Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759913AbYBZCJv (ORCPT ); Mon, 25 Feb 2008 21:09:51 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753672AbYBZCJn (ORCPT ); Mon, 25 Feb 2008 21:09:43 -0500 Received: from fg-out-1718.google.com ([72.14.220.159]:31350 "EHLO fg-out-1718.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753504AbYBZCJm (ORCPT ); Mon, 25 Feb 2008 21:09:42 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=gamma; h=from:to:subject:date:user-agent:cc:references:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:message-id:sender; b=Pq4Ubv/9BTFoqRU4/fsmLuCeI+yJoHM6bm/Rq9pGI40SXpJYRnWTRsqiqX/V7exp9ARJDs1ygbwyucRDOSDtPGAhrsC0F1M0dX6ZceQHSuKsdVBu1mbugtYeS78zdshEe0GqoJ49QkQieyPzbbmA6eUj4YdfA4lB/0Mis4xF47k= From: Karsten Wiese To: paulmck@linux.vnet.ibm.com Subject: Re: 2.6.25-rc2 rcupreempt WARN after suspend to ram Date: Tue, 26 Feb 2008 03:09:35 +0100 User-Agent: KMail/1.9.6 (enterprise 0.20071204.744707) Cc: linux-kernel@vger.kernel.org, Thomas Gleixner , Rafael Wysocki , Steven Rostedt References: <200802231341.02597.fzu@wemgehoertderstaat.de> <200802241638.15902.fzu@wemgehoertderstaat.de> <20080224182800.GA10194@linux.vnet.ibm.com> In-Reply-To: <20080224182800.GA10194@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200802260309.36360.fzu@wemgehoertderstaat.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1955 Lines: 47 Am Sonntag, 24. Februar 2008 schrieb Paul E. McKenney: > On Sun, Feb 24, 2008 at 04:38:15PM +0100, Karsten Wiese wrote: > > Am Samstag, 23. Februar 2008 schrieb Karsten Wiese: > > > Am Samstag, 23. Februar 2008 schrieb Paul E. McKenney: > > > > On Sat, Feb 23, 2008 at 01:41:02PM +0100, Karsten Wiese wrote: > > > > > Hi, > > > > > > > > > > This appeared in dmesg after > > > > > $ echo core > /sys/power/pm_test > > > > > followed by 3 cycles of > > > > > $ echo mem > /sys/power/state > > > > > . .config attached. > > > > > > > > > > dmesg excerpt (, full ~1MByte available): > > > > > > > > Does this tree have http://lkml.org/lkml/2008/1/29/208 applied? > > > > > > Yes. This tree was linus' git head as of yesterday or the day before. > > > > Updated to git-head of today, same test and .config, different symptoms > > like in this thread: http://lkml.org/lkml/2008/2/23/260 > > Later in this thread, Alan Cox said it looked like irq problems. > > Maybe also the rcupreemt related WARN_ON I saw are caused by irq problems. > > Might be, but am taking a closer look at the interaction between irq, > dynticks, and rcupreempt in any case. [Added Rafael, Thomas and Steven to CC] The "different symptoms" above are indeed unrelated and solved by reverting "commit 559bbe6cbd0d8c68d40076a5f7dc98e3bf5864b2 power_state: get rid of write-only variable in SATA" The cpu_hotplug code used by suspend together with hr_timer and nohz looks suspicious: $ echo 0 > /sys/devices/system/cpu/cpu1/online $ echo 1 > /sys/devices/system/cpu/cpu1/online (repeat until dmesg|tail shows WARNs; here it took 2 iterations) causes symptoms like in 1st message of this thread again. Thanks, Karsten -- 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/