methane/segfault Secret

## segfault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Python 3.11.0a1+ (heads/main:0a4c82ddd3, Oct 19 2021, 14:30:23) [GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> xx=[]
>>> for i in range(1024):
...     xx.append([None]*(1024*1024)) # about 8 MiB
...     print(hex(id(xx[-1])))
...
0x7ffff73701e0
0x7ffff735bbb0
0x7ffff7367c50
0x7ffff73108c0
0x7ffff72ef9d0
0x7ffff735a120
0x7ffff735a210
0x7ffff735a5d0
0x7ffff735b200
0x7ffff735a4e0
0x7ffff735a670
0x7ffff735aad0
0x7ffff735a170
0x7ffff735aa30
0x7ffff735a940
0x7ffff7320960
0x7ffff742aa30
0x7ffff742b340
0x7ffff742b890
0x7ffff743f9d0
0x7ffff743f980
0x7ffff743fa20
0x7ffff743fb60
0x7ffff7371590
0x7ffff7371540
0x7ffff7371b30
0x7ffff7371b80
0x7ffff7371bd0
0x7ffff7371c20
0x7ffff7371c70
0x7ffff7371cc0
0x7ffff7371d10
0x7ffff7371d60
0x7ffff7371db0
0x7ffff7371e00
0x7ffff7371e50
0x7ffff7371ea0
0x7ffff7371ef0
0x7ffff7371f40
0x7ffff7371f90
0x7ffff7371fe0
0x7ffff7372030
0x7ffff7372080
0x7ffff73720d0
0x7ffff7372120
0x7ffff7372170
0x7ffff73721c0
0x7ffff7372210
0x7ffff7372260
0x7ffff73722b0
0x7ffff7372300
0x7ffff7372350
0x7ffff73723a0
0x7ffff73723f0
0x7ffff7372440
0x7ffff7372490
0x7ffff73724e0
0x7ffff7372530
0x7ffff7372580
0x7ffff73725d0
0x7ffff7372620
0x7ffff7372670
0x7ffff73726c0
0x7ffff7372710
0x7ffff7372760
0x7ffff73727b0
0x7ffff7372800
0x7ffff7372850
0x7ffff73728a0
0x7ffff73728f0
0x7ffff7372940
0x7ffff7372990
0x7ffff73729e0
0x7ffff7372a30
0x7ffff7372a80
0x7ffff7372ad0
0x7ffff7372b20
0x7ffff7372b70
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0x7ffff7372c60
0x7ffff7372cb0
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0x7ffff7372d50
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0x7ffff7372e40
0x7ffff7372e90
0x7ffff7372ee0
0x7ffff7372f30
0x7ffff7372f80
0x7ffff7372fd0
0x7ffff7373020
0x7ffff7373070
0x7ffff73730c0
0x7ffff7373110
0x7ffff7373160
0x7ffff73731b0
0x7ffff7373200
0x7ffff7373250
0x7ffff73732a0
0x7ffff73732f0
0x7ffff7373340
0x7ffff7373390
0x7ffff73733e0
0x7ffff7373430
0x7ffff7373480
0x7ffff73734d0
0x7ffff7373520
0x7ffff7373570
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0x7ffff7373660
0x7ffff73736b0
0x7ffff7373700
0x7ffff7373750
0x7ffff73737a0
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0x7ffff7373840
0x7ffff7373890
0x7ffff73738e0
0x7ffff7373930
0x7ffff7373980
0x7ffff73739d0
0x7ffff7373a20
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0x7ffff7373d90
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0x7ffff7373e80
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0x7ffff7373f70
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0x7ffff713c050
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0x7ffff713c2d0
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0x7ffff713c370
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0x7ffff713c4b0
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0x7ffff713c5a0
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0x7ffff713c690
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0x7ffff713c7d0
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0x7ffff713c870
0x7ffff713c8c0
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0x7ffff713c960
0x7ffff713c9b0
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0x7ffff713ca50
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0x7ffff713cb40
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0x7ffff713d040
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0x7ffff713d0e0
0x7ffff713d130
0x7ffff713d180
0x7ffff713d1d0
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0x7ffff713d270
0x7ffff713d2c0
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0x7ffff713eb20
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0x7ffff713ec60
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0x7ffff713ed50
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0x7ffff713ee40
0x7ffff713ee90
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0x7ffff713ef30
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0x7ffff713f070
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0x7ffff713f2a0
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0x7ffff713f390
0x7ffff713f3e0
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0x7ffff713f480
0x7ffff713f4d0
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0x7ffff713f570
0x7ffff713f5c0
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0x7ffff713f660
0x7ffff713f6b0
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0x7ffff713f750
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0x7ffff7140050
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0x7ffff7140690
0x7ffff71406e0
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0x7ffff7140780
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0x7ffff7140e60
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0x7ffff7141040
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0x7ffff7141130
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0x7ffff7141220
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0x7ffff7141400
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0x7ffff7141680
0x7ffff71416d0
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0x7ffff7141770
0x7ffff71417c0
0x7ffff7141810
0x7ffff7141860
0x7ffff71418b0
0x7ffff7141900
0x7ffff7141950
0x7ffff71419a0
0x7ffff71419f0
0x7ffff7141a40
0x7ffff7141a90
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0x7ffff7141c70
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0x7ffff7142030
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0x7ffff71498b0
0x7ffff7149900
0x7ffff7149950
0x7ffff71499a0
0x7ffff71499f0
0x7ffff7149a40
0x7ffff7149a90
0x7ffff7149ae0
0x7ffff7149b30
0x7ffff7149b80
0x7ffff7149bd0
0x7ffff7149c20
0x7ffff7149c70
0x7ffff7149cc0
0x7ffff7149d10
0x7ffff7149d60
0x7ffff7149db0
0x7ffff7149e00
0x7ffff7149e50
0x7ffff7149ea0
0x7ffff7149ef0
0x7ffff7149f40
0x7ffff7149f90
0x7ffff7149fe0
0x7ffff714a030
0x7ffff714a080
0x7ffff714a0d0
0x7ffff714a120
0x7ffff714a170
0x7ffff714a1c0
0x7ffff714a210
0x7ffff714a260
0x7ffff714a2b0
0x7ffff714a300
0x7ffff714a350
0x7ffff714a3a0
0x7ffff714a3f0
0x7ffff714a440
0x7ffff714a490
0x7ffff714a4e0
0x7ffff714a530
0x7ffff714a580
0x7ffff714a5d0
0x7ffff714a620
0x7ffff714a670
0x7ffff714a6c0
0x7ffff714a710
0x7ffff714a760
0x7ffff714a7b0
0x7ffff714a800
0x7ffff714a850
0x7ffff714a8a0
0x7ffff714a8f0
0x7ffff714a940
0x7ffff714a990
0x7ffff714a9e0
0x7ffff714aa30
0x7ffff714aa80
0x7ffff714aad0
0x7ffff714ab20
0x7ffff714ab70
0x7ffff714abc0
0x7ffff714ac10
0x7ffff714ac60
0x7ffff714acb0
0x7ffff714ad00
0x7ffff714ad50
0x7ffff714ada0
0x7ffff714adf0
0x7ffff714ae40
0x7ffff714ae90
0x7ffff714aee0
0x7ffff714af30
0x7ffff714af80
0x7ffff714afd0
0x7ffff714b020
0x7ffff714b070
0x7ffff714b0c0
0x7ffff714b110
0x7ffff714b160
0x7ffff714b1b0
0x7ffff714b200
0x7ffff714b250
0x7ffff714b2a0
0x7ffff714b2f0
0x7ffff714b340
0x7ffff714b390
0x7ffff714b3e0
0x7ffff714b430
0x7ffff714b480
0x7ffff714b4d0
0x7ffff714b520
0x7ffff714b570
0x7ffff714b5c0
0x7ffff714b610
0x7ffff714b660
0x7ffff714b6b0
0x7ffff714b700
0x7ffff714b750
0x7ffff714b7a0
0x7ffff714b7f0
0x7ffff714b840
0x7ffff714b890
0x7ffff714b8e0
0x7ffff714b930
0x7ffff714b980
0x7ffff714b9d0
0x7ffff714ba20
0x7ffff714ba70
0x7ffff714bac0
0x7ffff714bb10
0x7ffff714bb60
0x7ffff714bbb0
0x7ffff714bc00
0x7ffff714bc50
0x7ffff714bca0
0x7ffff714bcf0
0x7ffff714bd40
0x7ffff714bd90
0x7ffff714bde0
0x7ffff714be30
0x7ffff714be80
0x7ffff714bed0
0x7ffff714bf20
0x7ffff714bf70
0x7ffff714bfc0
0x7ffff714c050
0x7ffff714c0a0
0x7ffff714c0f0
0x7ffff714c140
0x7ffff714c190
0x7ffff714c1e0
0x7ffff714c230
0x7ffff714c280
0x7ffff714c2d0
0x7ffff714c320
0x7ffff714c370
0x7ffff714c3c0
0x7ffff714c410
0x7ffff714c460
0x7ffff714c4b0
0x7ffff714c500
0x7ffff714c550
0x7ffff714c5a0
0x7ffff714c5f0
0x7ffff714c640
0x7ffff714c690
0x7ffff714c6e0
0x7ffff714c730
0x7ffff714c780
0x7ffff714c7d0
0x7ffff714c820
0x7ffff714c870
0x7ffff714c8c0
0x7ffff714c910
0x7ffff714c960
0x7ffff714c9b0
0x7ffff714ca00
0x7ffff714ca50
0x7ffff714caa0
0x7ffff714caf0
0x7ffff714cb40
0x7ffff714cb90
0x7ffff714cbe0
0x7ffff714cc30
0x7ffff714cc80
0x7ffff714ccd0
0x7ffff714cd20
0x7ffff714cd70
0x7ffff714cdc0
0x7ffff714ce10
0x7ffff714ce60
0x7ffff714ceb0
0x7ffff714cf00
0x7ffff714cf50
0x7ffff714cfa0
0x7ffff714cff0
0x7ffff714d040
0x7ffff714d090
0x7ffff714d0e0
0x7ffff714d130
0x7ffff714d180
0x7ffff714d1d0
0x7ffff714d220
0x7ffff714d270
0x7ffff714d2c0
0x7ffff714d310
0x7ffff714d360
0x7ffff714d3b0
0x7ffff714d400
0x7ffff714d450
>>> import subprocess

Program received signal SIGSEGV, Segmentation fault.
_PyObject_IsFreed (op=op@entry=0x15555559e8400) at Objects/object.c:352
352	    if (_PyMem_IsPtrFreed(op) || _PyMem_IsPtrFreed(Py_TYPE(op))) {
(gdb) bt
#0  _PyObject_IsFreed (op=op@entry=0x15555559e8400) at Objects/object.c:352
#1  0x000055555570634a in visit_decref (op=0x15555559e8400, parent=0x7ffff7146f80) at Modules/gcmodule.c:454
#2  0x00005555555d4e03 in list_traverse (o=0x7ffff7146f80, visit=0x555555706335 <visit_decref>, arg=0x7ffff7146f80) at Objects/listobject.c:2677
#3  0x000055555570583f in subtract_refs (containers=containers@entry=0x555555a27690) at Modules/gcmodule.c:482
#4  0x00005555557070b9 in deduce_unreachable (unreachable=0x7fffffffc660, base=0x555555a27690) at Modules/gcmodule.c:1105
#5  gc_collect_main (tstate=tstate@entry=0x555555a43160, generation=generation@entry=0, n_collected=n_collected@entry=0x7fffffffc6e8, n_uncollectable=n_uncollectable@entry=0x7fffffffc6f0, nofail=nofail@entry=0) at Modules/gcmodule.c:1239
#6  0x0000555555707a36 in gc_collect_with_callback (tstate=0x555555a43160, generation=0) at Modules/gcmodule.c:1413
#7  0x0000555555707ccb in gc_collect_generations (tstate=tstate@entry=0x555555a43160) at Modules/gcmodule.c:1468
#8  0x0000555555707dde in _PyObject_GC_Alloc (use_calloc=use_calloc@entry=0, basicsize=<optimized out>) at Modules/gcmodule.c:2267
#9  0x00005555557089f8 in _PyObject_GC_Malloc (basicsize=<optimized out>) at Modules/gcmodule.c:2277
#10 0x0000555555708ab5 in _PyObject_GC_NewVar (tp=tp@entry=0x5555559eade0 <PyTuple_Type>, nitems=nitems@entry=2) at Modules/gcmodule.c:2308
#11 0x0000555555614038 in tuple_alloc (size=size@entry=2) at Objects/tupleobject.c:94
#12 0x0000555555615274 in PyTuple_New (size=size@entry=2) at Objects/tupleobject.c:153
#13 0x000055555568d33f in _PyEval_EvalFrameDefault (tstate=tstate@entry=0x555555a43160, frame=0x7ffff7fc08d0, frame@entry=0x7ffff7fc07f8, throwflag=throwflag@entry=0) at Python/ceval.c:3400
#14 0x0000555555696cb0 in _PyEval_EvalFrame (throwflag=0, frame=0x7ffff7fc07f8, tstate=0x555555a43160) at ./Include/internal/pycore_ceval.h:48
#15 _PyEval_Vector (tstate=0x555555a43160, con=<optimized out>, locals=locals@entry=0x0, args=<optimized out>, argcount=<optimized out>, kwnames=<optimized out>) at Python/ceval.c:5788
#16 0x00005555555c2512 in _PyFunction_Vectorcall (func=<optimized out>, stack=<optimized out>, nargsf=<optimized out>, kwnames=<optimized out>) at Objects/call.c:392
#17 0x0000555555803cbb in _PyObject_VectorcallTstate (kwnames=0x0, nargsf=4, args=0x7ffff7fc07d8, callable=0x7ffff72b7e30, tstate=0x555555a43160) at ./Include/internal/pycore_call.h:89
#18 method_vectorcall (method=<optimized out>, args=0x7ffff7fc07e0, nargsf=<optimized out>, kwnames=0x0) at Objects/classobject.c:54
#19 0x00005555555c324b in _PyObject_VectorcallTstate (kwnames=0x0, nargsf=9223372036854775811, args=0x7ffff7fc07e0, callable=0x7ffff7163bf0, tstate=0x555555a43160) at ./Include/internal/pycore_call.h:89
#20 PyObject_Vectorcall (callable=callable@entry=0x7ffff7163bf0, args=args@entry=0x7ffff7fc07e0, nargsf=9223372036854775811, kwnames=kwnames@entry=0x0) at Objects/call.c:298
#21 0x0000555555694ed8 in _PyEval_EvalFrameDefault (tstate=tstate@entry=0x555555a43160, frame=frame@entry=0x7ffff7fc0790, throwflag=throwflag@entry=0) at Python/ceval.c:4697
#22 0x0000555555696cb0 in _PyEval_EvalFrame (throwflag=0, frame=0x7ffff7fc0790, tstate=0x555555a43160) at ./Include/internal/pycore_ceval.h:48
#23 _PyEval_Vector (tstate=tstate@entry=0x555555a43160, con=con@entry=0x7fffffffcb30, locals=locals@entry=0x7ffff7420e30, args=args@entry=0x0, argcount=argcount@entry=0, kwnames=kwnames@entry=0x0) at Python/ceval.c:5788
#24 0x0000555555696d7f in PyEval_EvalCode (co=co@entry=0x7ffff716c840, globals=globals@entry=0x7ffff7420e30, locals=locals@entry=0x7ffff7420e30) at Python/ceval.c:1085
#25 0x0000555555850314 in builtin_exec_impl (module=module@entry=0x7ffff76e8470, source=0x7ffff716c840, globals=0x7ffff7420e30, locals=0x7ffff7420e30) at Python/bltinmodule.c:1058
#26 0x000055555585043c in builtin_exec (module=0x7ffff76e8470, args=0x7ffff7168b08, nargs=2) at Python/clinic/bltinmodule.c.h:371
#27 0x000055555581ef2a in cfunction_vectorcall_FASTCALL (func=0x7ffff76e8c50, args=0x7ffff7168b08, nargsf=<optimized out>, kwnames=<optimized out>) at Objects/methodobject.c:430
#28 0x00005555555c1faf in _PyVectorcall_Call (tstate=tstate@entry=0x555555a43160, func=0x55555581ee11 <cfunction_vectorcall_FASTCALL>, callable=callable@entry=0x7ffff76e8c50, tuple=tuple@entry=0x7ffff7168af0, kwargs=kwargs@entry=0x7ffff7421730) at ./Include/object.h:742
#29 0x00005555555c2423 in _PyObject_Call (tstate=0x555555a43160, callable=callable@entry=0x7ffff76e8c50, args=args@entry=0x7ffff7168af0, kwargs=kwargs@entry=0x7ffff7421730) at Objects/call.c:327
#30 0x00005555555c2490 in PyObject_Call (callable=callable@entry=0x7ffff76e8c50, args=args@entry=0x7ffff7168af0, kwargs=kwargs@entry=0x7ffff7421730) at Objects/call.c:354
#31 0x0000555555681f7b in do_call_core (tstate=tstate@entry=0x555555a43160, func=func@entry=0x7ffff76e8c50, callargs=callargs@entry=0x7ffff7168af0, kwdict=kwdict@entry=0x7ffff7421730, use_tracing=0) at Python/ceval.c:6585
#32 0x00005555556953e7 in _PyEval_EvalFrameDefault (tstate=tstate@entry=0x555555a43160, frame=0x7ffff7fc0710, frame@entry=0x7ffff7fc0448, throwflag=throwflag@entry=0) at Python/ceval.c:4751
#33 0x0000555555696cb0 in _PyEval_EvalFrame (throwflag=0, frame=0x7ffff7fc0448, tstate=0x555555a43160) at ./Include/internal/pycore_ceval.h:48
#34 _PyEval_Vector (tstate=0x555555a43160, con=<optimized out>, locals=locals@entry=0x0, args=<optimized out>, argcount=<optimized out>, kwnames=<optimized out>) at Python/ceval.c:5788
#35 0x00005555555c2512 in _PyFunction_Vectorcall (func=<optimized out>, stack=<optimized out>, nargsf=<optimized out>, kwnames=<optimized out>) at Objects/call.c:392
#36 0x00005555555c349f in _PyObject_VectorcallTstate (kwnames=0x0, nargsf=2, args=0x7fffffffcea0, callable=0x7ffff77203c0, tstate=0x555555a43160) at ./Include/internal/pycore_call.h:89
#37 object_vacall (tstate=tstate@entry=0x555555a43160, base=base@entry=0x0, callable=0x7ffff77203c0, vargs=vargs@entry=0x7fffffffcf20) at Objects/call.c:784
#38 0x00005555555c381b in _PyObject_CallMethodIdObjArgs (obj=0x0, name=name@entry=0x5555559f0100 <PyId__find_and_load.16895>) at Objects/call.c:875
#39 0x00005555556bb4b0 in import_find_and_load (tstate=tstate@entry=0x555555a43160, abs_name=abs_name@entry=0x7ffff75c02c0) at Python/import.c:1659
#40 0x00005555556bfe53 in PyImport_ImportModuleLevelObject (name=name@entry=0x7ffff75c02c0, globals=<optimized out>, locals=locals@entry=0x7ffff7629970, fromlist=fromlist@entry=0x5555559e8400 <_Py_NoneStruct>, level=0) at Python/import.c:1760
#41 0x000055555567d835 in import_name (tstate=tstate@entry=0x555555a43160, frame=frame@entry=0x7ffff7fc03c0, name=name@entry=0x7ffff75c02c0, fromlist=fromlist@entry=0x5555559e8400 <_Py_NoneStruct>, level=level@entry=0x7ffff763c180) at Python/ceval.c:6686
#42 0x0000555555690c01 in _PyEval_EvalFrameDefault (tstate=tstate@entry=0x555555a43160, frame=frame@entry=0x7ffff7fc03c0, throwflag=throwflag@entry=0) at Python/ceval.c:3974
#43 0x0000555555696cb0 in _PyEval_EvalFrame (throwflag=0, frame=0x7ffff7fc03c0, tstate=0x555555a43160) at ./Include/internal/pycore_ceval.h:48
#44 _PyEval_Vector (tstate=tstate@entry=0x555555a43160, con=con@entry=0x7fffffffd290, locals=locals@entry=0x7ffff7629970, args=args@entry=0x0, argcount=argcount@entry=0, kwnames=kwnames@entry=0x0) at Python/ceval.c:5788
#45 0x0000555555696d7f in PyEval_EvalCode (co=co@entry=0x7ffff7157740, globals=globals@entry=0x7ffff7629970, locals=locals@entry=0x7ffff7629970) at Python/ceval.c:1085
#46 0x0000555555850314 in builtin_exec_impl (module=module@entry=0x7ffff76e8470, source=0x7ffff7157740, globals=0x7ffff7629970, locals=0x7ffff7629970) at Python/bltinmodule.c:1058
#47 0x000055555585043c in builtin_exec (module=0x7ffff76e8470, args=0x7ffff7159c38, nargs=2) at Python/clinic/bltinmodule.c.h:371
#48 0x000055555581ef2a in cfunction_vectorcall_FASTCALL (func=0x7ffff76e8c50, args=0x7ffff7159c38, nargsf=<optimized out>, kwnames=<optimized out>) at Objects/methodobject.c:430
#49 0x00005555555c1faf in _PyVectorcall_Call (tstate=tstate@entry=0x555555a43160, func=0x55555581ee11 <cfunction_vectorcall_FASTCALL>, callable=callable@entry=0x7ffff76e8c50, tuple=tuple@entry=0x7ffff7159c20, kwargs=kwargs@entry=0x7ffff75c8590) at ./Include/object.h:742
#50 0x00005555555c2423 in _PyObject_Call (tstate=0x555555a43160, callable=callable@entry=0x7ffff76e8c50, args=args@entry=0x7ffff7159c20, kwargs=kwargs@entry=0x7ffff75c8590) at Objects/call.c:327
#51 0x00005555555c2490 in PyObject_Call (callable=callable@entry=0x7ffff76e8c50, args=args@entry=0x7ffff7159c20, kwargs=kwargs@entry=0x7ffff75c8590) at Objects/call.c:354
#52 0x0000555555681f7b in do_call_core (tstate=tstate@entry=0x555555a43160, func=func@entry=0x7ffff76e8c50, callargs=callargs@entry=0x7ffff7159c20, kwdict=kwdict@entry=0x7ffff75c8590, use_tracing=0) at Python/ceval.c:6585
#53 0x00005555556953e7 in _PyEval_EvalFrameDefault (tstate=tstate@entry=0x555555a43160, frame=0x7ffff7fc0340, frame@entry=0x7ffff7fc0078, throwflag=throwflag@entry=0) at Python/ceval.c:4751
#54 0x0000555555696cb0 in _PyEval_EvalFrame (throwflag=0, frame=0x7ffff7fc0078, tstate=0x555555a43160) at ./Include/internal/pycore_ceval.h:48
#55 _PyEval_Vector (tstate=0x555555a43160, con=<optimized out>, locals=locals@entry=0x0, args=<optimized out>, argcount=<optimized out>, kwnames=<optimized out>) at Python/ceval.c:5788
#56 0x00005555555c2512 in _PyFunction_Vectorcall (func=<optimized out>, stack=<optimized out>, nargsf=<optimized out>, kwnames=<optimized out>) at Objects/call.c:392
#57 0x00005555555c349f in _PyObject_VectorcallTstate (kwnames=0x0, nargsf=2, args=0x7fffffffd600, callable=0x7ffff77203c0, tstate=0x555555a43160) at ./Include/internal/pycore_call.h:89
#58 object_vacall (tstate=tstate@entry=0x555555a43160, base=base@entry=0x0, callable=0x7ffff77203c0, vargs=vargs@entry=0x7fffffffd680) at Objects/call.c:784
#59 0x00005555555c381b in _PyObject_CallMethodIdObjArgs (obj=0x0, name=name@entry=0x5555559f0100 <PyId__find_and_load.16895>) at Objects/call.c:875
#60 0x00005555556bb4b0 in import_find_and_load (tstate=tstate@entry=0x555555a43160, abs_name=abs_name@entry=0x7ffff75df0a0) at Python/import.c:1659
#61 0x00005555556bfe53 in PyImport_ImportModuleLevelObject (name=name@entry=0x7ffff75df0a0, globals=<optimized out>, locals=locals@entry=0x7ffff75c6ed0, fromlist=fromlist@entry=0x5555559e8400 <_Py_NoneStruct>, level=0) at Python/import.c:1760
#62 0x000055555567d835 in import_name (tstate=tstate@entry=0x555555a43160, frame=frame@entry=0x7ffff7fc0020, name=name@entry=0x7ffff75df0a0, fromlist=fromlist@entry=0x5555559e8400 <_Py_NoneStruct>, level=level@entry=0x7ffff763c180) at Python/ceval.c:6686
#63 0x0000555555690c01 in _PyEval_EvalFrameDefault (tstate=tstate@entry=0x555555a43160, frame=frame@entry=0x7ffff7fc0020, throwflag=throwflag@entry=0) at Python/ceval.c:3974
#64 0x0000555555696cb0 in _PyEval_EvalFrame (throwflag=0, frame=0x7ffff7fc0020, tstate=0x555555a43160) at ./Include/internal/pycore_ceval.h:48
#65 _PyEval_Vector (tstate=tstate@entry=0x555555a43160, con=con@entry=0x7fffffffd9f0, locals=locals@entry=0x7ffff75c6ed0, args=args@entry=0x0, argcount=argcount@entry=0, kwnames=kwnames@entry=0x0) at Python/ceval.c:5788
#66 0x0000555555696d7f in PyEval_EvalCode (co=co@entry=0x7ffff7613d40, globals=globals@entry=0x7ffff75c6ed0, locals=locals@entry=0x7ffff75c6ed0) at Python/ceval.c:1085
#67 0x00005555556de36e in run_eval_code_obj (tstate=tstate@entry=0x555555a43160, co=co@entry=0x7ffff7613d40, globals=globals@entry=0x7ffff75c6ed0, locals=locals@entry=0x7ffff75c6ed0) at Python/pythonrun.c:1292
#68 0x00005555556de867 in run_mod (mod=mod@entry=0x555555b9b250, filename=filename@entry=0x7ffff75c16c0, globals=0x7ffff75c6ed0, locals=0x7ffff75c6ed0, flags=flags@entry=0x7fffffffdc00, arena=arena@entry=0x7ffff755b160) at Python/pythonrun.c:1313
#69 0x00005555556e007f in PyRun_InteractiveOneObjectEx (fp=fp@entry=0x7ffff7e38980 <_IO_2_1_stdin_>, filename=filename@entry=0x7ffff75c16c0, flags=flags@entry=0x7fffffffdc00) at Python/pythonrun.c:277
--Type <RET> for more, q to quit, c to continue without paging--q
Quit
(gdb) py-bt
Undefined command: "py-bt".  Try "help".
(gdb) source python-gdb.py
(gdb) py-bt
Traceback (most recent call first):
  Garbage-collecting
  File "/home/inada-n/work/python/cpython/Lib/enum.py", line 777, in <listcomp>
    (name, value)
  File "/home/inada-n/work/python/cpython/Lib/enum.py", line 776, in _convert_
    members = [
  File "/home/inada-n/work/python/cpython/Lib/signal.py", line 8, in <module>
    _IntEnum._convert_(
  <built-in method exec of module object at remote 0x7ffff76e8470>
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 895, in exec_module
  File "<frozen importlib._bootstrap>", line 690, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 1149, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 1178, in _find_and_load
  File "/home/inada-n/work/python/cpython/Lib/subprocess.py", line 48, in <module>
    import signal
  <built-in method exec of module object at remote 0x7ffff76e8470>
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 895, in exec_module
  File "<frozen importlib._bootstrap>", line 690, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 1149, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 1178, in _find_and_load
  File "<stdin>", line 1, in <module>
(gdb)