Sebastien Renard added the comment:
Hello,
I encounter a quite similar issue with python 3.4.0 and cx_Oracle. It segfault
from time to time (hard to reproduce) on visit_decref at Modules/gcmodule.c:373.
There were no issue with python 2.7. I did not test with 3.3.
With gdb i got the following stacktrace :
(gdb) info threads
Id Target Id Frame
* 1 Thread 0x7ffff7fc6740 (LWP 7415) "python3" visit_decref (op=0xb00000000,
data=data@entry=0x0) at Modules/gcmodule.c:373
(gdb) backtrace
#0 visit_decref (op=0xb00000000, data=data@entry=0x0) at Modules/gcmodule.c:373
#1 0x00000000004318da in BaseException_traverse (self=0x7ffff1624888,
visit=0x504660 <visit_decref>, arg=0x0) at Objects/exceptions.c:97
#2 0x0000000000504925 in subtract_refs (containers=<optimized out>) at
Modules/gcmodule.c:398
#3 collect (generation=generation@entry=0,
n_collected=n_collected@entry=0x7fffffffbd60,
n_uncollectable=n_uncollectable@entry=0x7fffffffbd68, nofail=nofail@entry=0) at
Modules/gcmodule.c:957
#4 0x0000000000505573 in collect_with_callback (generation=0) at
Modules/gcmodule.c:1128
#5 collect_generations () at Modules/gcmodule.c:1151
#6 0x0000000000505cd1 in _PyObject_GC_Malloc (basicsize=<optimized out>) at
Modules/gcmodule.c:1726
#7 _PyObject_GC_Malloc (basicsize=<optimized out>) at Modules/gcmodule.c:1743
#8 _PyObject_GC_NewVar (tp=tp@entry=0x810400 <PyTuple_Type>,
nitems=nitems@entry=11) at Modules/gcmodule.c:1753
#9 0x000000000046470c in PyTuple_New (size=11) at Objects/tupleobject.c:104
#10 0x0000000000464e05 in PyTuple_New (size=size@entry=11) at
Objects/tupleobject.c:122
#11 0x00007ffff582e881 in Cursor_CreateRow (self=self@entry=0x7ffff1603290) at
Cursor.c:1095
#12 0x00007ffff582f18f in Cursor_MultiFetch (self=0x7ffff1603290, rowLimit=0)
at Cursor.c:1883
#13 0x00000000004c4aa7 in call_function (oparg=<optimized out>,
pp_stack=0x7fffffffbfb0) at Python/ceval.c:4210
#14 PyEval_EvalFrameEx (f=f@entry=0xab5208, throwflag=throwflag@entry=0) at
Python/ceval.c:2829
#15 0x00000000004be47b in PyEval_EvalCodeEx (_co=<optimized out>,
globals=<optimized out>, locals=locals@entry=0x0, args=<optimized out>,
argcount=argcount@entry=3, kws=0x7ffff11c3ad8, kwcount=0, defs=0x7ffff5a635a0,
defcount=1, kwdefs=0x0,
closure=0x0) at Python/ceval.c:3578
#16 0x00000000004c3d91 in fast_function (nk=<optimized out>, na=3, n=<optimized
out>, pp_stack=0x7fffffffc240, func=0x7ffff1e98b70) at Python/ceval.c:4334
#17 call_function (oparg=<optimized out>, pp_stack=0x7fffffffc240) at
Python/ceval.c:4252
#18 PyEval_EvalFrameEx (f=f@entry=0x7ffff11c3930, throwflag=throwflag@entry=0)
at Python/ceval.c:2829
#19 0x00000000004be47b in PyEval_EvalCodeEx (_co=<optimized out>,
globals=<optimized out>, locals=locals@entry=0x0, args=<optimized out>,
argcount=argcount@entry=2, kws=0xbf7610, kwcount=1, defs=0x7ffff1eb14c0,
defcount=1, kwdefs=0x0,
closure=0x0) at Python/ceval.c:3578
#20 0x00000000004c3d91 in fast_function (nk=<optimized out>, na=2, n=<optimized
out>, pp_stack=0x7fffffffc4d0, func=0x7ffff160b510) at Python/ceval.c:4334
#21 call_function (oparg=<optimized out>, pp_stack=0x7fffffffc4d0) at
Python/ceval.c:4252
#22 PyEval_EvalFrameEx (f=<optimized out>, throwflag=throwflag@entry=0) at
Python/ceval.c:2829
#23 0x00000000004c5e85 in fast_function (nk=<optimized out>, na=2, n=2,
pp_stack=0x7fffffffc6b0, func=0x7ffff1634d08) at Python/ceval.c:4324
#24 call_function (oparg=<optimized out>, pp_stack=0x7fffffffc6b0) at
Python/ceval.c:4252
#25 PyEval_EvalFrameEx (f=<optimized out>, throwflag=throwflag@entry=0) at
Python/ceval.c:2829
#26 0x00000000004c5e85 in fast_function (nk=<optimized out>, na=2, n=2,
pp_stack=0x7fffffffc890, func=0x7ffff2513730) at Python/ceval.c:4324
#27 call_function (oparg=<optimized out>, pp_stack=0x7fffffffc890) at
Python/ceval.c:4252
#28 PyEval_EvalFrameEx (f=<optimized out>, throwflag=throwflag@entry=0) at
Python/ceval.c:2829
#29 0x00000000004c5e85 in fast_function (nk=<optimized out>, na=2, n=2,
pp_stack=0x7fffffffca70, func=0x7ffff1633378) at Python/ceval.c:4324
#30 call_function (oparg=<optimized out>, pp_stack=0x7fffffffca70) at
Python/ceval.c:4252
---Type <return> to continue, or q <return> to quit---
#31 PyEval_EvalFrameEx (f=<optimized out>, throwflag=throwflag@entry=0) at
Python/ceval.c:2829
#32 0x00000000004c5e85 in fast_function (nk=<optimized out>, na=2, n=2,
pp_stack=0x7fffffffcc50, func=0x7ffff1635d90) at Python/ceval.c:4324
#33 call_function (oparg=<optimized out>, pp_stack=0x7fffffffcc50) at
Python/ceval.c:4252
#34 PyEval_EvalFrameEx (f=<optimized out>, throwflag=throwflag@entry=0) at
Python/ceval.c:2829
#35 0x00000000004c5e85 in fast_function (nk=<optimized out>, na=2, n=2,
pp_stack=0x7fffffffce30, func=0x7ffff2513730) at Python/ceval.c:4324
#36 call_function (oparg=<optimized out>, pp_stack=0x7fffffffce30) at
Python/ceval.c:4252
#37 PyEval_EvalFrameEx (f=<optimized out>, throwflag=throwflag@entry=0) at
Python/ceval.c:2829
#38 0x00000000004c5e85 in fast_function (nk=<optimized out>, na=2, n=2,
pp_stack=0x7fffffffd010, func=0x7ffff1633378) at Python/ceval.c:4324
#39 call_function (oparg=<optimized out>, pp_stack=0x7fffffffd010) at
Python/ceval.c:4252
#40 PyEval_EvalFrameEx (f=f@entry=0xab9478, throwflag=throwflag@entry=0) at
Python/ceval.c:2829
#41 0x00000000004be47b in PyEval_EvalCodeEx (_co=<optimized out>,
globals=<optimized out>, locals=locals@entry=0x0, args=<optimized out>,
argcount=argcount@entry=1, kws=0xab9380, kwcount=0, defs=0x7ffff2504b88,
defcount=1, kwdefs=0x0,
closure=0x0) at Python/ceval.c:3578
#42 0x00000000004c3d91 in fast_function (nk=<optimized out>, na=1, n=<optimized
out>, pp_stack=0x7fffffffd2a0, func=0x7ffff2513400) at Python/ceval.c:4334
#43 call_function (oparg=<optimized out>, pp_stack=0x7fffffffd2a0) at
Python/ceval.c:4252
#44 PyEval_EvalFrameEx (f=<optimized out>, throwflag=throwflag@entry=0) at
Python/ceval.c:2829
#45 0x00000000004c5e85 in fast_function (nk=<optimized out>, na=1, n=1,
pp_stack=0x7fffffffd480, func=0x7ffff16331e0) at Python/ceval.c:4324
#46 call_function (oparg=<optimized out>, pp_stack=0x7fffffffd480) at
Python/ceval.c:4252
#47 PyEval_EvalFrameEx (f=<optimized out>, throwflag=throwflag@entry=0) at
Python/ceval.c:2829
#48 0x00000000004c5e85 in fast_function (nk=<optimized out>, na=0, n=0,
pp_stack=0x7fffffffd660, func=0x7ffff6ed4d08) at Python/ceval.c:4324
#49 call_function (oparg=<optimized out>, pp_stack=0x7fffffffd660) at
Python/ceval.c:4252
#50 PyEval_EvalFrameEx (f=f@entry=0x7ffff7eceaf8, throwflag=throwflag@entry=0)
at Python/ceval.c:2829
#51 0x00000000004be47b in PyEval_EvalCodeEx (_co=_co@entry=0x7ffff6ed14b0,
globals=globals@entry=0x7ffff7ef1388, locals=locals@entry=0x7ffff7ef1388,
args=args@entry=0x0, argcount=argcount@entry=0, kws=kws@entry=0x0,
kwcount=kwcount@entry=0,
defs=defs@entry=0x0, defcount=defcount@entry=0, kwdefs=kwdefs@entry=0x0,
closure=closure@entry=0x0) at Python/ceval.c:3578
#52 0x00000000004be54b in PyEval_EvalCode (co=co@entry=0x7ffff6ed14b0,
globals=globals@entry=0x7ffff7ef1388, locals=locals@entry=0x7ffff7ef1388) at
Python/ceval.c:773
#53 0x00000000004ed844 in run_mod (arena=0x8fea30, flags=0x7fffffffd910,
locals=0x7ffff7ef1388, globals=0x7ffff7ef1388, filename=0x7ffff7ea7a78,
mod=0x97c090) at Python/pythonrun.c:2175
#54 PyRun_InteractiveOneObject (fp=fp@entry=0x7ffff74b6340 <_IO_2_1_stdin_>,
filename=filename@entry=0x7ffff7ea7a78, flags=flags@entry=0x7fffffffd910) at
Python/pythonrun.c:1441
#55 0x00000000004edb7e in PyRun_InteractiveLoopFlags
(fp=fp@entry=0x7ffff74b6340 <_IO_2_1_stdin_>,
filename_str=filename_str@entry=0x580d63 "<stdin>",
flags=flags@entry=0x7fffffffd910) at Python/pythonrun.c:1320
#56 0x00000000004edcd6 in PyRun_AnyFileExFlags (fp=fp@entry=0x7ffff74b6340
<_IO_2_1_stdin_>, filename=<optimized out>, closeit=0,
flags=flags@entry=0x7fffffffd910) at Python/pythonrun.c:1282
#57 0x000000000041e243 in run_file (p_cf=0x7fffffffd910, filename=0x0,
fp=0x7ffff74b6340 <_IO_2_1_stdin_>) at Modules/main.c:319
#58 Py_Main (argc=argc@entry=1, argv=argv@entry=0x872010) at Modules/main.c:751
#59 0x000000000041aacc in main (argc=1, argv=<optimized out>) at
./Modules/python.c:69
(gdb)
Regards
----------
nosy: +sebastien.renard
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Python tracker <[email protected]>
<http://bugs.python.org/issue20526>
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