Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754621AbaLBRPk (ORCPT ); Tue, 2 Dec 2014 12:15:40 -0500 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:64371 "EHLO mx0b-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754065AbaLBRPj (ORCPT ); Tue, 2 Dec 2014 12:15:39 -0500 Date: Tue, 2 Dec 2014 12:14:53 -0500 From: Chris Mason Subject: Re: frequent lockups in 3.18rc4 To: Linus Torvalds CC: Mike Galbraith , Ingo Molnar , Peter Zijlstra , =?iso-8859-1?q?D=E2niel?= Fraga , Dave Jones , Sasha Levin , "Paul E. McKenney" , Linux Kernel Mailing List Message-ID: <1417540493.21136.3@mail.thefacebook.com> In-Reply-To: References: <20141127225637.GA24019@redhat.com> <547b8a45.6e608c0a.20f9.1002@mx.google.com> <547bbe36.48548c0a.105c.779c@mx.google.com> <20141201191431.GA17385@linux.vnet.ibm.com> <547ccf74.a5198c0a.25de.26d9@mx.google.com> <20141201230339.GA20487@ret.masoncoding.com> <1417529606.3924.26.camel@maggy.simpson.net> X-Mailer: geary/0.8.2 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8"; format=flowed X-Originating-IP: [192.168.16.4] X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.13.68,1.0.33,0.0.0000 definitions=2014-12-02_07:2014-12-02,2014-12-02,1970-01-01 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 kscore.is_bulkscore=0 kscore.compositescore=0 circleOfTrustscore=120.659590407225 compositescore=0.140620555742602 urlsuspect_oldscore=0.140620555742602 suspectscore=0 recipient_domain_to_sender_totalscore=0 phishscore=0 bulkscore=0 kscore.is_spamscore=0 recipient_to_sender_totalscore=0 recipient_domain_to_sender_domain_totalscore=2524143 rbsscore=0.140620555742602 spamscore=0 recipient_to_sender_domain_totalscore=8 urlsuspectscore=0.9 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=7.0.1-1402240000 definitions=main-1412020148 X-FB-Internal: deliver Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Dec 2, 2014 at 11:33 AM, Linus Torvalds wrote: > On Tue, Dec 2, 2014 at 6:13 AM, Mike Galbraith > wrote: > > At the same time, the whole "incapacitated by the rt throttle long > enough for the hard lockup detector to trigger" commentary about that > skip_clock_update issue does make me go "Hmmm..". It would certainly > explain Dave's incomprehensible watchdog messages.. Dave's first email mentioned that he had panic on softlockup enabled, but even with that off the box wasn't recovering. In my trinity runs here, I've gotten softlockup warnings where the box eventually recovered. I'm wondering if some of the "bad" commits in the bisection are really false positives where the box would have been able to recover if we'd killed off all the trinity procs and given it time to breath. -chris -- 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/