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

Fri Sep 2 14:48:01 EDT 2016

Yes

Thanks and Regards,
Amresh

From: Burkhard Meier <burkhardameier at gmail.com>
Date: Saturday, September 3, 2016 at 12:12 AM
To: Amresh Sajjanshetty <Amresh.Sajjanshetty at netapp.com>
Cc: "python-dev at python.org" <python-dev at python.org>
Subject: Re: [Python-Dev] Need help in debugging the python core

You are using bash?
On Sep 2, 2016 8:56 AM, "Sajjanshetty, Amresh" <Amresh.Sajjanshetty at netapp.com<mailto: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<tel:2147483647>,
    __pyx_v_max_bin_len=__pyx_v_max_bin_len at entry=2147483647<tel:2147483647>, __pyx_v_max_array_len=2147483647<tel:2147483647>, __pyx_v_max_map_len=2147483647<tel:2147483647>, __pyx_v_max_ext_len=__pyx_v_max_ext_len at entry=2147483647<tel: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

_______________________________________________
Python-Dev mailing list
Python-Dev at python.org<mailto:Python-Dev at python.org>
https://mail.python.org/mailman/listinfo/python-dev
Unsubscribe: https://mail.python.org/mailman/options/python-dev/burkhardameier%40gmail.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-dev/attachments/20160902/fcfb2f16/attachment-0001.html>