From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S275068AbTHGFZh (ORCPT ); Thu, 7 Aug 2003 01:25:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S275073AbTHGFZh (ORCPT ); Thu, 7 Aug 2003 01:25:37 -0400 Received: from fw.osdl.org ([65.172.181.6]:10932 "EHLO mail.osdl.org") by vger.kernel.org with ESMTP id S275068AbTHGFZg (ORCPT ); Thu, 7 Aug 2003 01:25:36 -0400 Message-ID: <32841.4.4.25.4.1060233933.squirrel@www.osdl.org> Date: Wed, 6 Aug 2003 22:25:33 -0700 (PDT) Subject: Re: Newbie debugging question From: "Randy.Dunlap" To: In-Reply-To: <200308070230.49802.mail@richardstevens.de> References: <200308070230.49802.mail@richardstevens.de> X-Priority: 3 Importance: Normal Cc: X-Mailer: SquirrelMail (version 1.2.11) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > Hi, > > I've been searching the net for quite some time now without success so I > decided to ask the professionals. I'm looking for kernelhacker newbie > friendly documentation on how to figure out a little more about a kernel > lockup to be able to give the developer of a device driver some more info. I suggest asking on the kernelnewbies mailing list (see kernelnewbies.org). Also, some people started on this web page, but it's only a beginning: http://lse.sourceforge.net/debugging/ > The problem is that after a while the machine locks up with Caps Lock and > Scroll lock blinking. I don't see any logs and no messages on the console. I > found some posts describing similar events and it was said that the kernel > is not completely dead in this state. Is there a way to get some more > information? Where should I start reading. > > Please CC me since I'm not subscribed. What kernel version? That would have some effects on the answer. Serial console is the usual option/route. If it boots completely, you could also try netconsole (or, dare I say it, usb console). Or LKCD (lkcd.sf.net), or kmsgdump (2.5.75/2.6.0 at http://www.xenotime.net/linux/kmsgdump/2.5.75/). ~Randy