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Bug 590504 - Octave crashes after operating on matrix created w/ eye
Summary: Octave crashes after operating on matrix created w/ eye
Alias: None
Product: Fedora
Classification: Fedora
Component: octave
Version: 14
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Rakesh Pandit
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2010-05-09 23:50 UTC by JR
Modified: 2011-07-30 14:37 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2011-07-30 14:37:53 UTC

Attachments (Terms of Use)

Description JR 2010-05-09 23:50:48 UTC
Description of problem:
Creating a matrix with eye(n) and then doing an rref() on that matrix causes octave to crash complaining about a corrupted doubly-linked list.  Sometimes it backs out nicely.  Other times, a kill -9 is in order on the PID.

Version-Release number of selected component (if applicable):
$ rpm -qa | grep octave
$ rpm -qa | grep glibc

How reproducible:
Always, but error messages change for no apparent reason.  A crash always ensues.  

Steps to Reproduce:
1. Load octave command line prompt.
2. Execute the following:
A=eye(6) [enter]
A  [enter]
rref(A) [enter]
exit [enter]
(Crashes here)
Actual results:
octave crashes

Expected results:
Return the identity matrix as it is already in simplest terms.

Additional info:
$ octave
GNU Octave, version 3.2.4
Copyright (C) 2009 John W. Eaton and others.
This is free software; see the source code for copying conditions.
FITNESS FOR A PARTICULAR PURPOSE.  For details, type `warranty'.

Octave was configured for "x86_64-redhat-linux-gnu".

Additional information about Octave is available at

Please contribute if you find this software useful.
For more information, visit

Report bugs to <> (but first, please read to learn how to write a helpful report).

For information about changes from previous versions, type `news'.

octave:1> A=eye(6)
A =

Diagonal Matrix

   1   0   0   0   0   0
   0   1   0   0   0   0
   0   0   1   0   0   0
   0   0   0   1   0   0
   0   0   0   0   1   0
   0   0   0   0   0   1

octave:2> rref(A)
ans =

   1   0   0   0   0   0
   0   1   0   0   0   0
   0   0   1   0   0   0
   0   0   0   1   0   0
   0   0   0   0   1   0
   0   0   0   0   0   1

octave:3> quit
*** glibc detected *** octave: corrupted double-linked list: <<hash value removed>> ***

**NOTE:  This also occurs on the latest available octave for Fedora 12 as well.  The error messages change as well.

Comment 1 JR 2010-05-27 22:25:57 UTC
It appears this has been fixed in the upstream project.  Please view  

Unfortunately I don't see an obvious change in the source tree that references that bug report.

Comment 2 JR 2010-06-20 20:34:39 UTC
Note:  This still occurs in the package provided by Fedora.  (Fedora 13 i686)  


Comment 3 Alex Lancaster 2010-07-17 19:44:51 UTC
We should look into maybe backporting this fix to Octave 3.2.4 if it fixes this bug.  Rakesh?

Comment 4 JR 2011-02-23 01:07:24 UTC
Still impacts Fedora 14 as well.  I see that Version 3.4.0 was released at the beginning of February.  Is there a build of that I can try for F14 to see if this issue is finally resolved?

Comment 5 JR 2011-07-30 14:37:53 UTC
In F15 the bug is fixed with the release of octave-3.4.0-6.fc15.i686.  Closing the bug I reported.

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