Red Hat 6.2 Warning Message at reboot

[Henry, Jeffrey J (Jeff), ALSVC]

I have several HP Kayak XU800 PCs.  Each have dual 600 MHz processors with
256M of RAM.  I'm running Red Hat 6.2 Kernel 2.2.14-5.0smp.  I use these
machines as call generators so each has a Digi International Data Fire RAS
PTE 48 port (rev10) board installed.  Quite frequently they reboot while
generating calls with the error "in swapper task - not syncing".  However,
on a graceful reboot I've notice an error message stating "WARNING:
unexpected IO-APIC, please mail to [EMAIL PROTECTED]".  Could this
have something to do with the reboots I see when the boxes are under load?
I have attached the log of kernel messages. Any information or assistance
you can offer will be greatly appreciated.

Thanks in advance,

Jeff Henry

 <<messages.kern>> 

messages.kern