From bug-request at octave dot org Thu Dec  8 11:58:49 2005
Subject: Octave segfaults on a valid command line
From: "Michael Smolsky" <sitrash at email dot com>
To: bug-octave at bevo dot che dot wisc dot edu
Date: Thu, 8 Dec 2005 11:46:19 -0600

Hi,

Thanks for maintaining a great product.

Octave crashes on the following command line:

clear,u=[1,2,3];v=find(u>100);for i=u(v).',i,end

As you see, the loop here is over an empty vector of a certain kind. I have a similar line in my script (that's how I ran into the bug), so I don't think it matters whether the line is invoked from the interpretter command line or from an m-function.

Please, find system and octave version information, as well as a log of a crashed session below.

Thanks again,

Michael.

The OS I'm running is:

langley:~/Timing/matlab>cat /etc/redhat-release
Red Hat Enterprise Linux WS release 4 (Nahant Update 2)
langley:~/Timing/matlab>uname -a
Linux langley.somedomain.com 2.6.9-22.0.1.ELsmp #1 SMP Tue Oct 18 18:39:27 EDT 2005 i686 i686 i386 GNU/Linux

(NOTE: domain name changed, my employer is paranoid about privacy issues)

We have a pretty standard linux installation on a multi-cpu XEON server.

Octaverc file:

langley:~/Timing/matlab>cat ~/.octaverc
page_screen_output = 0;
langley:~/Timing/matlab>

Octave session that demostrates the crash:

langley:~/Timing/matlab>octave
GNU Octave, version 2.1.57 (i686-pc-linux-gnu).
Copyright (C) 2004 John W. Eaton.
This is free software; see the source code for copying conditions.
There is ABSOLUTELY NO WARRANTY; not even for MERCHANTIBILITY or
FITNESS FOR A PARTICULAR PURPOSE.  For details, type `warranty'.

Additional information about Octave is available at http://www.octave.org.

Please contribute if you find this software useful.
For more information, visit http://www.octave.org/help-wanted.html

Report bugs to <bug-octave at bevo dot che dot wisc dot edu> (but first, please read
http://www.octave.org/bugs.html to learn how to write a helpful report).

octave:1> clear,u=[1,2,3];v=find(u>100);for i=u(v).',i,end
panic: Segmentation fault -- stopping myself...
attempting to save variables to `octave-core'...
save to `octave-core' complete
Segmentation fault
langley:~/Timing/matlab>


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