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Date: Sat, 28 Feb 2004 15:24:29 -0800 (PST)
From: Nate Lawson <nate@root.org>
To: Robert Klein <RoKlein@roklein.de>
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cc: current@freebsd.org
Subject: Re: 5.2.1-RC2: Fatal trap 12 when ACPI enabled
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Please see the handbook section on acpi debugging.  In particular, you
should try disabling various subsystems to isolate the problem
(debug.acpi.disable, in the man page).  Also, a full dmesg is more
valuable than this snip.  Try unplugging the USB hard drive, etc.

Also, enable ddb in your kernel config and type "tr" when you get the
trap.

-Nate