From owner-freebsd-hackers@FreeBSD.ORG  Wed Aug 15 08:48:36 2007
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id DA7C116A41B
	for <freebsd-hackers@freebsd.org>; Wed, 15 Aug 2007 08:48:36 +0000 (UTC)
	(envelope-from rdivacky@vlk.vlakno.cz)
Received: from vlakno.cz (vlk.vlakno.cz [62.168.28.247])
	by mx1.freebsd.org (Postfix) with ESMTP id 938C513C491
	for <freebsd-hackers@freebsd.org>; Wed, 15 Aug 2007 08:48:36 +0000 (UTC)
	(envelope-from rdivacky@vlk.vlakno.cz)
Received: from localhost (localhost [127.0.0.1])
	by vlakno.cz (Postfix) with ESMTP id 95ED18C107E;
	Wed, 15 Aug 2007 10:28:58 +0200 (CEST)
X-Virus-Scanned: amavisd-new at vlakno.cz
Received: from vlakno.cz ([127.0.0.1])
	by localhost (vlk.vlakno.cz [127.0.0.1]) (amavisd-new, port 10024)
	with ESMTP id WCaXx3WxU-RQ; Wed, 15 Aug 2007 10:28:57 +0200 (CEST)
Received: from vlk.vlakno.cz (localhost [127.0.0.1])
	by vlakno.cz (Postfix) with ESMTP id A25E28C0F54;
	Wed, 15 Aug 2007 10:28:57 +0200 (CEST)
Received: (from rdivacky@localhost)
	by vlk.vlakno.cz (8.13.8/8.13.8/Submit) id l7F8SvM3059092;
	Wed, 15 Aug 2007 10:28:57 +0200 (CEST) (envelope-from rdivacky)
Date: Wed, 15 Aug 2007 10:28:57 +0200
From: Roman Divacky <rdivacky@freebsd.org>
To: Nex Mon <sugarfreemonkey@gmail.com>
Message-ID: <20070815082857.GA59064@freebsd.org>
References: <1fc8a2a60708142327p3f9ff079l345d47f9ceb6f489@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1fc8a2a60708142327p3f9ff079l345d47f9ceb6f489@mail.gmail.com>
User-Agent: Mutt/1.4.2.3i
Cc: freebsd-hackers@freebsd.org
Subject: Re: questions on nonsleepable lock
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 15 Aug 2007 08:48:36 -0000

On Wed, Aug 15, 2007 at 02:27:56PM +0800, Nex Mon wrote:
> Hello All,
> 
> Can someone point me out or explain the technical details of this kernel
> panic:
> 
> sleeping thread (tid 100093, pid 2676) owns nonsleepable lock
> panic: sleeping thread

it just says that some thread owns a nonsleepable lock and went sleeping.
are you using WITNESS?