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[Octave-bug-tracker] [bug #44292] Frequent crashes when printing to eps

From: Dan Sebald
Subject: [Octave-bug-tracker] [bug #44292] Frequent crashes when printing to eps on Windows platform
Date: Sat, 28 Feb 2015 09:49:13 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:18.0) Gecko/20100101 Firefox/18.0 SeaMonkey/2.15

Follow-up Comment #16, bug #44292 (project octave):

The changes with the new code

                  if (! file.empty () && file[0] == '|')
                    file = file.substr (1);  // Strip leading pipe character

are more robust than previous.  However, I can still get the following

octave:1> surf (peaks)
octave:2> print -depsc tst.eps
pipeline = 
  [1,1] = /dev/null
error: drawnow: nonexistent directory ' | /dev/'
error: called from
    __opengl_print__ at line 172 column 7
    print at line 431 column 14


octave:1> surf (peaks)
octave:2> print -depsc tst.eps
sh: -c: line 0: syntax error near unexpected token `|'
sh: -c: line 0: ` |'
warning: broken pipe
pipeline = 
  [1,1] = 

by massaging the pipeline whitespace.  I know it is a contrived situation, but
still drawnow() is a user-callable function.

Also, I suspect that the current, recently added changes to
__osmesa_print__.cc could result in a segmentation fault if the string is
tweaked in the wrong way.  However, I'm having problems with seg faults
elsewhere after building with the new OSMesa code--related to the osmesa
library being out of date probably (v. 7.9, but I can't compile the latest
10.2 OSMesa because it wants recent GLProto, which is getting into x11 files,
something I don't want to deal with now) and rend.draw() which is also
crashing, but I'm not sure why.

I've attached a patch that I think handles all situations of white space and
bogus file names in an organized way.  Please try it and let me know how
OSMesa print is working for you.  E.g.,

octave:1> surf (peaks)
octave:2> set (1, 'visible', 'off');
octave:3> print -depsc tst.eps
panic: Segmentation fault -- stopping myself...
attempting to save variables to 'octave-workspace'...
save to 'octave-workspace' complete
Segmentation fault (core dumped)

That seg fault is occurring before even reaching the changeset hunk.

(file #33209)

Additional Item Attachment:

File name: octave-pipeline_decode-djs2015feb28.patch Size:3 KB


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