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 _______________________________________ Python tracker 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