From owner-freebsd-current@FreeBSD.ORG  Sun May 18 16:09:53 2003
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 3C51337B40A
	for <current@FreeBSD.ORG>; Sun, 18 May 2003 16:09:53 -0700 (PDT)
Received: from HAL9000.homeunix.com (12-233-57-131.client.attbi.com
	[12.233.57.131])
	by mx1.FreeBSD.org (Postfix) with ESMTP id A3C6543F85
	for <current@FreeBSD.ORG>; Sun, 18 May 2003 16:09:52 -0700 (PDT)
	(envelope-from das@FreeBSD.ORG)
Received: from HAL9000.homeunix.com (localhost [127.0.0.1])
	by HAL9000.homeunix.com (8.12.9/8.12.5) with ESMTP id h4IN9nhG003540;
	Sun, 18 May 2003 16:09:49 -0700 (PDT)
	(envelope-from das@FreeBSD.ORG)
Received: (from das@localhost)
	by HAL9000.homeunix.com (8.12.9/8.12.5/Submit) id h4IN9mq0003539;
	Sun, 18 May 2003 16:09:48 -0700 (PDT)
	(envelope-from das@FreeBSD.ORG)
Date: Sun, 18 May 2003 16:09:48 -0700
From: David Schultz <das@FreeBSD.ORG>
To: Giorgos Keramidas <keramida@ceid.upatras.gr>
Message-ID: <20030518230948.GA3465@HAL9000.homeunix.com>
Mail-Followup-To: Giorgos Keramidas <keramida@ceid.upatras.gr>,
	current@freebsd.org
References: <20030514232428.GA731@gothmog.gr>
	<20030518053557.GA223@HAL9000.homeunix.com>
	<20030518104943.GA35028@gothmog.gr>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20030518104943.GA35028@gothmog.gr>
cc: current@FreeBSD.ORG
Subject: Re: Panic with swap-backed md devices
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 18 May 2003 23:09:53 -0000

On Sun, May 18, 2003, Giorgos Keramidas wrote:
> On 2003-05-17 22:35, David Schultz <das@FreeBSD.org> wrote:
> > On Thu, May 15, 2003, Giorgos Keramidas wrote:
> > > Trying to create and destroy a swap-backed md device results in panics
> > > with today's CURRENT.  I was trying to make a new -t swap md disk to
> > > test the problem described in a PR.  Using the following small shell
> > > script I noticed that it always causes a panic when mdconfig -d is run:
> > >
> > > 	mdconfig -a -t swap -s 100m -u 10
> > > 	disklabel -r -w md10 auto
> > > 	newfs -O 1 -b 8192 -s 1024 md10
> > > 	mount /dev/md10 /mnt
> > > 	mount
> > > 	umount /mnt
> > > 	mount
> > > 	mdconfig -d -u 10
> >
> > The following patch should fix the panic, but there's a small
> > vm_object leak that's still unfixed.  I'll look into that.
> 
> Thanks :)
> I'm CVSup'ing now and will build a kernel to test it in 1-2 hours.

Actually alc fixed it in src/sys/dev/md/md.c,v1.99, along with the
leak.  Apparently it's intentional that vm_pager_deallocate() is
not the inverse of vm_pager_allocate().  :-O