Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933345AbaLMOQ3 (ORCPT ); Sat, 13 Dec 2014 09:16:29 -0500 Received: from userp1040.oracle.com ([156.151.31.81]:47759 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932945AbaLMOQ1 (ORCPT ); Sat, 13 Dec 2014 09:16:27 -0500 Message-ID: <548C4A06.5020301@oracle.com> Date: Sat, 13 Dec 2014 09:15:34 -0500 From: Sasha Levin User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0 MIME-Version: 1.0 To: Ingo Molnar , Linus Torvalds CC: Dave Jones , Chris Mason , Mike Galbraith , Peter Zijlstra , =?windows-1252?Q?D=E2niel_Fraga?= , "Paul E. McKenney" , Linux Kernel Mailing List Subject: Re: frequent lockups in 3.18rc4 References: <20141205171501.GA1320@redhat.com> <1417806247.4845.1@mail.thefacebook.com> <20141211145408.GB16800@redhat.com> <20141212185454.GB4716@redhat.com> <20141213081953.GG32572@gmail.com> <20141213082751.GA1526@gmail.com> In-Reply-To: <20141213082751.GA1526@gmail.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-Source-IP: ucsinet21.oracle.com [156.151.31.93] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/13/2014 03:27 AM, Ingo Molnar wrote: > > * Ingo Molnar wrote: > >> >> * 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. >>> >>> And we know that the scheduler has an integer overflow under >>> Sasha's loads, although I didn't hear anything from Ingo and >>> friends about it. Ingo/Peter, you were cc'd on that report, >>> where at least one of the multiplcations in wake_affine() ended >>> up overflowing.. >> >> Just to make sure, is there any other wake_affine report other >> than the one in this thread? (I tried a wake_affine full text >> search on my inbox and didn't find anything that appeared >> relevant.) > > Found the report from Sasha: > > sched: odd values for effective load calculations > > right? Yup, that's the one. Thanks, Sasha -- 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/