On Monday 26 March 2012 12:50 pm, Jung-uk Kim wrote:
> On Monday 26 March 2012 01:42 am, Poul-Henning Kamp wrote:
> > I tried -current as of approx one day ago and was greeted with a
> > kernel printf flooding the screen with something about a ACPI(?)
> > mutex(?) refcount increasing.
> >
> > I were unable to divine any identifying info from the messages
> > because the screen scrolled too fast and the message was longer
> > than the width of the screen.
> >
> > I were unable to get a core-dump and had to reset the laptop
> > (Lenovo T400s)
>
> I am well aware of the issue and identified the regression was
> introduced in these changes:
>
> http://svnweb.freebsd.org/base/head/sys/contrib/dev/acpica/componen
>ts/namespace/nspredef.c?r1=231844&r2=233250&view=patch
> http://svnweb.freebsd.org/base/head/sys/contrib/dev/acpica/componen
>ts/namespace/nsrepair.c?r1=231844&r2=233250&view=patch
> http://svnweb.freebsd.org/base/head/sys/contrib/dev/acpica/include/
>aclocal.h?r1=229989&r2=233250&view=patch
> http://svnweb.freebsd.org/base/head/sys/contrib/dev/acpica/include/
>acnamesp.h?r1=229989&r2=233250&view=patch
>
> I notified the upstream maintainers and they are working very hard
> to correct the issue ATM.  I'll update ACPICA as soon as they find
> a fix but please revert the changes for now if you are in hurry.

FYI, it seems it will take more time than I originally thought.  So, I 
had no choice but to locally revert these changes for now.  It is 
committed as r233555.

Jung-uk Kim
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