[Python-modules-team] Bug#448530: bug reproduced

[Jan Medlock]

On Thu, Dec 20, 2007 at 08:01:01PM +0100, Ondrej Certik wrote:
> Paul Metcalfe has sent me this explanation:
> 
> I think it's a packaging problem with linear algebra.
> 
> ...

Hi Ondrej,
I'm still here.  I saw the bug in the NumPy bug tracker that
suggests the problem is specific to Debian & Ubuntu and Paul
Metcalfe's details about linking.

Linking against ATLAS instead of BLAS & LAPACK may indeed ultimately
be the problem and I'm afraid I don't understand the details.  That
said, I believe the problem is SSE2 specific.  The machine that I'm
having the problem with is an Intel Pentium4 with SSE2, but I also
have an AMD K7 machine that has 3DNow but not SSE2.  The AMD machine
does not exhibit the bug with the 3DNow version of ATLAS.  (Of course
neither do with the SSE or base versions of ATLAS.)

I haven't participated in the thread on the NumPy mailing list because
I don't see a way to reply to the thread since I wasn't subscribed at
the time...

Attached is a gdb backtrace.  Please let me know how I can make it
more informative, if necessary.

Thanks again for tracking down this bug,
Jan
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Using host libthread_db library "/lib/i686/cmov/libthread_db.so.1".
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[Thread debugging using libthread_db enabled]
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[New Thread 0xb7db18c0 (LWP 23839)]
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Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb7db18c0 (LWP 23839)]
0xb760afb1 in ATL_dgemvT_a1_x1_b0_y1 () from /usr/lib/sse2/libf77blas.so.3
#0  0xb760afb1 in ATL_dgemvT_a1_x1_b0_y1 () from /usr/lib/sse2/libf77blas.so.3
#1  0xb760363e in ATL_dgemv () from /usr/lib/sse2/libf77blas.so.3
#2  0x00000121 in ?? ()
#3  0x00000011 in ?? ()
#4  0x00000000 in ?? ()