[Octave-bug-tracker] [bug #53487] Segmentation fault when executing a script containing a figure

[Guillaume]

URL:
  <http://savannah.gnu.org/bugs/?53487>

                 Summary: Segmentation fault when executing a script
containing a figure
                 Project: GNU Octave
            Submitted by: gyom
            Submitted on: Tue 27 Mar 2018 04:43:05 PM UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Segfault, Bus Error, etc.
                  Status: None
             Assigned to: None
         Originator Name: Guillaume
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

I'm reporting a segfault in the same vein than bug #44875 so it might be hard
for others to reproduce.

If I run this executable:


#!/usr/bin/octave -fqH

F = figure ("Visible","off");
axes ("Parent",F);
uicontrol (F);

set (findobj (F,"FontUnits","points"),"FontUnits","normalized");
set (F,"Visible","on");


I get a segfault each time with 4.2.1:


> ./testfig
warning: base_graphics_object::get_properties: invalid graphics object
terminate called after throwing an instance of 'std::bad_cast'
  what():  std::bad_cast
panic: Aborted -- stopping myself...
attempting to save variables to 'octave-workspace'...
panic: attempted clean up failed -- aborting...
octave exited with signal 6


and a segfault about one in ten times with 4.5+:


> ./testfig
warning: base_graphics_object::get_properties: invalid graphics object
fatal: caught signal Segmentation fault -- stopping myself...
Segmentation fault (core dumped)


The script was initially much longer but I reached the point where it doesn't
crash any more if I remove a single line. Not sure each of them is necessary
as it might just be a race condition.

I couldn't initially reproduce it from the Octave command line but just
noticed I actually can if I paste all of the above followed by delete(F):


F = figure ("Visible","off");
axes ("Parent",F);
uicontrol (F);

set (findobj (F,"FontUnits","points"),"FontUnits","normalized");
set (F,"Visible","on");
delete (F);






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