Closed
Description
Crash report
GC crash in subtype_dealloc when inherting from _multiprocessing.SemLock.
Reproducer (read carefully before running!):
from _multiprocessing import SemLock
class S(SemLock):
pass
s = S(1, 1, 2, 'foo', 1)Error messages
@kumaraditya303 ➜ /workspaces/cpython (main ✗) $ ./python main.py
Segmentation fault (core dumped)GDB backtrace:
#0 _PyObject_GC_UNTRACK (op=<S() at remote 0x7ffff778d480>, lineno=2242,
filename=0x5555559ae5dc "Modules/gcmodule.c") at ./Include/internal/pycore_object.h:174
#1 PyObject_GC_UnTrack (op_raw=0x7ffff778d480) at Modules/gcmodule.c:2242
#2 0x0000555555760e71 in subtype_dealloc (self=<S() at remote 0x7ffff778d480>)
at Objects/typeobject.c:1368
#3 0x0000555555742e85 in _Py_Dealloc (op=<optimized out>) at Objects/object.c:2382
#4 0x0000555555726b1b in Py_DECREF (op=<optimized out>, lineno=609,
filename=0x55555591d5dd "./Include/object.h") at ./Include/object.h:533
#5 Py_XDECREF (op=<optimized out>) at ./Include/object.h:609
#6 free_keys_object (keys=keys@entry=0x7ffff777cf70) at Objects/dictobject.c:664
#7 0x0000555555727258 in dictkeys_decref (dk=0x7ffff777cf70) at Objects/dictobject.c:324
#8 dict_dealloc (mp=0x7ffff772d490) at Objects/dictobject.c:2378
#9 0x0000555555742e85 in _Py_Dealloc (op=<optimized out>) at Objects/object.c:2382
#10 0x000055555573f7e9 in Py_DECREF (op=<optimized out>, lineno=609,
filename=0x55555591d5dd "./Include/object.h") at ./Include/object.h:533
#11 Py_XDECREF (op=<optimized out>) at ./Include/object.h:609
#12 module_dealloc (m=0x7ffff772da30) at Objects/moduleobject.c:699
#13 0x0000555555742e85 in _Py_Dealloc (op=<optimized out>) at Objects/object.c:2382
#14 0x000055555572bca7 in Py_DECREF (op=<optimized out>, lineno=609, Your environment
- CPython versions tested on: Python 3.12.0a0 da71751, Python 3.11.0b3+ f3212b1 on linux
- Operating system and architecture: Linux 5.4.0-1074-azure x86_64
cc @pablogsal
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only security fixesonly security fixesonly security fixesonly security fixesonly security fixesonly security fixesA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump