[Python-Dev] Need help in debugging the python core

Fri Sep 2 14:42:39 EDT 2016

You are using bash?
On Sep 2, 2016 8:56 AM, "Sajjanshetty, Amresh" <
Amresh.Sajjanshetty at netapp.com> wrote:

> Dear All,
>
>
>
> I’m using asyncio and paramiko to multiplex different channels into a
> single SSH connection. Things were working fine till recently but suddenly
> started seeing that python getting crashed whenever I tried to write to the
> channel. I have very limited knowledge on how python interpreter works, so
> I’m finding difficulty in understanding the stack trace. Can you please
> help in understanding the below backtarce.
>
>
>
> bash-4.2$ gdb /usr/software/bin/python3.4.3 core.60015
>
> Traceback (most recent call last):
>
>   File "<string>", line 70, in <module>
>
>   File "<string>", line 67, in GdbSetPythonDirectory
>
>   File "/usr/software/share/gdb/python/gdb/__init__.py", line 19, in
> <module>
>
>     import _gdb
>
> ImportError: No module named _gdb
>
> GNU gdb (GDB) 7.5
>
> Copyright (C) 2012 Free Software Foundation, Inc.
>
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.
> html>
>
> This is free software: you are free to change and redistribute it.
>
> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
>
> and "show warranty" for details.
>
> This GDB was configured as "x86_64-unknown-linux-gnu".
>
> For bug reporting instructions, please see:
>
> <http://www.gnu.org/software/gdb/bugs/>...
>
> Reading symbols from /usr/software/bin/python3.4.3...done.
>
>
>
> warning: core file may not match specified executable file.
>
> [New LWP 60015]
>
> [New LWP 60018]
>
> [New LWP 60019]
>
> [New LWP 60020]
>
> [New LWP 60021]
>
> [New LWP 60022]
>
> [New LWP 60023]
>
> [New LWP 60024]
>
> [Thread debugging using libthread_db enabled]
>
> Using host libthread_db library "/usr/software/lib/libthread_db.so.1".
>
> Core was generated by `/usr/software/bin/python3.4.3
> /x/eng/bbrtp/users/amresh/sshproxy_3896926_160824'.
>
> Program terminated with signal 11, Segmentation fault.
>
> #0  _PyObject_Malloc (ctx=0x0, nbytes=52) at Objects/obmalloc.c:1159
>
> 1159    Objects/obmalloc.c: No such file or directory.
>
> (gdb) bt
>
> #0  _PyObject_Malloc (ctx=0x0, nbytes=52) at Objects/obmalloc.c:1159
>
> #1  0x00007ff2e511474a in PyUnicode_New (maxchar=<optimized out>, size=3)
> at Objects/unicodeobject.c:1093
>
> #2  PyUnicode_New (size=3, maxchar=<optimized out>) at
> Objects/unicodeobject.c:1033
>
> #3  0x00007ff2e5139da2 in _PyUnicodeWriter_PrepareInternal
> (writer=writer at entry=0x7fff3d5c8640, length=<optimized out>,
> maxchar=<optimized out>, maxchar at entry=127) at
> Objects/unicodeobject.c:13327
>
> #4  0x00007ff2e513f38b in PyUnicode_DecodeUTF8Stateful (s=s at entry=0x7ff2e3572f78
> "tcp\245reuse\001\253socket_type\244pull\251transport\246zeromq",
> size=size at entry=3,
>
>     errors=errors at entry=0x7ff2dee5dd70 "strict", consumed=consumed at entry=0x0)
> at Objects/unicodeobject.c:4757
>
> #5  0x00007ff2e5140690 in PyUnicode_Decode (s=0x7ff2e3572f78
> "tcp\245reuse\001\253socket_type\244pull\251transport\246zeromq", size=3,
> encoding=0x7ff2dee5df28 "utf-8", errors=0x7ff2dee5dd70 "strict")
>
>     at Objects/unicodeobject.c:3012
>
> #6  0x00007ff2de49bfdf in unpack_callback_raw (o=<synthetic pointer>, l=3,
> p=0x7ff2e3572f78 "tcp\245reuse\001\253socket_type\244pull\251transport\246zeromq",
> u=0x7fff3d5c8840, b=<optimized out>)
>
>     at msgpack/unpack.h:229
>
> #7  unpack_execute<true> (ctx=ctx at entry=0x7fff3d5c8840,
> data=0x7ff2e3572ec0 "\205\245_auth\300\245_call\246expect\243_i",
> <incomplete sequence \332>, len=<optimized out>, off=off at entry
> =0x7fff3d5c8820)
>
>     at msgpack/unpack_template.h:312
>
> #8  0x00007ff2de49fe3d in __pyx_pf_7msgpack_9_unpacker_2unpackb
> (__pyx_v_packed=__pyx_v_packed at entry=0x7ff2e3572ea0,
> __pyx_v_object_hook=__pyx_v_object_hook at entry=0x7ff2e54934b0
> <_Py_NoneStruct>,
>
>     __pyx_v_list_hook=__pyx_v_list_hook at entry=0x7ff2e54934b0
> <_Py_NoneStruct>, __pyx_v_use_list=1, __pyx_v_encoding=0x7ff2dee5df08,
> __pyx_v_unicode_errors=0x7ff2dee5dd50,
>
>     __pyx_v_object_pairs_hook=0x7ff2e54934b0 <_Py_NoneStruct>,
> __pyx_v_ext_hook=0x13db2d8, __pyx_v_max_str_len=__pyx_v_max_str_len at entry=
> 2147483647,
>
>     __pyx_v_max_bin_len=__pyx_v_max_bin_len at entry=2147483647,
> __pyx_v_max_array_len=2147483647, __pyx_v_max_map_len=2147483647,
> __pyx_v_max_ext_len=__pyx_v_max_ext_len at entry=2147483647,
>
>     __pyx_self=<optimized out>) at msgpack/_unpacker.pyx:139
>
> #9  0x00007ff2de4a1395 in __pyx_pw_7msgpack_9_unpacker_3unpackb
> (__pyx_self=<optimized out>, __pyx_args=<optimized out>,
> __pyx_kwds=<optimized out>) at msgpack/_unpacker.pyx:102
>
> #10 0x00007ff2e5174ed3 in do_call (nk=<optimized out>, na=<optimized out>,
> pp_stack=0x7fff3d5d2b80, func=0x7ff2df20ddc8) at Python/ceval.c:4463
>
> #11 call_function (oparg=<optimized out>, pp_stack=0x7fff3d5d2b80) at
> Python/ceval.c:4264
>
> #12 PyEval_EvalFrameEx (f=f at entry=0x7ff2def02208,
> throwflag=throwflag at entry=0) at Python/ceval.c:2838
>
> #13 0x00007ff2e5175f45 in PyEval_EvalCodeEx (_co=<optimized out>,
> globals=<optimized out>, locals=locals at entry=0x0, args=<optimized out>,
> argcount=argcount at entry=1, kws=0x7ff2deefec30, kwcount=0, defs=0x0,
>
>     defcount=0, kwdefs=0x0, closure=0x0) at Python/ceval.c:3588
>
> #14 0x00007ff2e51734da in fast_function (nk=<optimized out>, na=1,
> n=<optimized out>, pp_stack=0x7fff3d5d2e10, func=0x7ff2dee9b7b8) at
> Python/ceval.c:4344
>
> #15 call_function (oparg=<optimized out>, pp_stack=0x7fff3d5d2e10) at
> Python/ceval.c:4262
>
> #16 PyEval_EvalFrameEx (f=f at entry=0x7ff2deefea98,
> throwflag=throwflag at entry=0) at Python/ceval.c:2838
>
> #17 0x00007ff2e5175f45 in PyEval_EvalCodeEx (_co=<optimized out>,
> globals=<optimized out>, locals=locals at entry=0x0, args=<optimized out>,
> argcount=argcount at entry=1, kws=0x14566c8, kwcount=0,
>
>     defs=0x7ff2deeaedb8, defcount=1, kwdefs=0x0, closure=0x0) at
> Python/ceval.c:3588
>
> #18 0x00007ff2e51734da in fast_function (nk=<optimized out>, na=1,
> n=<optimized out>, pp_stack=0x7fff3d5d30a0, func=0x7ff2dee2dd90) at
> Python/ceval.c:4344
>
> #19 call_function (oparg=<optimized out>, pp_stack=0x7fff3d5d30a0) at
> Python/ceval.c:4262
>
> #20 PyEval_EvalFrameEx (f=f at entry=0x1456478, throwflag=throwflag at entry=0)
> at Python/ceval.c:2838
>
> #21 0x00007ff2e5175f45 in PyEval_EvalCodeEx (_co=<optimized out>,
> globals=<optimized out>, locals=locals at entry=0x0, args=args at entry=0x7ff2d87364c0,
> argcount=1, kws=kws at entry=0x7ff2dee1de40,
>
>     kwcount=kwcount at entry=3, defs=defs at entry=0x7ff2e0820fd8,
> defcount=defcount at entry=3, kwdefs=0x0, closure=0x0) at Python/ceval.c:3588
>
> #22 0x00007ff2e50d3320 in function_call (func=0x7ff2df1e9a60,
> arg=0x7ff2d87364a8, kw=0x7ff2d8738248) at Objects/funcobject.c:632
>
> #23 0x00007ff2e50a76ca in PyObject_Call (func=func at entry=0x7ff2df1e9a60,
> arg=arg at entry=0x7ff2d87364a8, kw=kw at entry=0x7ff2d8738248) at
> Objects/abstract.c:2040
>
> #24 0x00007ff2e50be55d in method_call (func=0x7ff2df1e9a60,
> arg=0x7ff2d87364a8, kw=0x7ff2d8738248) at Objects/classobject.c:347
>
> #25 0x00007ff2e50a76ca in PyObject_Call (func=0x7ff2dee30e88, arg=arg at entry=0x7ff2e433d048,
> kw=kw at entry=0x7ff2d8738248) at Objects/abstract.c:2040
>
> #26 0x00007ff2e51d9301 in partial_call (pto=0x7ff2deee1db8,
> args=<optimized out>, kw=0x0) at ./Modules/_functoolsmodule.c:127
>
> #27 0x00007ff2e50a76ca in PyObject_Call (func=func at entry=0x7ff2deee1db8,
> arg=arg at entry=0x7ff2e433d048, kw=kw at entry=0x0) at Objects/abstract.c:2040
>
> #28 0x00007ff2e51700a0 in ext_do_call (nk=-466366392, na=0,
> flags=<optimized out>, pp_stack=0x7fff3d5d3540, func=0x7ff2deee1db8) at
> Python/ceval.c:4561
>
> #29 PyEval_EvalFrameEx (f=<optimized out>, throwflag=throwflag at entry=0)
> at Python/ceval.c:2878
>
> #30 0x00007ff2e51756a9 in fast_function (nk=<optimized out>, na=1, n=1,
> pp_stack=0x7fff3d5d3710, func=0x7ff2e1540730) at Python/ceval.c:4334
>
> #31 call_function (oparg=<optimized out>, pp_stack=0x7fff3d5d3710) at
> Python/ceval.c:4262
>
> #32 PyEval_EvalFrameEx (f=<optimized out>, throwflag=throwflag at entry=0)
> at Python/ceval.c:2838
>
> #33 0x00007ff2e51756a9 in fast_function (nk=<optimized out>, na=1, n=1,
> pp_stack=0x7fff3d5d38f0, func=0x7ff2e12f2f28) at Python/ceval.c:4334
>
> #34 call_function (oparg=<optimized out>, pp_stack=0x7fff3d5d38f0) at
> Python/ceval.c:4262
>
> #35 PyEval_EvalFrameEx (f=<optimized out>, throwflag=throwflag at entry=0)
> at Python/ceval.c:2838
>
> #36 0x00007ff2e51756a9 in fast_function (nk=<optimized out>, na=1, n=1,
> pp_stack=0x7fff3d5d3ad0, func=0x7ff2e12f0c80) at Python/ceval.c:4334
>
> #37 call_function (oparg=<optimized out>, pp_stack=0x7fff3d5d3ad0) at
> Python/ceval.c:4262
>
> #38 PyEval_EvalFrameEx (f=<optimized out>, throwflag=throwflag at entry=0)
> at Python/ceval.c:2838
>
> #39 0x00007ff2e51756a9 in fast_function (nk=<optimized out>, na=1, n=1,
> pp_stack=0x7fff3d5d3cb0, func=0x7ff2df1e9ae8) at Python/ceval.c:4334
>
> #40 call_function (oparg=<optimized out>, pp_stack=0x7fff3d5d3cb0) at
> Python/ceval.c:4262
>
> #41 PyEval_EvalFrameEx (f=f at entry=0xf796b8, throwflag=throwflag at entry=0)
> at Python/ceval.c:2838
>
> #42 0x00007ff2e5175f45 in PyEval_EvalCodeEx (_co=_co at entry=0x7ff2e400c660,
> globals=globals at entry=0x7ff2e42df488, locals=locals at entry=0x7ff2e42df488,
> args=args at entry=0x0, argcount=argcount at entry=0,
>
>     kws=kws at entry=0x0, kwcount=kwcount at entry=0, defs=defs at entry=0x0,
> defcount=defcount at entry=0, kwdefs=kwdefs at entry=0x0, closure=closure at entry=0x0)
> at Python/ceval.c:3588
>
> #43 0x00007ff2e517601b in PyEval_EvalCode (co=co at entry=0x7ff2e400c660,
> globals=globals at entry=0x7ff2e42df488, locals=locals at entry=0x7ff2e42df488)
> at Python/ceval.c:775
>
> #44 0x00007ff2e519c09e in run_mod (arena=0xfc2990, flags=0x7fff3d5d3f50,
> locals=0x7ff2e42df488, globals=0x7ff2e42df488, filename=0x7ff2e41d64b0,
> mod=0x103b4f0) at Python/pythonrun.c:2180
>
> #45 PyRun_FileExFlags (fp=fp at entry=0xf77b60, filename_str=filename_str at entry=0x7ff2e41d81d0
> "/x/eng/bbrtp/users/amresh/sshproxy_3896926_1608240818/
> test/nate/lib/NATE/Service/SSHProxy.py",
>
>     start=start at entry=257, globals=globals at entry=0x7ff2e42df488,
> locals=locals at entry=0x7ff2e42df488, closeit=closeit at entry=1,
> flags=flags at entry=0x7fff3d5d3f50) at Python/pythonrun.c:2133
>
> #46 0x00007ff2e519ced5 in PyRun_SimpleFileExFlags (fp=fp at entry=0xf77b60,
> filename=<optimized out>, closeit=closeit at entry=1, flags=flags at entry=0x7fff3d5d3f50)
> at Python/pythonrun.c:1606
>
> ---Type <return> to continue, or q <return> to quit---
>
> #47 0x00007ff2e519df09 in PyRun_AnyFileExFlags (fp=fp at entry=0xf77b60,
> filename=<optimized out>, closeit=closeit at entry=1, flags=flags at entry=0x7fff3d5d3f50)
> at Python/pythonrun.c:1292
>
> #48 0x00007ff2e51b6af5 in run_file (p_cf=0x7fff3d5d3f50, filename=0xf0e7f0
> L"/x/eng/bbrtp/users/amresh/sshproxy_3896926_1608240818/
> test/nate/lib/NATE/Service/SSHProxy.py", fp=0xf77b60) at
> Modules/main.c:319
>
> #49 Py_Main (argc=argc at entry=6, argv=argv at entry=0xee6010) at
> Modules/main.c:751
>
> #50 0x0000000000400aa6 in main (argc=6, argv=<optimized out>) at
> ./Modules/python.c:69
>
> (gdb)
>
>
>
> Thanks and Regards,
>
> Amresh
>
>
>
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