APIC error on CPU0 (UP APIC kernel)

I have some single-processr Dell Poweredge 2450 servers that I'm trying to move to 2.4. They have been running 2.2 SMP kernels for a while with no problem (to take advantage of the supposed benefit of using the ioapic). 2.4 SMP kernels seem to work fine, but using a 2.4.1 or 2.4.2 UP kernel with

Re: APIC error on CPU0 (UP APIC kernel)

Excerpts from mail: 1-Mar-101 Re: APIC error on CPU0 (UP .. by Arnaldo C. de Melo@conec > can you try 2.4.2-ac8 and tell us the results? No change (I used 2.4.2-ac9, since that was available...). (The watchdog doesn't trip and display output, but eventually the errors stop and rebooting is possib