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From: Hans Petter Selasky <hselasky@c2i.net>
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Date: Wed, 5 Aug 2009 16:03:33 +0200
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Cc: Ed Schouten <ed@80386.nl>, Robert Watson <rwatson@freebsd.org>,
	FreeBSD Current <current@freebsd.org>,
	Lucius Windschuh <lwindschuh@googlemail.com>
Subject: Re: uaudio attach panic: Giant not locked
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On Wednesday 05 August 2009 13:43:11 Robert Watson wrote:
> On Wed, 5 Aug 2009, Ed Schouten wrote:
> > * Lucius Windschuh <lwindschuh@googlemail.com> wrote:
> >> So I updated my machine to CURRENT r196062 and use a USB audio
> >> converter. Attaching it to the machine leads to a kernel panic:
> >>
> >> <snip>
> >
> > I suspect this has something to do with the Newbus locking, which causes
> > some pieces of code to run without Giant held, while they previously did.
>
> There's a patch in the re@ queue to re-add Giant around newbus attachment,
> per John Baldwin's request.  However, committing that patch is stalled
> while issues with the svn->cvs export of the new RELENG_8 branch are
> resolved.  I expect to see the patch go into the tree RSN.
>

Try this patch:

http://perforce.freebsd.org/chv.cgi?CH=167030

--HPS