Debian Bug report logs - #567975
FP error when filtering an empty vector

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Bas Zoetekouw <bas@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: FP error when filtering an empty vector

Date: Mon, 01 Feb 2010 16:37:18 +0100

Package: octave3.2
Version: 3.2.4-1
Severity: important

Octave crashes when trying to filter() an empty vector:

| octave:1> a=1; b=ones(10,1)/10; foo=filter(b,a,[]);
| panic: Floating point exception -- stopping myself...
| attempting to save variables to `octave-core'...
| save to `octave-core' complete
| zsh: floating point exception  octave

and I'm dropped back into the shell...

Of course, filtering an empty vector doesnt make much sense, but it certainly
shouldn't cause a crash.
FWIT, Matlab simple returns an empty vector.

-- System Information:
Debian Release: 5.0.4
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.26-2-amd64 (SMP w/1 CPU core)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Message #10 received at 567975@bugs.debian.org (full text, mbox, reply):

From: "John W. Eaton" <jwe@octave.org>

To: Bas Zoetekouw <bas@debian.org>, 567975@bugs.debian.org

Cc: Debian Bug Tracking System <submit@bugs.debian.org>, octave maintainers mailing list <maintainers@octave.org>

Subject: [Pkg-octave-devel] Bug#567975: FP error when filtering an empty vector

Date: Tue, 2 Feb 2010 01:26:41 -0500

On  1-Feb-2010, Bas Zoetekouw wrote:

| Octave crashes when trying to filter() an empty vector:
| 
| | octave:1> a=1; b=ones(10,1)/10; foo=filter(b,a,[]);
| | panic: Floating point exception -- stopping myself...
| | attempting to save variables to `octave-core'...
| | save to `octave-core' complete
| | zsh: floating point exception  octave
| 
| and I'm dropped back into the shell...
| 
| Of course, filtering an empty vector doesnt make much sense, but it certainly
| shouldn't cause a crash.
| FWIT, Matlab simple returns an empty vector.
| 
| -- System Information:
| Debian Release: 5.0.4
|   APT prefers stable
|   APT policy: (500, 'stable')
| Architecture: amd64 (x86_64)
| 
| Kernel: Linux 2.6.26-2-amd64 (SMP w/1 CPU core)
| Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
| Shell: /bin/sh linked to /bin/bash

I checked in the following change:

  http://hg.savannah.gnu.org/hgweb/octave/rev/a277ba5da4dc

I'm not sure this fix places the return in exactly the right
location.  Should it be later in the function, after other dimension
checks?  It would be nice if someone who is more familiar with how
filter is expected to work would comment.

Also, in the future, please report bugs in Octave itself directly to
the bug@octave.org mailing list and use the Debian bug reporting
system for problems specific to the Debian package.

Thanks,

jwe

Message #15 received at 567975@bugs.debian.org (full text, mbox, reply):

From: Thomas Weber <thomas.weber.mail@gmail.com>

To: "John W. Eaton" <jwe@octave.org>

Cc: Bas Zoetekouw <bas@debian.org>, 567975@bugs.debian.org, octave maintainers mailing list <maintainers@octave.org>

Subject: Re: [Pkg-octave-devel] Bug#567975: FP error when filtering an empty vector

Date: Tue, 2 Feb 2010 10:09:06 +0100

[Message part 1 (text/plain, inline)]

On Tue, Feb 02, 2010 at 01:26:41AM -0500, John W. Eaton wrote:
> On  1-Feb-2010, Bas Zoetekouw wrote:
> 
> | Octave crashes when trying to filter() an empty vector:
> | 
> | | octave:1> a=1; b=ones(10,1)/10; foo=filter(b,a,[]);
> | | panic: Floating point exception -- stopping myself...
> | | attempting to save variables to `octave-core'...
> | | save to `octave-core' complete
> | | zsh: floating point exception  octave
> | 
> | and I'm dropped back into the shell...
> | 
> | Of course, filtering an empty vector doesnt make much sense, but it certainly
> | shouldn't cause a crash.
> | FWIT, Matlab simple returns an empty vector.
> | 
> | -- System Information:
> | Debian Release: 5.0.4
> |   APT prefers stable
> |   APT policy: (500, 'stable')
> | Architecture: amd64 (x86_64)
> | 
> | Kernel: Linux 2.6.26-2-amd64 (SMP w/1 CPU core)
> | Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
> | Shell: /bin/sh linked to /bin/bash
> 
> I checked in the following change:
> 
>   http://hg.savannah.gnu.org/hgweb/octave/rev/a277ba5da4dc
> 
> I'm not sure this fix places the return in exactly the right
> location.  Should it be later in the function, after other dimension
> checks?  It would be nice if someone who is more familiar with how
> filter is expected to work would comment.
> 
> Also, in the future, please report bugs in Octave itself directly to
> the bug@octave.org mailing list and use the Debian bug reporting
> system for problems specific to the Debian package.

Attached is a test case for this. No changelog entry, I don't think this
warrants one.

	Thomas

[filtertest.hg (text/plain, attachment)]

Message #20 received at 567975@bugs.debian.org (full text, mbox, reply):

From: "John W. Eaton" <jwe@octave.org>

To: Thomas Weber <thomas.weber.mail@gmail.com>, 567975@bugs.debian.org

Cc: Bas Zoetekouw <bas@debian.org>, octave maintainers mailing list <maintainers@octave.org>

Subject: [Pkg-octave-devel] Bug#567975: Bug#567975: FP error when filtering an empty vector

Date: Tue, 2 Feb 2010 04:43:32 -0500

On  2-Feb-2010, Thomas Weber wrote:

| Attached is a test case for this. No changelog entry, I don't think this
| warrants one.

I added one anyway.

I also added a second test with the empty matrix being 1x0x2.

Thanks,

jwe

Message #25 received at 567975-close@bugs.debian.org (full text, mbox, reply):

From: Thomas Weber <thomas.weber.mail@gmail.com>

To: 567975-close@bugs.debian.org

Subject: Bug#567975: fixed in octave3.2 3.2.4-2

Date: Wed, 17 Feb 2010 22:02:07 +0000

Source: octave3.2
Source-Version: 3.2.4-2

We believe that the bug you reported is fixed in the latest version of
octave3.2, which is due to be installed in the Debian FTP archive:

octave3.2-common_3.2.4-2_all.deb
  to main/o/octave3.2/octave3.2-common_3.2.4-2_all.deb
octave3.2-dbg_3.2.4-2_amd64.deb
  to main/o/octave3.2/octave3.2-dbg_3.2.4-2_amd64.deb
octave3.2-doc_3.2.4-2_all.deb
  to main/o/octave3.2/octave3.2-doc_3.2.4-2_all.deb
octave3.2-emacsen_3.2.4-2_all.deb
  to main/o/octave3.2/octave3.2-emacsen_3.2.4-2_all.deb
octave3.2-headers_3.2.4-2_amd64.deb
  to main/o/octave3.2/octave3.2-headers_3.2.4-2_amd64.deb
octave3.2-htmldoc_3.2.4-2_all.deb
  to main/o/octave3.2/octave3.2-htmldoc_3.2.4-2_all.deb
octave3.2-info_3.2.4-2_all.deb
  to main/o/octave3.2/octave3.2-info_3.2.4-2_all.deb
octave3.2_3.2.4-2.diff.gz
  to main/o/octave3.2/octave3.2_3.2.4-2.diff.gz
octave3.2_3.2.4-2.dsc
  to main/o/octave3.2/octave3.2_3.2.4-2.dsc
octave3.2_3.2.4-2_amd64.deb
  to main/o/octave3.2/octave3.2_3.2.4-2_amd64.deb



A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 567975@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Thomas Weber <thomas.weber.mail@gmail.com> (supplier of updated octave3.2 package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@debian.org)


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Hash: SHA1

Format: 1.8
Date: Wed, 17 Feb 2010 20:58:54 +0100
Source: octave3.2
Binary: octave3.2 octave3.2-doc octave3.2-htmldoc octave3.2-headers octave3.2-emacsen octave3.2-info octave3.2-dbg octave3.2-common
Architecture: source amd64 all
Version: 3.2.4-2
Distribution: unstable
Urgency: low
Maintainer: Debian Octave Group <pkg-octave-devel@lists.alioth.debian.org>
Changed-By: Thomas Weber <thomas.weber.mail@gmail.com>
Description: 
 octave3.2  - GNU Octave language for numerical computations (3.2 branch)
 octave3.2-common - architecture-independent files for octave3.2
 octave3.2-dbg - Debug symbols for octave3.2
 octave3.2-doc - PDF documentation on the GNU Octave language (3.2 branch)
 octave3.2-emacsen - Emacs support for the GNU Octave language (3.2 branch)
 octave3.2-headers - header files for the GNU Octave language (3.2 branch)
 octave3.2-htmldoc - HTML documentation on the GNU Octave language (3.2 branch)
 octave3.2-info - GNU Info documentation on the GNU Octave language (3.2 branch)
Closes: 567975
Changes: 
 octave3.2 (3.2.4-2) unstable; urgency=low
 .
   * New patch: filter_empty_vector; let filter() handle empty vectors (closes:
     #567975). Thanks to John Eaton for the patch
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