From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752958AbaHUO4K (ORCPT ); Thu, 21 Aug 2014 10:56:10 -0400 Received: from mail-lb0-f176.google.com ([209.85.217.176]:46995 "EHLO mail-lb0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751758AbaHUO4I (ORCPT ); Thu, 21 Aug 2014 10:56:08 -0400 MIME-Version: 1.0 In-Reply-To: <1408566691-3023-1-git-send-email-iacobcatalin@gmail.com> References: <20140811200931.GA18865@redhat.com> <1408566691-3023-1-git-send-email-iacobcatalin@gmail.com> Date: Thu, 21 Aug 2014 16:56:06 +0200 Message-ID: Subject: Re: nohz fail (was: perf related boot hang.) From: Frederic Weisbecker To: Catalin Iacob Cc: Dave Jones , Peter Zijlstra , Linux Kernel Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2014-08-20 22:31 GMT+02:00 Catalin Iacob : > I've also just hit what seems to be the same panic in 3.17-rc1 (ignore the 1 > local patch, it's an unrelated change in a comment) twice in less than 1 > hour. Hitting this twice in a short amount of time seems to be proof that the > 3.17 merge window made it trigger more often. Both times I was running a grep > over a Firefox build tree which was taking a long time. > > The stacktraces are slightly different but both have the "cancel timer from a > timer, followed by nmi" pattern. Pictures of the 2 stacktraces: > https://drive.google.com/file/d/0B_fRjDygGZSNY0RIc2dyYTExTjg/edit?usp=sharing > https://drive.google.com/file/d/0B_fRjDygGZSNS1pSWFkteURrOTQ/edit?usp=sharing Hi Catalin, Dave, Can you please test the series I just posted: "[RFC PATCH 0/9] nohz: Nohz full kick fixes"? It should fix the issues. Thanks.