Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752115AbaLCU7i (ORCPT ); Wed, 3 Dec 2014 15:59:38 -0500 Received: from www.linutronix.de ([62.245.132.108]:55615 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751153AbaLCU7h (ORCPT ); Wed, 3 Dec 2014 15:59:37 -0500 Date: Wed, 3 Dec 2014 21:59:20 +0100 (CET) From: Thomas Gleixner To: Dave Jones cc: John Stultz , Linus Torvalds , Chris Mason , Mike Galbraith , Ingo Molnar , Peter Zijlstra , =?ISO-8859-15?Q?D=E2niel_Fraga?= , Sasha Levin , "Paul E. McKenney" , Linux Kernel Mailing List Subject: Re: frequent lockups in 3.18rc4 In-Reply-To: <20141203204439.GA5019@redhat.com> Message-ID: References: <20141201230339.GA20487@ret.masoncoding.com> <1417529606.3924.26.camel@maggy.simpson.net> <1417540493.21136.3@mail.thefacebook.com> <20141203184111.GA32005@redhat.com> <20141203190045.GB32005@redhat.com> <20141203204439.GA5019@redhat.com> User-Agent: Alpine 2.11 (DEB 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 3 Dec 2014, Dave Jones wrote: > On Wed, Dec 03, 2014 at 09:37:10PM +0100, Thomas Gleixner wrote: > > > Right, that resulted in a delta > 0. I have no idea how we could > > create a negative delta via wrapping the HPET around, i.e. HPET being > > 96 seconds ahead of TSC. > > > > This looks more like a genuine TSC wreckage. So we have these possible > > causes: > > > > 1) SMI > > > > 2) Power states > > > > 3) Writing to the wrong MSR > > > > So I assume that 1/2 are a non issue. They should surface in normal > > non fuzzed operation as well. > > > > Dave, does that TSC unstable thing always happen AFTER you started > > fuzzing? If yes, what is the fuzzer doing this time? > > I've seen it even after doing just a kernel build sometimes, It's > happened so regularly I've just assumed "the tsc is crap on this box". > > On occasion I even see it shortly after boot, while idle. Can you please provide the cpuinfo flags of that box? Thanks, tglx -- 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/