythread_wrapper (arg=<optimized out>) at Python/thread_pthread.h:242#23 0x00007f5282689d82 in start_thread () from /lib64/libc.so.6#24 0x00007f528270ee20 in clone3 () from /lib64/libc.so.6(gdb)