From owner-freebsd-bugs@FreeBSD.ORG  Wed Jun 23 08:37:02 2004
Return-Path: <owner-freebsd-bugs@FreeBSD.ORG>
Delivered-To: freebsd-bugs@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id 2013716A4CE; Wed, 23 Jun 2004 08:37:02 +0000 (GMT)
Received: from critter.freebsd.dk (critter.freebsd.dk [212.242.86.163])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 7B7F343D1F; Wed, 23 Jun 2004 08:37:01 +0000 (GMT)
	(envelope-from phk@critter.freebsd.dk)
Received: from critter.freebsd.dk (localhost.freebsd.dk [127.0.0.1])
	by critter.freebsd.dk (8.12.11/8.12.11) with ESMTP id i5N8aqEu015674;
	Wed, 23 Jun 2004 10:36:52 +0200 (CEST)
	(envelope-from phk@critter.freebsd.dk)
To: Alan Cox <alc@cs.rice.edu>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
In-Reply-To: Your message of "Wed, 23 Jun 2004 03:28:22 CDT."
             <20040623082822.GM18577@cs.rice.edu> 
Date: Wed, 23 Jun 2004 10:36:52 +0200
Message-ID: <15673.1087979812@critter.freebsd.dk>
Sender: phk@critter.freebsd.dk
cc: alc@FreeBSD.org
cc: freebsd-bugs@FreeBSD.org
cc: Bruce M Simpson <bms@FreeBSD.org>
Subject: Re: kern/67898: page fault while in kernel mode 
X-BeenThere: freebsd-bugs@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Bug reports <freebsd-bugs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-bugs>,
	<mailto:freebsd-bugs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-bugs>
List-Post: <mailto:freebsd-bugs@freebsd.org>
List-Help: <mailto:freebsd-bugs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-bugs>,
	<mailto:freebsd-bugs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 23 Jun 2004 08:37:02 -0000

In message <20040623082822.GM18577@cs.rice.edu>, Alan Cox writes:
>On Wed, Jun 23, 2004 at 07:00:23AM +0000, Bruce M Simpson wrote:
>> Synopsis: page fault while in kernel mode
>> 
>> Responsible-Changed-From-To: freebsd-bugs->alc
>> Responsible-Changed-By: bms
>> Responsible-Changed-When: Wed Jun 23 07:00:07 GMT 2004
>> Responsible-Changed-Why: 
>> One for alc@, he was here recently
>> 
>> http://www.freebsd.org/cgi/query-pr.cgi?pr=67898
>
>This should actually go to phk@.  The problem here appears to be that
>the geomified swap strategy routines are no longer setting b_dev
>(except to NULL in swapdev_strategy()).  Consequently, devtoname()
>dereferences a NULL pointer.
>
>I can imagine a quick fix, but Poul may have better ideas.

I don't really have a good idea.  The devtoname() is patently invalid
in the face of paging to NFS so I guess we'd have to stick a name
string in swdevt and print that if we don't just remove the devtoname()
entirely.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.