kernel trap 12 with interrupts disabled, 5.3-stable

[Pierre-Luc Drouin]

I have updated a system from FreeBSD 4.10 to 5.3 (I did a fresh new 
installation from scatch). At the same time we put a new CPUs in there. 
The system is now a dual Xenon 3.2 GHZ with hyperthreading. When there's 
load on the server, it crashes. Here is what I get on the console:

kernel trap 12 with interrupts disabled
Fatal trap 12: page fault while in kernel mode
cpuid = 3; apic id = 07
fault virtual address   = 0x8
fault code              = supervisor write, page not present
instruction pointer     = 0x8:0xc064973e
stack pointer           = 0x10:0xe338fc00
frame pointer           = 0x10:0xe338fc0c
code segment            = base 0x0, limit 0xfffff, type 0x1b
                       = DPL 0, pres 1, def32 1, gran 1
processor eflags        = resume, IOPL = 0
current process         = 1 (init)
trap number             = 12
panic: page fault
cpuid = 3
spin lock sleepq chain held by 0xc22ad320 for > 5 seconds
What could be the cause?
The system was very stable with FreeBSD 4.10 and only 2 CPUs (1 real and 
1 virtual). When I've seen page faults in the past, it was caused by the 
RAM or the motherboard. Is it almost always the case? Does the fact to 
add 2 new CPUs is more likely to reveal a RAM problem that was not known 
before?

Thanks
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