[Deb-scipy-devel] Bug#448530: python-numpy: numpy/atlas3-sse2 segfault

[Jan Medlock]

Package: python-numpy
Version: 1:1.0.3-1
Severity: normal


Hi there,
I get strange segfaults with numpy/atlas3-sse2 under python 2.4.

The attached script and pickled matrix illustrate the segfault.  The
pickled matrix ('phi.p') was generated by scipy.dump and seems to be
not broken itself.  The script loads this matrix and tries to perform
a matrix-vector multiplication, leading to the segfault when using
atlas3-sse2.

Using strace led me to investigate atlas3 (trace attached).  The
script does not segfault when using atlas3-sse, atlas3-base, or
atlas3-3dnow (the latter on a different machine).

$ LD_LIBRARY_PATH=/usr/lib/atlas/sse2 python test.py
About to mulitply
Segmentation fault

$ LD_LIBRARY_PATH=/usr/lib/atlas/sse python test.py
About to mulitply
Multiplied


I'm happy to give any help I can in tracking down this issue.


-- System Information:
Debian Release: lenny/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing')
Architecture: i386 (i686)

Kernel: Linux 2.6.22-2-686 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages python-numpy depends on:
ii  atlas3-base [liblapack.so.3]  3.6.0-20.6 Automatically Tuned Linear Algebra
ii  atlas3-sse [liblapack.so.3]   3.6.0-20.6 Automatically Tuned Linear Algebra
ii  atlas3-sse2 [liblapack.so.3]  3.6.0-20.6 Automatically Tuned Linear Algebra
ii  libc6                         2.6.1-6    GNU C Library: Shared libraries
ii  libg2c0                       1:3.4.6-6  Runtime library for GNU Fortran 77
ii  libgcc1                       1:4.2.2-3  GCC support library
ii  python                        2.4.4-6    An interactive high-level object-o
ii  python-central                0.5.15     register and build utility for Pyt
ii  python-numpy-dev              1:1.0.3-1  Numerical Python adds a fast array
ii  refblas3 [libblas.so.3]       1.2-8      Basic Linear Algebra Subroutines 3

python-numpy recommends no packages.

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