Public bug reported:
With stock ATLAS, Python, numpy from natty on x86-32, I get the
following behavior when trying to solve this least-squares problem:
http://math.nist.gov/MatrixMarket/data/Harwell-Boeing/lsq/well1850.html
$ python -c 'import cPickle; import gzip; import numpy as np; x, y =
cPickle.load(gzip.open("well1850.pickle.gz")); np.linalg.lstsq(x, y)'
Illegal instruction
(Note that while this matrix is sparse, I have it stored in a dense
numpy array. The file 'well1850.pickle.gz' is attached to make it easier
to reproduce.)
Expected behavior: I wouldn't think you should ever get a SIGILL from
BLAS, no matter what you do.
I can't seem to find any dbgsym packages for ATLAS, but gdb says:
(gdb) r
Starting program: /usr/bin/python -c import\ cPickle\;\ import\ gzip\;\ import\
numpy\ as\ np\;\ x,\ y\ =\
cPickle.load\(gzip.open\(\"well1850.pickle.gz\"\)\)\;\ np.linalg.lstsq\(x,\ y\)
[Thread debugging using libthread_db enabled]
Program received signal SIGILL, Illegal instruction.
0x00704e89 in ATL_dupMBmm0_4_0_b0 () from /usr/lib/libblas.so.3gf
(gdb) bt
#0 0x00704e89 in ATL_dupMBmm0_4_0_b0 () from /usr/lib/libblas.so.3gf
#1 0x000002c8 in ?? ()
#2 0x0087b4f8 in ?? () from /usr/lib/libblas.so.3gf
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(gdb)
ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: libatlas3gf-base 3.8.3-29
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
Architecture: i386
Date: Thu May 5 17:05:48 2011
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
ProcEnviron:
LANGUAGE=en_US:en
PATH=(custom, user)
LANG=en_US.UTF-8
SHELL=/usr/bin/zsh
SourcePackage: atlas
UpgradeStatus: Upgraded to natty on 2011-05-05 (0 days ago)
** Affects: atlas (Ubuntu)
Importance: Undecided
Status: New
** Affects: python-numpy (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386 natty
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https://bugs.launchpad.net/bugs/778217
Title:
"illegal instruction" crash when solving least-squares problem
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