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Closed
Description
Crash report
What happened?
It's possible to segfault the interpreter by calling any of the 3 functions below withMagicMock as argument. It takes a long time to trigger the crash (up to 3 minutes in my slow machine).
fromunittest.mockimportMagicMockimport_pyrepl._minimal_cursesobj=_pyrepl._minimal_curses.tparm(MagicMock(),0,0,0,0,0,0,0)obj=_pyrepl._minimal_curses.setupterm(MagicMock(),0)obj=_pyrepl._minimal_curses.tigetstr(MagicMock())
The backtrace is very long, with over 87k entries in one case. Here's part of it:
#0 0x00005555556b04e6 in compare_unicode_unicode (mp=0x0, dk=0x55556ce6f460, ep0=0x55556ce6f500, ix=38, key=0x7ffff73ae860, hash=5657245593745306375) at Objects/dictobject.c:1136#1 0x00005555556af1cb in do_lookup (mp=mp@entry=0x0, dk=dk@entry=0x55556ce6f460, key=key@entry=0x7ffff73ae860, hash=hash@entry=5657245593745306375, check_lookup=check_lookup@entry=0x5555556b04da <compare_unicode_unicode>) at Objects/dictobject.c:1066#2 0x00005555556af242 in unicodekeys_lookup_unicode (dk=dk@entry=0x55556ce6f460, key=key@entry=0x7ffff73ae860, hash=hash@entry=5657245593745306375) at Objects/dictobject.c:1151#3 0x00005555556b3c99 in _Py_dict_lookup (mp=0x7fffbe6a3c50, key=key@entry=0x7ffff73ae860, hash=hash@entry=5657245593745306375, value_addr=value_addr@entry=0x7fffff7ff0f0) at Objects/dictobject.c:1265#4 0x00005555556b4746 in _PyDict_GetItemRef_KnownHash (op=<optimized out>, key=key@entry=0x7ffff73ae860, hash=hash@entry=5657245593745306375, result=result@entry=0x7fffff7ff130) at Objects/dictobject.c:2317#5 0x00005555556ff874 in find_name_in_mro (type=type@entry=0x55556ce6cca0, name=name@entry=0x7ffff73ae860, error=error@entry=0x7fffff7ff194) at Objects/typeobject.c:5108#6 0x00005555556ffa3c in _PyType_LookupRef (type=type@entry=0x55556ce6cca0, name=name@entry=0x7ffff73ae860) at Objects/typeobject.c:5260#7 0x00005555556ca8b8 in _PyObject_GenericSetAttrWithDict (obj=obj@entry=0x7fffbe6b9920, name=0x7ffff73ae860, value=0x555555ae8100 <_Py_NoneStruct>, dict=dict@entry=0x0) at Objects/object.c:1773#8 0x00005555556cab5f in PyObject_GenericSetAttr (obj=obj@entry=0x7fffbe6b9920, name=<optimized out>, value=<optimized out>) at Objects/object.c:1849#9 0x00005555556f541e in wrap_setattr (self=0x7fffbe6b9920, args=<optimized out>, wrapped=0x5555556cab4d <PyObject_GenericSetAttr>) at Objects/typeobject.c:8792#10 0x000055555567ee41 in wrapperdescr_raw_call (descr=descr@entry=0x7ffff7b002f0, self=self@entry=0x7fffbe6b9920, args=args@entry=0x7fffc5b5bd90, kwds=kwds@entry=0x0) at Objects/descrobject.c:531#11 0x000055555567f2c5 in wrapperdescr_call (_descr=_descr@entry=0x7ffff7b002f0, args=0x7fffc5b5bd90, args@entry=0x7fffc5a48c50, kwds=kwds@entry=0x0) at Objects/descrobject.c:569#12 0x0000555555672a51 in _PyObject_MakeTpCall (tstate=tstate@entry=0x555555b564c0 <_PyRuntime+299040>, callable=callable@entry=0x7ffff7b002f0,args=args@entry=0x7ffff7e29850, nargs=<optimized out>, keywords=keywords@entry=0x0) at Objects/call.c:242#13 0x0000555555672c91 in _PyObject_VectorcallTstate (tstate=0x555555b564c0 <_PyRuntime+299040>, callable=callable@entry=0x7ffff7b002f0,args=args@entry=0x7ffff7e29850, nargsf=<optimized out>, kwnames=kwnames@entry=0x0) at ./Include/internal/pycore_call.h:166#14 0x0000555555672ce7 in PyObject_Vectorcall (callable=callable@entry=0x7ffff7b002f0, args=args@entry=0x7ffff7e29850, nargsf=<optimized out>, kwnames=kwnames@entry=0x0) at Objects/call.c:327#15 0x00005555557a293c in _PyEval_EvalFrameDefault (tstate=0x555555b564c0 <_PyRuntime+299040>, frame=0x7ffff7e297c8, throwflag=0) at Python/generated_cases.c.h:1839#16 0x00005555557b0957 in _PyEval_EvalFrame (tstate=tstate@entry=0x555555b564c0 <_PyRuntime+299040>, frame=<optimized out>, throwflag=throwflag@entry=0) at ./Include/internal/pycore_ceval.h:119#17 0x00005555557b0a76 in _PyEval_Vector (tstate=0x555555b564c0 <_PyRuntime+299040>, func=0x7ffff6a893d0, locals=locals@entry=0x0, args=0x7fffff7ff650, argcount=3, kwnames=0x0) at Python/ceval.c:1807#18 0x00005555556728a2 in _PyFunction_Vectorcall (func=<optimized out>, stack=<optimized out>, nargsf=<optimized out>, kwnames=<optimized out>) at Objects/call.c:413#19 0x00005555556f4c21 in _PyObject_VectorcallTstate (tstate=0x555555b564c0 <_PyRuntime+299040>, callable=0x7ffff6a893d0, args=0x7fffff7ff650, nargsf=3, kwnames=kwnames@entry=0x0) at ./Include/internal/pycore_call.h:168#20 0x00005555556f4cd8 in vectorcall_unbound (tstate=<optimized out>, unbound=<optimized out>, func=<optimized out>, args=<optimized out>, nargs=<optimized out>) at Objects/typeobject.c:2566#21 0x0000555555700c61 in vectorcall_method (name=<optimized out>, args=args@entry=0x7fffff7ff650, nargs=nargs@entry=3) at Objects/typeobject.c:2597
I realize these functions are implemented withctypes and internal to an internal package and hence this issue can be of very low importance. I just report in case they can point to some interesting related bug.
CPython versions tested on:
3.13, 3.14, CPython main branch
Operating systems tested on:
Linux
Output from running 'python -VV' on the command line:
Python 3.13.1+ (heads/3.13:d51c1444e36, Dec 12 2024, 11:22:09) [GCC 11.4.0]