From owner-freebsd-stable@FreeBSD.ORG Fri Apr 27 02:04:39 2007 Return-Path: X-Original-To: freebsd-stable@freebsd.org Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 236C516A406; Fri, 27 Apr 2007 02:04:39 +0000 (UTC) (envelope-from ganbold@micom.mng.net) Received: from publicd.ub.mng.net (publicd.ub.mng.net [202.179.0.88]) by mx1.freebsd.org (Postfix) with ESMTP id 98D4B13C45B; Fri, 27 Apr 2007 02:04:38 +0000 (UTC) (envelope-from ganbold@micom.mng.net) Received: from [202.179.0.164] (helo=daemon.micom.mng.net) by publicd.ub.mng.net with esmtpa (Exim 4.63 (FreeBSD)) (envelope-from ) id 1HhFp5-000N3V-Fi; Fri, 27 Apr 2007 11:04:35 +0900 Message-ID: <46315A32.9050900@micom.mng.net> Date: Fri, 27 Apr 2007 10:04:34 +0800 From: Ganbold User-Agent: Thunderbird 2.0.0.0 (X11/20070425) MIME-Version: 1.0 To: Thomas Quinot References: <200704251327.l3PDRBvK019864@www.freebsd.org> <20070425215130.GA13949@melamine.cuivre.fr.eu.org> In-Reply-To: <20070425215130.GA13949@melamine.cuivre.fr.eu.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: FreeBSD Stable Mailing List , mjacob@FreeBSD.org, linimon@FreeBSD.org, bug-followup@freensd.org Subject: Re: kern/112119: system hangs when starts k3b on RELENG_6 X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 27 Apr 2007 02:04:39 -0000 Thomas Quinot wrote: > * Ganbold, 2007-04-25 : > > >>> Description: >>> >> With atapi-cam.c (rev 1.42.2.3) when running k3b application, system >> completely hangs on k3b splash screen and I had to use power button only >> to restart the machine. >> > > Extremely strange. I can't offer any definite solution at this point, > since I have no idea how this change could cause a system to hang. Here > are a few possible investigation ideas: > > * AFAIK k3b is just a front-end for command-line tools. You should > determine what exact commands are spawned by k3b to identify which of > these is causing the apparent hang; > > * it would also be useful to enable CAM debugging options (see > "man 4 cam", option CAMDEBUG, and flags CAM_DEBUG_TRACE and > CAM_DEBUG_SUBTRACE) and to capture all console output up to the hang > (for example using a serial console) > > * if Scott's hunch of an interrupt storm is correct, then this issue > might be related to the DMA problem described under PR 103602, so > it would be useful to try the last patch I sent on that PR: > http://www.freebsd.org/cgi/query-pr.cgi?pr=103602&getpatch=12 > > * if all else fails, please let me know if the attached patch, which > reverts part of rev. 1.42.2.3, changes anything. > I will try http://www.freebsd.org/cgi/query-pr.cgi?pr=103602&getpatch=12 patch later today and let you know. thanks, Ganbold > Thomas. > >