Description of problem:

Background - Dell T7400 with 2 quad core Xeon processors (E5405) and 32G of RAM running RHEL 5.3.  we have the auditing system configured as well runing the NISPOM ruleset.

We are attempting to use condor on these systems (we have 2 of them) allowing condor to attempt to use 6 of the 8 cores.  When telling condor to use more than 2 cores the system freezes beyond recovery.  The machines will not crash when using only 2 cores.  I read up on the apci threads and attempted to use RH kernel 2.6.18-156 and was able to reproduce the freeze.  Once frozen, the system obviously does not respond to any network/consolve probing (as you would expect).  It's dead...

The condor tools run as a non-privileged user...

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

RHEL 5.3 using either kernels 2.6.18-128 or 2.6.18.156 for X86_64 platforms.


How reproducible:

So far...  Configure condor to assine slots to more than 2 of the 8 cores.  Crash is almost immediate once the test jobs are submitted.  However, if you configure condor to only used 2 cores - the jobs complete as expected.  I am guessing this might be a kernel bug since the whole machine dies...

To be fair:  I am not 100% sure condor is not to blame - but since it runs as a non-root user the kernel should not crash - condor should....