From owner-freebsd-stable@FreeBSD.ORG  Wed Jun 29 23:12:32 2005
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Date: Wed, 29 Jun 2005 19:12:29 -0400 (EDT)
From: Matt Juszczak <matt@atopia.net>
To: Kris Kennaway <kris@obsecurity.org>
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Cc: Gleb Smirnoff <glebius@freebsd.org>, freebsd-stable@freebsd.org
Subject: Re: FreeBSD -STABLE servers repeatedly crashing.
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On Wed, 29 Jun 2005, Kris Kennaway wrote:

> On Tue, Jun 28, 2005 at 11:26:06AM -0400, Matt Juszczak wrote:
>
>>> OK, when it crashes next and is sat at the "db>" prompt, type "tr" and
>>> press enter to get a trace.  Copy this down (or have a serial console to
>>> capture the output).  Also, try typing "call doadump()" and see if that
>>> succeeds in generating a crash dump.  How were you trying to generate
>>> one before?
>>>
>>> Gavin
>>>
>>>
>>
>> I can't type anything.  The machine locks up.
>>
>> See: http://paste.atopia.net/126
>>
>> After CPUID: 1, the machine locks cold and nothing else is printed to
>> the screen.
>
> Try two things:
>
> 1) adding 'options KDB_STOP_NMI' to your kernel config.
>
> 2) If you still can't get it to break to DDB, then compile up a
> debugging kernel, run kgdb on it (as described in the developers'
> handbook), and list *(0xblah) where that address is the value of the
> instruction pointer in the trap message (e.g. 0xc6644eff in your paste
> above).  That might at least be a start.
>
> Kris


OK :) I'll try this next time it crashes.  I actually disabled ipf a few 
nights ago and it hasn't crashed since... knock on wood.