Re: Freebsd 6.2 panic

On Tue, May 29, 2007 at 10:56:40PM +0200, didier derny wrote:
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

Is it always the exact same panic or is it random?

A box here had a few random "trap 12 page fault" panics recently,
especially while booting up cold but also at run time, and the
problem turned out to be bad capacitors on the motherboard.

If you have physical access look at the capacitors on the board
to see if they are bulged of even leak.

cannot dump. no dump device defined

You might want to configure dumping, see dumpon(8).
Look at the traces you get from the dumps:

kgdb /boot/kernel/kernel <dumpfile>
bt

It helps to run a kernel compiled with DEBUG=-g.
I think this is default in GENERIC on 6.2.

If the crashes are at seemingly random points in the kernel
code you probably have a hardware problem. If it's always the
same trace then post it.

--
stefan
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