Debugging segmentation faults

SPE - Stani's Python Editor spe.stani.be at gmail.com
Wed Mar 7 21:55:44 CET 2007


If the error is reproducable and you can run wxPython, you could use
the excellent WinPdb debugger, which ships with SPE (python editor):
http://www.digitalpeers.com/pythondebugger/

... but if you can only run your script on a remote server this won't
help you.

Stani

--
SPE - http://pythonide.stani.be

On 7 Mrz., 20:15, "George Sakkis" <george.sak... at gmail.com> wrote:
> I have a pure python program (no C extensions) that occasionally core
> dumps in a non-reproducible way. The program is started by a (non-
> python) cgi script when a form is submitted. It involves running a
> bunch of other programs through subprocess in multiple threads and
> writing its output in several files. So the only suspicious parts I
> can think of is subprocess and/or multithreading. For the
> multithreading part I'm using a modified version of threadpool.py
> (http://www.chrisarndt.de/en/software/python/threadpool/), which is
> built on top of the threading and Queue stdlib modules. Whatever bugs
> may linger there, I'd hope that they would show up as normal Python
> exceptions instead of segfaults.
>
> All I have now is a few not particularly insightful core files (actual
> path names and args changed for privacy):
>
> /home/gsakkis/foo>gdb --core core.20140
> GNU gdb Red Hat Linux (5.2-2)
> Copyright 2002 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and
> you are
> welcome to change it and/or distribute copies of it under certain
> conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for
> details.
> This GDB was configured as "i386-redhat-linux".
> Core was generated by `python2.5 /home/gsakkis/foo/foo.py --XXX --
> max=30 --bar=/tmp/83840`
> Program terminated with signal 11, Segmentation fault.
> #0  0x080b222d in ?? ()
> (gdb) backtrace
> #0  0x080b222d in ?? ()
> #1  0x080b28d1 in ?? ()
> #2  0x080fa8ab in ?? ()
> #3  0x0805c918 in ?? ()
> (...)
> #28 0x080b310f in ?? ()
> #29 0x080dbfdd in ?? ()
> #30 0x40021fef in ?? ()
>
> Any hints ?





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