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From: Mark Atkinson <atkin901@gmail.com>
Date: Thu, 11 Mar 2010 10:25:17 -0800
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Cc: freebsd-fs@freebsd.org
Subject: Re: proliant server lockups with freebsd-amd64-stable (2010-03-10)
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On 03/11/10 04:39, Kai Gallasch wrote:
> Hi.
> 
> I have some trouble with an opteron server locking up spontaneously. It looses
> all networks connectivity and even through console I can get no shell.
> 
> Lockups occur mostly under disk load (periodic daily, bacula backup
> running, make buildworld/buildkernel) and I can provoke them easily.

try adding:

vm.pmap.pg_ps_enabled="0"

to /boot/loader.conf and reboot.

Long thread reference:

http://thread.gmane.org/gmane.os.freebsd.current/121035/focus=121457

possible AMD "errata 147"