Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752118AbaKZFLr (ORCPT ); Wed, 26 Nov 2014 00:11:47 -0500 Received: from mx1.redhat.com ([209.132.183.28]:54255 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751054AbaKZFLp (ORCPT ); Wed, 26 Nov 2014 00:11:45 -0500 Date: Wed, 26 Nov 2014 00:11:31 -0500 From: Dave Jones To: Linus Torvalds Cc: =?iso-8859-1?Q?J=FCrgen_Gro=DF?= , the arch/x86 maintainers , Kernel Mailing List Subject: Re: frequent lockups in 3.18rc4 Message-ID: <20141126051131.GA21318@redhat.com> Mail-Followup-To: Dave Jones , Linus Torvalds , =?iso-8859-1?Q?J=FCrgen_Gro=DF?= , the arch/x86 maintainers , Kernel Mailing List References: <20141114213124.GB3344@redhat.com> <20141115213405.GA31971@redhat.com> <20141116014006.GA5016@redhat.com> <20141126002501.GA11752@redhat.com> <5475596A.9010301@suse.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit 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 Tue, Nov 25, 2014 at 09:09:45PM -0800, Linus Torvalds wrote: > On Nov 25, 2014 8:39 PM, "J?rgen Gro?" wrote: > > > > I COULD trigger it with 3.17. Took much longer, but I've seen it once. > > And from Xen hypervisor data it was clear it was the same bug (cpu > > spinning in pmd_lock()). > > I'm still hoping you can give a back trace. I'd like to know what access it > is that can trigger this, and preferably what the call chain to it was... > > I do believe it happened in 3.17, I just want to understand the but more - > not just apply the fix.. > > Most of Dave's lockup back traces did not have the whole page fault in > them, so while Dave has seen this too, there might be different symptoms... Before giving 3.17 a multi-day workout, I'll try rc6 with J?rgen's patch to see if that makes any difference at all for me. 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/