From owner-freebsd-hackers@FreeBSD.ORG  Fri Feb 17 20:14:38 2012
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Date: Fri, 17 Feb 2012 15:14:36 -0500
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From: Ryan Stone <rysto32@gmail.com>
To: Vijay Singh <vijju.singh@gmail.com>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: Panic in 8.1 in softclock(): mutex Giant not owned at
	../../../../sys/kern/kern_mutex.c:185
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On Wed, Feb 15, 2012 at 10:20 PM, Vijay Singh <vijju.singh@gmail.com> wrote:
> I hit the assert in line 405. So right after locking Giant, it is
> found unlocked!!!

Try running kldload/kldunload with INVARIANTS enabled.  I would
suspect that you're hitting a case where the kldload code is unlocking
Giant when it doesn't own it.