[Octave-bug-tracker] [bug #58814] Abort, core dump on exiting from graphics code

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?58814>

                 Summary: Abort, core dump on exiting from graphics code
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Thu 23 Jul 2020 10:23:14 PM UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Segfault, Bus Error, etc.
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: dev
         Discussion Lock: Any
        Operating System: GNU/Linux

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Details:

GNU Octave Version: 7.0.0 (hg id: 5b1143d1d74b)

This bug report is to report a repeatable segfault in certain conditions. This
is specific to invoking the file as "octave foo.m" from the bash prompt (or
from a shell script) and does not happen when invoking foo.m from within the
Octave command prompt. It looks like Octave exits before the graphics objects
are cleaned up.

Code:

% mytest.m
n = 6;
A = (rand(n,n,n) > 0.5);

# the following function can be in a standalone file too. the bug still
happens.
function voxel2 (pos, sz = [1 1 1], color = [0.8 0.8 0.8], alpha = 0.2)
  verts = (dec2bin(0:7)=='1') .* sz + pos;
  faces = [1 2 4 3; 5 6 8 7; 1 3 7 5; 2 4 8 6; 1 2 7 5; 3 4 8 7]; # the 6
faces of the cube in cyclic order
  patch ("Faces",faces, "Vertices",verts, "facecolor",color,
"facealpha",alpha);
endfunction

for i = 1:10
  # the bug does not happen if this loop executes 7 times or fewer. 8 times or
more it is repeatable.
  # in production code, matrix A changes for each iteration but for showing
this bug it's been frozen
  figure(i); hold on; axis equal; axis off; view(135,
atan(1/sqrt(2))*180/pi);
  for p = 1:n
    for q = 1:n
      for r = 1:n
        if (A(p,q,r))
          voxel2 ([p q r]);
        endif
      endfor
    endfor
  endfor
  # saveas (gcf, sprintf ("test%02d.png", i)); # this has been commented out
for speeding up bug test execution
endfor

# if calling this script as "octave mytest.m" then segfault / abort occurs
here during cleaning up and exiting


Observed output from the bash prompt, after drawing the figure windows:

$ octave mytest.m 
warning: base_graphics_object::get_properties: invalid graphics object
terminate called after throwing an instance of 'std::bad_cast'
  what():  std::bad_cast
fatal: caught signal Aborted -- stopping myself...
Aborted (core dumped)






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