Several crash cases for build with recent sources

[John W. Eaton]

On 11-May-2009, Alexander Mamonov wrote:

| Here are several crashing instances on my build of Octave from recent
| sources on Windows with MinGW:
| 
| octave:1> backend('fltk');
| octave:2> clear all;
| octave:3> panic: Segmentation violation -- stopping myself...
| attempting to save variables to `octave-core'...
| save to `octave-core' complete
| warning: figs is no longer a built-in variable; please read the NEWS
| file or type `news' for details

I checked in the following changes for this problem:

  http://hg.savannah.gnu.org/hgweb/octave/rev/1500d0197484
  http://hg.savannah.gnu.org/hgweb/octave/rev/9d4b84b14bf0

| octave:1> eigs(1)
| error: eigs: Too many eigenvalues to extract (k >= n).
|       Use 'eig(full(A))' instead
| terminate called after throwing an instance of 'octave_execution_exception'
| 
| This application has requested the Runtime to terminate it in an unusual way.
| Please contact the application's support team for more information.
| panic: Aborted -- stopping myself...
| attempting to save variables to `octave-core'...
| save to `octave-core' complete
| 
| octave:1> svds(1)
| error: eigs: error -3 in dsaupd
| terminate called after throwing an instance of 'octave_execution_exception'
| 
| This application has requested the Runtime to terminate it in an unusual way.
| Please contact the application's support team for more information.
| panic: Aborted -- stopping myself...
| attempting to save variables to `octave-core'...
| save to `octave-core' complete
| error: stdin is not a tty!

I can't reproduce either of these problems.

| Cases 2 and 3 might be platform-dependent issues.

If you want to debug these problems, then I recommend running Octave
under gdb and finding precisely where it is crashing.  Also, what
version of arpack do you have?

| Case 1 looks very
| much like Octave 3.0.x clear all
| crash that happens for certain octave-forge packages.

It was a similar problem, but not exactly the same.

jwe