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Re: Seg fault with test_sparse.m

From: Quentin Spencer
Subject: Re: Seg fault with test_sparse.m
Date: Thu, 03 Aug 2006 16:10:56 -0500
User-agent: Thunderbird (X11/20060614)

Joe Koski wrote:
Hi all,

After getting a successful build of octave-2.9.7 on my Mac G5 with OS X
10.4.7, Xcode tools 2.3 (gcc-4.0.1) and gfortran, I installed dejaGNU and
ran make check. I got one IO error, but things were going well until I hit
test_sparse. There I got a seg fault. I have attached the terminal output
and fntest.log output in case you want to see them.

I then moved to the test directory and ran octave. Here's what I got:

octave:1> test_sparse
writing test output to sptest.log
warning: Calculating Sparse Matrix Type
panic: Bus error -- stopping myself...
Bus error
Joe-Koskis-Computer:/Tools/octave-2.9.7/test jakoski$

I have also attached the sptest.log for your information.

To my untrained eye, the script seems to be running through quite a few
tests before the failure. Things are almost working.

Anyway, I'll be available to try things, but maybe it's time for someone
with sparse matrix knowledge (definitely not me) to try this on a Mac. I'll
be available to assist anyone who wants to try building octave-2.9.7 or
later on a Mac under OS X 10.4. I can cut many hours from the build process
with my experience from the last few days.

I just tried the sparse tests (Fedora 5 system) and I am seeing 3 failures out of 1176. I'm not getting segfaults, but I haven't looked any further to see what the errors are.

The other problem that I have is with the legend.m routine in octave-forge.
The problem is persistent with any script that uses legend. As I said, I can
file a bug report, if it is an unknown problem.

The last release of octave-forge does have a bug in legend. I've checked the fix into CVS, but I'm attaching the patch.


Index: main/plot/legend.m
RCS file: /cvsroot/octave/octave-forge/main/plot/legend.m,v
retrieving revision 1.16
diff -u -r1.16 legend.m
--- main/plot/legend.m  14 Apr 2006 12:51:14 -0000      1.16
+++ main/plot/legend.m  11 Jul 2006 16:09:07 -0000
@@ -195,7 +195,8 @@
   shell_cmd=["grep \"^", gnuplot_command_plot, " \" '", tmpfilename, "' | ", \
              "sed -e 's/,/ , /g' -e 's/\"/ \" /g'", " | ", \
              "awk '", awk_prog, "'"];
-  [status, plot_cmd] = split(system(shell_cmd),"\n");
+  [status, output] = system(shell_cmd);
+  plot_cmd = split(output,"\n");
   # Remove state file and sync file

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