Freebsd 6.2 panic

I have some machines running php/mysql/postfix
from time to time the computers running FreeBSD 6,2
crashes with the following messages

fatal trap 12:page fault while in kernel mode
cpuid=0; apic id=00
fault virtual address = 0x104
fault code = supervisor read, page not present
instruction pointer= 0x20:0xc066c731
stack pointer=0x28:0xe74fec90
frame pointer=0x28:0xe74fec9c
code segment=base 0x0,limit 0xfffff,type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflag=resume,IOPL=0
current process=5 (thread taskq)
trap number=12
panic page fault
cpuid=0
uptime:16h7m48s
cannot dump. no dump device defined
Automatic rebbot in 15 second - press a key on the console to abort
Rebooting
cpu_reset:stopping other CPU

does anyone has an idea on what I can do to solve this problem ?

thanks for your help


--
didier

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