Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965633AbaLLTXu (ORCPT ); Fri, 12 Dec 2014 14:23:50 -0500 Received: from mx1.redhat.com ([209.132.183.28]:50732 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932531AbaLLTXt (ORCPT ); Fri, 12 Dec 2014 14:23:49 -0500 Date: Fri, 12 Dec 2014 14:23:09 -0500 From: Dave Jones To: Linus Torvalds Cc: Chris Mason , Mike Galbraith , Ingo Molnar , Peter Zijlstra , =?iso-8859-1?Q?D=E2niel?= Fraga , Sasha Levin , "Paul E. McKenney" , Linux Kernel Mailing List Subject: Re: frequent lockups in 3.18rc4 Message-ID: <20141212192309.GA10523@redhat.com> Mail-Followup-To: Dave Jones , Linus Torvalds , Chris Mason , Mike Galbraith , Ingo Molnar , Peter Zijlstra , =?iso-8859-1?Q?D=E2niel?= Fraga , Sasha Levin , "Paul E. McKenney" , Linux Kernel Mailing List References: <20141203184111.GA32005@redhat.com> <20141205171501.GA1320@redhat.com> <1417806247.4845.1@mail.thefacebook.com> <20141211145408.GB16800@redhat.com> <20141212185454.GB4716@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Dec 12, 2014 at 11:14:06AM -0800, Linus Torvalds wrote: > On Fri, Dec 12, 2014 at 10:54 AM, Dave Jones wrote: > > > > Something that's still making me wonder if it's some kind of hardware > > problem is the non-deterministic nature of this bug. > > I'd expect it to be a race condition, though. Which can easily cause > these kinds of issues, and the timing will be pretty random even if > the load is very regular. > > I'm also not sure if the bug ever happens with preemption disabled. After tomorrow, I'm not going to be in front of this machine until Wednesday, so I'll leave a no-preempt build running for the duration. Hopefully that will give us some clues. I might be able to log into it while travelling, so I'll provide updates where possible as long as it doesn't wedge solid. Dave -- 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/