[Python-Dev] How to debug pyexpat SIGSEGV with GDB?

[Jeremy Hylton]

On Mon, 2004-03-01 at 10:09, Skip Montanaro wrote:
>     >> So, how can I figure out where in the Python source the function call
>     >> is coming from using gdb? I'm sure it involves "print" and some
>     >> casts.. I couldn't find a howto on python.org
> 
>     Jeremy> First, make sure that the code from Misc/gdbinit is in your
>     Jeremy> .gdbinit file.  Get the stack trace in gdb and move up/down
>     Jeremy> until you get to an eval_frame() frame.  Then call the function
>     Jeremy> pyframe.  It will print the filename, function name, and line
>     Jeremy> number of the current frame.  The lineno usually points to the
>     Jeremy> first line of the function.
> 
> I have this in my .gdbinit file:
> 
>     define ppystack
>         while $pc < Py_Main || $pc > Py_GetArgcArgv
>             if $pc > eval_frame && $pc < PyEval_EvalCodeEx
>                 set $__fn = PyString_AsString(co->co_filename)
>                 set $__n = PyString_AsString(co->co_name)
>                 printf "%s (%d): %s\n",  $__fn, f->f_lineno, $__n
>             end
>             up-silently 1
>         end
>         select-frame 0
>     end

That's nice!  I never learned how to write real programs in gdb.
You should add a copy to gdbinit.

Jeremy