[Bug 130694] double fault and kernel crash running pcgamess

[Andy Wettstein]

Public bug reported:

Starting two instances of a program called pcgamess causes bad things to
happen on a dapper SMP kernel.

I receive this error message:
[43342099.730000] double fault, gdt at dffdd000 [255 bytes]

Another message is logged also logged about a soft error on the CPU and
is usually followed by a kernel dump.

A tarball of the binaries that do this can be retrieved here:
http://w3.physics.uiuc.edu/~ajw/gamess.tgz

Run the crashme.sh script.

With the sleep between starting processes, it might not crash the
machine, but the double fault should happen.

If the sleep is removed the system immediately crashes in all of my
testing.

I've tested this on an SMP Redhat Enterprise 4 machine and it doesn't crash the system, but I do get errors like this:
 p4_error: OOPS: semop lock failed

So maybe there is some problems with IPC?

** Affects: linux-source-2.6.15 (Ubuntu)
     Importance: Undecided
         Status: New

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double fault and kernel crash running pcgamess
https://bugs.launchpad.net/bugs/130694
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