Re: GUI crash exit 11 again

[Daniel J Sebald]

On 07/04/2014 08:02 PM, Jordi Gutiérrez Hermoso wrote:
> On Fri, 2014-07-04 at 14:26 -0700, martine1212 wrote:
> > I am not really a programmer.... but I will do my best to find what is
> > causing it.
>
> The only thing that can help obtain a diagnosis is a stack trace in
> gdb. Everything else is guesswork and voodoo.
>
> - Jordi G. H.

Come on Jordi, give us more credit than just mystical guesswork.

This one may not be Octave's bug, but we should double check this to 
verify the GNU library is being used correctly.

I looked at libinterp/octave.cc for the use of "force-gui".  The 
variable force_gui_option is used in such a straightforward way and is 
isolated to the file octave.cc that I can't imagine the bug resides 
after the point of checking if the GUI needs to be launched.

So I'm guessing the problem is somewhere prior and that some memory in 
program space is being corrupted due to use of a bad pointer.  I'm 
thinking it could be this line:

      int optc = getopt_long (argc, argv, short_opts, long_opts, 
&long_idx);

in libinterp/octave.cc.  getopt_long looks to be something from the GNU 
library.  See file libgnu/getopt.h for the complex set of definitions 
concerning getopt_long.

There are several things that could be happening.

1) Octave is using getopt_long from a library which is bad on 
martine1212's system.  [Would be my guess seeing as though others with 
similar setups aren't seeing this bug.]

2) Octave is not using getopt_long() function properly in terms of input 
arguments.  [But I've checked the code and to me it looks like Octave is 
using the function in a valid way.]

3) Somehow the definitions in getopt.h are pre-processing out the 
declaration for getopt_long() and the compiler is build a bad function 
interface.

martine1212, could you please "touch libinterp/octave.cc" from the root 
source directory and then make octave?  Look for any warnings that might 
appear for "getopt_long" during the build process.

> I have two the same machine at work..running Suse 12.3.... one does not
> crash the other one crashes.

Is there some way that you can check the version of GNU library on both 
of these systems?  I'm not seeing anything in config.h about the GNULIB 
version, just stuff like:

#define GNULIB_TEST_GETOPT_GNU 1

If you are adventurous, change the line of code

      int optc = getopt_long (argc, argv, short_opts, long_opts, 
&long_idx);

so that it looks like the following three lines:

//      int optc = getopt_long (argc, argv, short_opts, long_opts, 
&long_idx);
force_gui_option = true;
optc = -1;

(All that does is bypass the getopt_long() call and configure things as 
though "--force-gui" was the only option.)  Recompile and run "octave 
--force-gui" once again to see if the program crashes or not.

Dan