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Date: Fri, 28 Nov 2008 12:23:36 -0800
From: Kris Kennaway <kris@FreeBSD.org>
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To: Richard Tector <richardtector@thekeelecentre.com>
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Cc: freebsd-stable@freebsd.org
Subject: Re: Random hangs with 7.1-PRE
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Richard Tector wrote:
> I'm not discounting hardware here, but I'm having problems with a 
> previously stable amd64 system (dmesg attached) now running:
> FreeBSD 7.1-PRERELEASE #1: Wed Nov 26 00:10:41 GMT 2008
> and previously running a RELENG_7 from around Oct 15th which also 
> exhibited the problem.
> 
> The system appears to hang with SSH terminals eventually timing out, and 
> no other services being available. The odd thing is, when I go to the 
> console, I can switch between terminals with Alt-F2, etc, but can not 
> type anything. Pressing the power button a couple of times gives an acpi 
> not ready message, so it doesn't appear the system has completely hung.
> 
> The system is in a cool room and under little load running basic 
> services: samba, postgres, dhcp, etc. Never seen problems with the 
> machine previously.
> 
> Does anyone have any thoughts or suggestions on narrowing down the cause?

See the developers handbook chapter on kernel debugging for full 
instructions on how to gather the necessary information to proceed.

Kris