From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751583AbXCDLez (ORCPT ); Sun, 4 Mar 2007 06:34:55 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751581AbXCDLez (ORCPT ); Sun, 4 Mar 2007 06:34:55 -0500 Received: from smtp.osdl.org ([65.172.181.24]:34463 "EHLO smtp.osdl.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751400AbXCDLez (ORCPT ); Sun, 4 Mar 2007 06:34:55 -0500 Date: Sun, 4 Mar 2007 03:34:45 -0800 From: Andrew Morton To: Mariusz Kozlowski Cc: linux-kernel@vger.kernel.org Subject: Re: 2.6.21-rc2-mm1 Message-Id: <20070304033445.cff1148f.akpm@linux-foundation.org> In-Reply-To: <200703041007.31800.m.kozlowski@tuxland.pl> References: <20070302030026.5eef0c92.akpm@linux-foundation.org> <200703041007.31800.m.kozlowski@tuxland.pl> X-Mailer: Sylpheed version 2.2.7 (GTK+ 2.8.17; x86_64-unknown-linux-gnu) 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 On Sun, 4 Mar 2007 10:07:31 +0100 Mariusz Kozlowski wrote: > I'm experiencing weird system hangs with recent -mm. After a few hours of uptime for no > obvious reason system hangs and is (almost) unusable until reset. > > a few facts: > > - this happens on random basis without anything obvious that could trigger it > - if some music is played and system hangs the music starts looping in thight loop causing weird > sound effects > - sometimes I'm able to switch from X to console, it takes a few seconds to switch though > - system is eating 100% CPU what is shown by my laptop fans > - when I switch to console I can issue SysRq commands but they do not work i.e.: > SysRq + P shows only the first line: "SysRq: Show Regs" > - in console in which I can log into the system I'm unable to type > - in console where syslog is logging *.* I'm able to type > - if the wifi card was plugged into the system before the hang happend the networking seems to work ok > - when I reattach my pcmcia wifi card it doesn't get detected (nothing happens) > - when I try to login to my laptop from remote machine the line "login:" and that's it, nothing > more happens > - system logs show nothing interesting as even if there is some usable debug info I'm unable to > SysRq + S and read it after reboot > > With 2.6.20-mm1 it happened as well. I get the feeling that 2.6.20-rc2-mm1 needs a bit more uptime > to hit this bug. Thanks. Are you sure that the kermel hasn't already oopsed when this happens? (netconsole will help). The sysrq-P failure is a shame. Does sysrq-P work as expected _before_ the system has failed? It sounds to me like a simple log-level thing. Did you try typing alt-sysrq-7 first?