Note: This is a beta release of Red Hat Bugzilla 5.0. The data contained within is a snapshot of the live data so any changes you make will not be reflected in the production Bugzilla. Also email is disabled so feel free to test any aspect of the site that you want. File any problems you find or give feedback here.
Bug 236083 - illegal instruction exception on 64 bit machine
Summary: illegal instruction exception on 64 bit machine
Alias: None
Product: Fedora
Classification: Fedora
Component: atlas
Version: 5
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Quentin Spencer
QA Contact: Fedora Extras Quality Assurance
Whiteboard: bzcl34nup
Depends On:
TreeView+ depends on / blocked
Reported: 2007-04-11 20:49 UTC by charles harris
Modified: 2008-05-06 19:30 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2008-05-06 19:30:23 UTC

Attachments (Terms of Use)

Description charles harris 2007-04-11 20:49:22 UTC
Description of problem:

cblas_dgemm generates illegal instruction error for large arrays.

Version-Release number of selected component (if applicable):


How reproducible:

Steps to Reproduce:
1. Compile
#include <atlas/cblas.h>

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);
    return 1;

2. Compile
gcc -L/usr/lib64/atlas -lcblas blas_error.c -o blas_error

3. Run
Actual results:
Illegal instruction

Expected results:

Additional info:
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.

Comment 1 charles harris 2007-04-13 02:25:33 UTC
Atlas-2.7.30 compiled on my machine works fine for the test program.

Comment 2 Bug Zapper 2008-04-04 06:50:56 UTC
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
the change.

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: 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

Comment 3 Bug Zapper 2008-05-06 19:30:21 UTC
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.

Note You need to log in before you can comment on or make changes to this bug.