Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754651Ab3JOIHF (ORCPT ); Tue, 15 Oct 2013 04:07:05 -0400 Received: from mailout03.t-online.de ([194.25.134.81]:40737 "EHLO mailout03.t-online.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752276Ab3JOIG7 (ORCPT ); Tue, 15 Oct 2013 04:06:59 -0400 Message-ID: <525CF790.2090805@t-online.de> Date: Tue, 15 Oct 2013 10:06:40 +0200 From: Knut Petersen User-Agent: Mozilla/5.0 (X11; Linux i686; rv:24.0) Gecko/20100101 Thunderbird/24.0 MIME-Version: 1.0 To: paulmck@linux.vnet.ibm.com CC: Linus Torvalds , Ingo Molnar , Thomas Gleixner , =?UTF-8?B?RnLDqWTDqXJpYyBXZWlzYmVj?= =?UTF-8?B?a2Vy?= , Greg KH , linux-kernel Subject: Re: [BUG 3.12.rc4] Oops: unable to handle kernel paging request during shutdown References: <525BD08C.2080101@t-online.de> <20131014212830.GD5790@linux.vnet.ibm.com> <525C67B0.8020303@t-online.de> <20131014231603.GF5790@linux.vnet.ibm.com> <20131015005938.GA13655@linux.vnet.ibm.com> In-Reply-To: <20131015005938.GA13655@linux.vnet.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ID: ECp0TTZZghHk6IBxYZEYWNdbSmOtpoj2JrZF6qjImhLT2bQxRuMvKTncuCX18tHQzn X-TOI-MSGID: 477c0bb0-3f64-4a78-b41e-0d474d718a03 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1382 Lines: 31 On 15.10.2013 02:59, Paul E. McKenney wrote: > On Mon, Oct 14, 2013 at 04:16:03PM -0700, Paul E. McKenney wrote: >> On Mon, Oct 14, 2013 at 11:52:48PM +0200, Knut Petersen wrote: >>> On 14.10.2013 23:28, Paul E. McKenney wrote: >>>> On Mon, Oct 14, 2013 at 10:53:03AM -0700, Linus Torvalds wrote: >>>> I´ll run some tests with those debug parameters tomorrow. >>>> Any chance of a look at the .config file? >>> Attached. >> Thank you! Looks like a pretty standard RCU setup. Just to make sure >> I saw it correctly -- you are running NR_CPUS=1? Getting races to happen >> in that mode is truly impressive! Yes. The AOpen i915GMm-hfs is a desktop board with mobile chipset for one Pentium-M. As a musician I need an absolutely silent system, and the low power consumption of that technology is a nice add-on. > Ah, thing... When running with only one CPU, both of synchronize_rcu_bh() > and synchronize_sched() become essentially no-ops. Anything that expected > them to actually sleep would then break. > > However, because you are running with CONFIG_PREEMPT=y, synchronize_rcu() > will still block. > > Thanx, Paul > -- 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/