bugGNU Octave - Bugs: bug #41714, Imagesc causes bus error when...


bug #41714: Imagesc causes bus error when drawing large images

Submitted by:  Arun Giridhar <arungiridhar>
Submitted on:  Wed 26 Feb 2014 08:25:10 PM UTC  
Category:  Plotting with OpenGL Severity:  3 - Normal
Priority:  5 - Normal Item Group:  None
Status:  Duplicate Assigned to:  None
Originator Name:  Open/Closed:  Closed
Release:  dev Operating System:  GNU/Linux

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Thu 06 Mar 2014 05:36:14 PM UTC, comment #4: 

Sorry for the delay in responding. Work kept me away for a while.

There is no error with any graphics toolkit when I use "export QT_ACCESSIBILITY=0" before invoking Octave. Thanks for the workaround. This bug report can be merged with Bug #41552

Arun Giridhar <arungiridhar>
Sun 02 Mar 2014 06:15:43 PM UTC, comment #3: 

Arun, could you try the work-around that Felipe suggested and see if the Accessibility API is the source of the problem.

Rik <rik5>
Project Administrator
Thu 27 Feb 2014 02:06:23 AM UTC, comment #2: 

we've seen bus errors in bug #41552.

can you try this before starting Octave:


or else

sudo apt-get remove --purge qt-at-spi

just to isolate the problem.


Felipe G. Nievinski <fgnievinski>
Wed 26 Feb 2014 08:38:18 PM UTC, comment #1: 

Additional data: Bus error happens with FLTK as well.

Bus error DOES NOT happen with gnuplot.

Starting Octave in GUI mode versus with "--no-gui" makes no difference for FLTK and gnuplot (Qt is unavailable with --no-gui).

Arun Giridhar <arungiridhar>
Wed 26 Feb 2014 08:25:10 PM UTC, original submission:  

Octave exits with a bus error (signal 7) when one passes a large matrix to imagesc. This is using the Qt graphics toolkit on 64-bit Ubuntu 12.04. Using surf on the same large matrix works OK.

>> graphics_toolkit
ans = qt
>> n = 1000; imagesc(rand(n,n)); colorbar ## works
>> n = 4000; surf(rand(n,n)); colorbar ## works
>> n = 4000; imagesc(rand(n,n)); colorbar ## exits with bus error (signal 7)

Arun Giridhar <arungiridhar>


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    Follow 5 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2014-03-09 rik5 StatusNeed Info => Duplicate
        Open/ClosedOpen => Closed
    2014-03-02 rik5 CategoryPlotting => Plotting with OpenGL
        StatusNone => Need Info
    2014-02-27 rik5 Dependencies- => Depends on bugs #41552

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