any(A,2) on sparse A causes segfault

[David Bateman]

David Bateman wrote:
> Kim Hansen wrote:
>   
>> This code makes 2.9.19 crash:
>>   A = sprand(42,1856,0.56);
>>   a = any(A,2);
>>
>> The problem has been observed in the Debian package octave2.9 version
>> 1:2.9.19-1, and in cvs builds from December the 5th, 11th and 12th.
>> The Debian package version 1:2.9.18-1 does not have the problem.
>>
>> It looks like a problem where octave writes to some memory it
>> shouldn't touch, in some cases octave didn't crash on these two lines,
>> but crashed on the next line no matter what it was. I have tried to
>> debug it by running it through valgrind, but I had no luck. I will add
>> the valgrind log below.
>>
>> Regards,
>>   
>>     
>
> Kim,
>
> I can confirm that this bug exists. However, this is really hard to
> debug as the issue is in  the Sparse-op-defs.h (SPARSE_ANY_OP) macro,
> and so the debug won't give valid line number to identify where the bug
> is. Also changing Sparse-op-defs.h basically forces a complete rebuild
> of Octave. So in an attempt to debug this I created a separate oct-file
> with essentially the same code (attached), with the exception that the
> any function is a C++ function and no longer a method of the
> SparseMatrix class. However, this version of the code shows no bug even
> in valgrind..
>
> I'm a bit stumped at the moment and am still trying to figure this one out.
>
> D.
>   
Ok, I think I've found it, but have to do a recompile to check. In any
case the attached is a bug and should be patched.. I'll send a mail
confirming that this fixing the issue..

D.




-- 
David Bateman                                David.Bateman at motorola.com
Motorola Labs - Paris                        +33 1 69 35 48 04 (Ph) 
Parc Les Algorithmes, Commune de St Aubin    +33 6 72 01 06 33 (Mob) 
91193 Gif-Sur-Yvette FRANCE                  +33 1 69 35 77 01 (Fax) 

The information contained in this communication has been classified as: 

[x] General Business Information 
[ ] Motorola Internal Use Only 
[ ] Motorola Confidential Proprietary

-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: patch7
Url: https://www.cae.wisc.edu/pipermail/bug-octave/attachments/20071217/7f971b2f/attachment.ksh 
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: patch7.changelog
Url: https://www.cae.wisc.edu/pipermail/bug-octave/attachments/20071217/7f971b2f/attachment-0001.ksh