Date: Fri, 27 Apr 2007 10:04:34 +0800 From: Ganbold <ganbold@micom.mng.net> To: Thomas Quinot <thomas@FreeBSD.ORG> Cc: FreeBSD Stable Mailing List <freebsd-stable@freebsd.org>, mjacob@FreeBSD.org, linimon@FreeBSD.org, bug-followup@freensd.org Subject: Re: kern/112119: system hangs when starts k3b on RELENG_6 Message-ID: <46315A32.9050900@micom.mng.net> In-Reply-To: <20070425215130.GA13949@melamine.cuivre.fr.eu.org> References: <200704251327.l3PDRBvK019864@www.freebsd.org> <20070425215130.GA13949@melamine.cuivre.fr.eu.org>
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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. > >
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