Red Hat Bugzilla – Bug 236083
illegal instruction exception on 64 bit machine
Last modified: 2008-05-06 15:30:23 EDT
Description of problem:
cblas_dgemm generates illegal instruction error for large arrays.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
int main(int argc, char **argv)
static double a[1000*1000];
static double b[1000*1000];
static double c[1000*1000];
double alpha=1, beta=0;
cblas_dgemm(CblasRowMajor, CblasNoTrans, CblasNoTrans, 1000, 1000, 1000,
alpha, a, 1000, b, 1000, beta, c, 1000);
gcc -L/usr/lib64/atlas -lcblas blas_error.c -o blas_error
This is a 64 bit problem with large arrays, it doesn't occur on 32 bit machines
or with smaller arrays. My machine is
vendor_id : GenuineIntel
cpu family : 15
model : 4
model name : Intel(R) Xeon(TM) CPU 3.40GHz
The bug also appears with Ubuntu Dapper and there is a similar report in the
octave mailing list.
Atlas-2.7.30 compiled on my machine works fine for the test program.
Fedora apologizes that these issues have not been resolved yet. We're
sorry it's taken so long for your bug to be properly triaged and acted
on. We appreciate the time you took to report this issue and want to
make sure no important bugs slip through the cracks.
If you're currently running a version of Fedora Core between 1 and 6,
please note that Fedora no longer maintains these releases. We strongly
encourage you to upgrade to a current Fedora release. In order to
refocus our efforts as a project we are flagging all of the open bugs
for releases which are no longer maintained and closing them.
If this bug is still open against Fedora Core 1 through 6, thirty days
from now, it will be closed 'WONTFIX'. If you can reporduce this bug in
the latest Fedora version, please change to the respective version. If
you are unable to do this, please add a comment to this bug requesting
Thanks for your help, and we apologize again that we haven't handled
these issues to this point.
The process we are following is outlined here:
We will be following the process here:
http://fedoraproject.org/wiki/BugZappers/HouseKeeping to ensure this
doesn't happen again.
And if you'd like to join the bug triage team to help make things
better, check out http://fedoraproject.org/wiki/BugZappers
This bug is open for a Fedora version that is no longer maintained and
will not be fixed by Fedora. Therefore we are closing this bug.
If you can reproduce this bug against a currently maintained version of
Fedora please feel free to reopen thus bug against that version.
Thank you for reporting this bug and we are sorry it could not be fixed.