From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755402Ab1GLGjI (ORCPT ); Tue, 12 Jul 2011 02:39:08 -0400 Received: from vs244178.vserver.de ([62.75.244.178]:37457 "EHLO smtp.eikelenboom.it" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754607Ab1GLGjG convert rfc822-to-8bit (ORCPT ); Tue, 12 Jul 2011 02:39:06 -0400 X-Greylist: delayed 341 seconds by postgrey-1.27 at vger.kernel.org; Tue, 12 Jul 2011 02:39:06 EDT Date: Tue, 12 Jul 2011 08:33:17 +0200 From: Sander Eikelenboom Organization: Eikelenboom IT services X-Priority: 3 (Normal) Message-ID: <1981046693.20110712083317@eikelenboom.it> To: Konrad Rzeszutek Wilk CC: "Paul E. McKenney" , julie Sullivan , , Subject: Re: [Xen-devel] Re: PROBLEM: 3.0-rc kernels unbootable since -rc3 In-Reply-To: <20110711193021.GA2996@dumpdata.com> References: <20110710032510.GG6014@linux.vnet.ibm.com> <20110710171626.GK6014@linux.vnet.ibm.com> <20110710173530.GA16954@linux.vnet.ibm.com> <20110710214639.GP6014@linux.vnet.ibm.com> <20110710231449.GQ6014@linux.vnet.ibm.com> <20110711162450.GA22913@dumpdata.com> <20110711171337.GK2245@linux.vnet.ibm.com> <20110711193021.GA2996@dumpdata.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Monday, July 11, 2011, 9:30:22 PM, you wrote: >> >> Hmmm... Does the stall repeat about every 3.5 minutes after the first stall? > Starting Configure read-only root support... > [ 81.335070] INFO: rcu_sched_state detected stalls on CPUs/tasks: { 0} (detected by 3, t=60002 jiffies) > [ 81.335091] sending NMI to all CPUs: > [ 261.367071] INFO: rcu_sched_state detected stalls on CPUs/tasks: { 0} (detected by 3, t=240034 jiffies) > [ 261.367092] sending NMI to all CPUs: > [ 441.399066] INFO: rcu_sched_state detected stalls on CPUs/tasks: { 0} (detected by 3, t=420066 jiffies) > [ 441.399089] sending NMI to all CPUs: >> >> One thing to try would be to disable CONFIG_RCU_FAST_NO_HZ. I wouldn't >> expect this to have any effect, but might be worth a try. It is really > Did not help. >> intended for small battery-powered systems. >> Just as a note, i'm also seeing some stalls from domU's running a 3.0-rc kernel from you master tree (about 2 week old). But it seems the first occurrences are not as quick after being booted. Unfortunately i haven't got time to investigate more this week. -- Sander