fromdataclassesimportdataclassfromitertoolsimportteefromtypingimportOptional# if we remove @dataclass, then no segfault@dataclassclassSomeDataClass:passclassSomeClass:# if we remove Optional, then no segfault_value:Optional[SomeDataClass]def__init__(self,it):self._it=itdefprepare_segfault(self):        (lhs,_)=tee(self._it)# if we don't assign lhs to self._it, then no segfaultself._it=lhs# if some_object isn't bound at the top-level scope, then no segfaultsome_object=SomeClass(iter("testing"))some_object.prepare_segfault()

#0  0x00007fc2c1a72e01 in teedataobject_clear (tdo=tdo@entry=0x7fc2b3ed2040) at /usr/src/debug/python3.12-3.12.1-2.fc39.x86_64/Modules/itertoolsmodule.c:836#1  0x00007fc2c1a72d49 in teedataobject_dealloc (tdo=0x7fc2b3ed2040) at /usr/src/debug/python3.12-3.12.1-2.fc39.x86_64/Modules/itertoolsmodule.c:845#2  0x00007fc2c1b06a0e in Py_DECREF (op=<optimized out>) at /usr/src/debug/python3.12-3.12.1-2.fc39.x86_64/Include/object.h:706#3  tee_clear (to=to@entry=0x7fc2b3c13b00) at /usr/src/debug/python3.12-3.12.1-2.fc39.x86_64/Modules/itertoolsmodule.c:1050#4  0x00007fc2c1b069ac in tee_dealloc (to=0x7fc2b3c13b00) at /usr/src/debug/python3.12-3.12.1-2.fc39.x86_64/Modules/itertoolsmodule.c:1059#5  0x00007fc2c1a390d8 in _Py_Dealloc (op=<optimized out>) at /usr/src/debug/python3.12-3.12.1-2.fc39.x86_64/Objects/object.c:2608#6  Py_DECREF (op=<optimized out>) at /usr/src/debug/python3.12-3.12.1-2.fc39.x86_64/Include/object.h:706#7  Py_XDECREF (op=<optimized out>) at /usr/src/debug/python3.12-3.12.1-2.fc39.x86_64/Include/object.h:799#8  _PyObject_FreeInstanceAttributes (self=0x7fc2b3daf1d0) at /usr/src/debug/python3.12-3.12.1-2.fc39.x86_64/Objects/dictobject.c:5571#9  subtype_dealloc (self=0x7fc2b3daf1d0) at /usr/src/debug/python3.12-3.12.1-2.fc39.x86_64/Objects/typeobject.c:2017#10 0x00007fc2c19f5440 in _Py_Dealloc (op=<optimized out>) at /usr/src/debug/python3.12-3.12.1-2.fc39.x86_64/Objects/object.c:2625#11 Py_DECREF (op=<optimized out>) at /usr/src/debug/python3.12-3.12.1-2.fc39.x86_64/Include/object.h:706#12 Py_XDECREF (op=<optimized out>) at /usr/src/debug/python3.12-3.12.1-2.fc39.x86_64/Include/object.h:799#13 free_keys_object (interp=0x7fc2c1df0d48 <_PyRuntime+76392>, keys=0x7fc2b3d7a100) at /usr/src/debug/python3.12-3.12.1-2.fc39.x86_64/Objects/dictobject.c:673#14 0x00007fc2c1aa72bd in dict_tp_clear (op=<optimized out>) at /usr/src/debug/python3.12-3.12.1-2.fc39.x86_64/Objects/dictobject.c:3564#15 0x00007fc2c1a02cfa in delete_garbage (old=0x7fc2c1df0e00 <_PyRuntime+76576>, collectable=0x7ffcdfc26270, gcstate=0x7fc2c1df0db8 <_PyRuntime+76504>, tstate=0x7fc2c1e4e668 <_PyRuntime+459656>)    at /usr/src/debug/python3.12-3.12.1-2.fc39.x86_64/Modules/gcmodule.c:1029#16 gc_collect_main (tstate=0x7fc2c1e4e668 <_PyRuntime+459656>, generation=generation@entry=2, n_collected=n_collected@entry=0x0, n_uncollectable=n_uncollectable@entry=0x0, nofail=nofail@entry=1)    at /usr/src/debug/python3.12-3.12.1-2.fc39.x86_64/Modules/gcmodule.c:1303#17 0x00007fc2c1abe201 in _PyGC_CollectNoFail (tstate=<optimized out>) at /usr/src/debug/python3.12-3.12.1-2.fc39.x86_64/Modules/gcmodule.c:2135#18 0x00007fc2c1aaacda in Py_FinalizeEx () at /usr/src/debug/python3.12-3.12.1-2.fc39.x86_64/Python/pylifecycle.c:1889#19 0x00007fc2c1ab96c9 in Py_RunMain () at /usr/src/debug/python3.12-3.12.1-2.fc39.x86_64/Modules/main.c:711#20 0x00007fc2c1a74f5c in Py_BytesMain (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/python3.12-3.12.1-2.fc39.x86_64/Modules/main.c:763#21 0x00007fc2c164614a in __libc_start_call_main (main=main@entry=0x56033de41160 <main>, argc=argc@entry=2, argv=argv@entry=0x7ffcdfc26698) at ../sysdeps/nptl/libc_start_call_main.h:58#22 0x00007fc2c164620b in __libc_start_main_impl (main=0x56033de41160 <main>, argc=2, argv=0x7ffcdfc26698, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffcdfc26688)    at ../csu/libc-start.c:360#23 0x000056033de41095 in _start ()