Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965482AbXH0V7K (ORCPT ); Mon, 27 Aug 2007 17:59:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1764463AbXH0V6I (ORCPT ); Mon, 27 Aug 2007 17:58:08 -0400 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:40659 "EHLO amd.ucw.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1764313AbXH0V6E (ORCPT ); Mon, 27 Aug 2007 17:58:04 -0400 Date: Mon, 27 Aug 2007 23:58:23 +0200 From: Pavel Machek To: "Rafael J. Wysocki" Cc: Jeff Chua , rusty@rustycorp.com.au, vatsa@in.ibm.com, zwane@arm.linux.org.uk, kernel list Subject: Re: cpu hotplug support broken in 2.6.23-rc3 Message-ID: <20070827215822.GH3398@elf.ucw.cz> References: <20070827104350.GA2073@elf.ucw.cz> <20070827213248.GF3398@elf.ucw.cz> <200708272359.32484.rjw@sisk.pl> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200708272359.32484.rjw@sisk.pl> X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.11+cvs20060126 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2351 Lines: 87 On Mon 2007-08-27 23:59:31, Rafael J. Wysocki wrote: > On Monday, 27 August 2007 23:32, Pavel Machek wrote: > > On Mon 2007-08-27 22:36:57, Jeff Chua wrote: > > > On 8/27/07, Pavel Machek wrote: > > > > On Mon 2007-08-27 12:43:50, Pavel Machek wrote: > > > > > Hi! > > > > > > > > > > Trying to do few onlines/offlines reliably hangs my machine (thinkpad > > > > > x60, i386 architecture). > > > > > > I just 3 cycles of on-line/off-line on 2.6.23-rc3 on ThinkPad x60s, > > > and my system still survives. > > > > Can you try 20-or-so tests? Mine hangs randomly, so it survived 4 or > > so cycles at one point. > > > > ...or maybe difference is in the .config, or maybe I broken something > > in my kernel sources.... > > Well, something seems to be wrong with the CPU hotplug, but it's insanely > difficult to reproduce on my boxes. > > I bet on one of the notifiers blocking while waiting on a frozen task. It happens reliably for me, with this script... and randomly, when I just echo 0/1 > online from commandline... so it should not be anything with the frozen tasks. echo test > /sys/power/disk echo disk > /sys/power/state reliably hangs on resume in the attached script. It works ok with nosmp. Pavel #!/bin/bash killall klogd echo -n "testing refrigerator (testproc)..." echo testproc > /sys/power/disk echo disk > /sys/power/state echo "okay" sleep 2 echo -n "testing drivers (test)..." echo test > /sys/power/disk echo disk > /sys/power/state echo "okay" sleep 2 echo -n "testing swsusp (reboot)..." echo reboot > /sys/power/disk echo disk > /sys/power/state echo "okay" sleep 2 echo -n "testing s2ram..." s2ram echo "okay" sleep 2 echo -n "testing swsusp (shutdown)..." echo shutdown > /sys/power/disk echo disk > /sys/power/state echo "okay" sleep 2 echo -n "testing swsusp (platform)..." echo platform > /sys/power/disk echo disk > /sys/power/state echo "okay" sleep 2 echo -n "testing s2ram..." s2ram echo "okay" -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/