From owner-freebsd-hackers@FreeBSD.ORG Fri Dec 2 13:54:28 2005 Return-Path: X-Original-To: freebsd-hackers@freebsd.org Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id CE00B16A41F; Fri, 2 Dec 2005 13:54:28 +0000 (GMT) (envelope-from jhb@freebsd.org) Received: from speedfactory.net (mail6.speedfactory.net [66.23.216.219]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1C1E943D53; Fri, 2 Dec 2005 13:54:27 +0000 (GMT) (envelope-from jhb@freebsd.org) Received: from server.baldwin.cx (unverified [66.23.211.162]) by speedfactory.net (SurgeMail 3.5b3) with ESMTP id 3008241 for multiple; Fri, 02 Dec 2005 08:52:29 -0500 Received: from zion.baldwin.cx (zion.baldwin.cx [192.168.0.7]) (authenticated bits=0) by server.baldwin.cx (8.13.1/8.13.1) with ESMTP id jB2DsN0I002436; Fri, 2 Dec 2005 08:54:24 -0500 (EST) (envelope-from jhb@freebsd.org) From: John Baldwin To: freebsd-hackers@freebsd.org Date: Fri, 2 Dec 2005 08:54:18 -0500 User-Agent: KMail/1.8.3 References: <200512021100.03167.yuri@irfu.se> In-Reply-To: <200512021100.03167.yuri@irfu.se> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Message-Id: <200512020854.20959.jhb@freebsd.org> X-Spam-Status: No, score=-2.8 required=4.2 tests=ALL_TRUSTED autolearn=failed version=3.0.2 X-Spam-Checker-Version: SpamAssassin 3.0.2 (2004-11-16) on server.baldwin.cx X-Server: High Performance Mail Server - http://surgemail.com r=1653887525 Cc: Yuri Khotyaintsev , freebsd-stable@freebsd.org Subject: Re: Fatal trap 12: page fault while in kernel mode X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Dec 2005 13:54:28 -0000 On Friday 02 December 2005 05:00 am, Yuri Khotyaintsev wrote: > I have the following panic occurring several times a week. The machine is > an NFS server, and it usually panics early in the morning, when first > people try to access it. After reboot it may work OK for 1-2 days, and th= en > panics again. I have tried changing memory and replacing disk which was > exported via NFS, but nothing helped :( > > Any suggestion on how to fix this panic will be very much appreciated ! This panic (in propagate_priority) is usually caused when a thread goes to= =20 sleep while holding a mutex (which is forbidden). If you enable INVARIANTS= =20 and/or WITNESS you should get a better panic, and with WITNESS you will eve= n=20 be warned when a thread goes to sleep while holding a mutex. However, thes= e=20 options do introduce considerable execution overhead, and sometimes that=20 overhead changes the timing enough to hide the race. :( =2D-=20 John Baldwin =A0<>< =A0http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" =A0=3D =A0http://www.FreeBSD.org