From owner-svn-src-head@FreeBSD.ORG  Wed Mar 21 22:07:46 2012
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From: Jung-uk Kim <jkim@FreeBSD.org>
To: Andreas Tobler <andreast@freebsd.org>
Date: Wed, 21 Mar 2012 18:07:36 -0400
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	Nathan Whitehorn <nwhitehorn@freebsd.org>
Subject: Re: svn commit: r233250 - in head: share/man/man4 sys/amd64/acpica
	sys/contrib/dev/acpica sys/contrib/dev/acpica/common
	sys/contrib/dev/acpica/compiler
	sys/contrib/dev/acpica/components/debugger sys/co...
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On Wednesday 21 March 2012 05:18 pm, Andreas Tobler wrote:
> On 21.03.12 15:31, Nathan Whitehorn wrote:
> > On 03/20/12 14:37, Jung-uk Kim wrote:
> >> Author: jkim
> >> Date: Tue Mar 20 21:37:52 2012
> >> New Revision: 233250
> >> URL: http://svn.freebsd.org/changeset/base/233250
> >>
> >> Log:
> >>     Merge ACPICA 20120320.
> >
> > After this, I get an endless series of "Large reference count -
> > (increasingly large hex number) - utdelete-491" on the console
> > when trying to boot my laptop. How should I go about trying to
> > debug this?
>
> I have the same situation on my IBM T60. Only a boot with
> kernel.old helps....

I just reported the issue to upstream becuase I cannot reproduce it.  
Please stay tuned.

Jung-uk Kim