From owner-freebsd-questions@FreeBSD.ORG  Thu Aug 23 11:04:46 2007
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 9382816A41B
	for <freebsd-questions@freebsd.org>;
	Thu, 23 Aug 2007 11:04:46 +0000 (UTC) (envelope-from me@janh.de)
Received: from moutng.kundenserver.de (moutng.kundenserver.de
	[212.227.126.188])
	by mx1.freebsd.org (Postfix) with ESMTP id 2AC4413C467
	for <freebsd-questions@freebsd.org>;
	Thu, 23 Aug 2007 11:04:46 +0000 (UTC) (envelope-from me@janh.de)
Received: from d054074.adsl.hansenet.de [80.171.54.74] (helo=janh.freebsd)
	by mrelayeu.kundenserver.de (node=mrelayeu2) with ESMTP (Nemesis),
	id 0MKwtQ-1IOAUW2XEB-0006vs; Thu, 23 Aug 2007 13:04:45 +0200
Message-ID: <46CD69D1.2040009@janh.de>
Date: Thu, 23 Aug 2007 13:04:49 +0200
From: Jan Henrik Sylvester <me@janh.de>
User-Agent: Thunderbird 2.0.0.6 (X11/20070803)
MIME-Version: 1.0
To: questions-list freebsd <freebsd-questions@freebsd.org>
References: <46CD5268.3010704@janh.de>
In-Reply-To: <46CD5268.3010704@janh.de>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-Provags-ID: V01U2FsdGVkX1/h2TMYJNgV+leJtDPIIVpYlsYBBDeW1dohuaO
	hG8iIFzZKTKSXatsjjVDorhT35oUPHovWCg5/oQ1npyo9X7/Ii
	U+iJUhJHImtPWoVYGIMBA==
Cc: rodrigc@FreeBSD.org
Subject: Re: Reproducible panic of 6.2 on double mount ntfs
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 23 Aug 2007 11:04:46 -0000

Jan Henrik Sylvester wrote:
> With '/dev/ad0s1 /mnt/ad0s1 ntfs ro,noauto 0 0' in fstab, if I issue 
> 'mount /mnt/ad0s1' twice, I always get a panic with the message:
> 
> panic: lockmgr: locking against myself

I should have done some more intelligent research before...

kern/89966 (6.0-STABLE) is exactly what I see. (The difference between 
my mount+fstab and manual mount_ntfs is that the first includes ro.)

kern/104393 (7.0-CURRENT) does not even have the ro, but is otherwise 
the same.

kern/71391 (5.2.1-RELEASE) might be related...

I wonder why a panic that seems to be so easy to reproduce is not 
analyzed and fixed -- probably ntfs is simply not very important to 
anyone and the panic can be avoided quite easily.

Since I should be able to avoid issuing repeated execution of mount with 
some concentration (I ran into this four times now), it should not be 
too much of an issue for me, either...

Regards,
Jan Henrik