From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753243AbaJBUDQ (ORCPT ); Thu, 2 Oct 2014 16:03:16 -0400 Received: from e32.co.us.ibm.com ([32.97.110.150]:52447 "EHLO e32.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751334AbaJBUDP (ORCPT ); Thu, 2 Oct 2014 16:03:15 -0400 Date: Thu, 2 Oct 2014 13:03:07 -0700 From: "Paul E. McKenney" To: Mike Lothian Cc: Linux Kernel Mailing List Subject: Re: Hard lockups under high CPU load with DynTicks - RCU Related? Message-ID: <20141002200307.GW5015@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 14100220-0928-0000-0000-000005574DD1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Sep 23, 2014 at 08:32:02AM +0100, Mike Lothian wrote: > Hi > > I've raised https://bugzilla.kernel.org/show_bug.cgi?id=84131 and > attempted to bisect > > The bug I'm stumbling on happens on both and Intel Sandybridge and AMD > Kabini system - it manifests itself as a hard lockup when the system > is under high load > > If I switch off DynTicks the problem doesn't happen - I bisected by > compiling Chromium marking each one good or bad if the system starts > to lockup > > I'm not sure if I've filed the bug under the right Product / Component > > Please let me know if you'd like any more diagnostics The commit that your bisection located is a merge commit. Could you please try each of the branches that were merged? That might allow you to pinpoint the actual commit. Thanx, Paul