Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964842Ab3GEQCp (ORCPT ); Fri, 5 Jul 2013 12:02:45 -0400 Received: from www.linutronix.de ([62.245.132.108]:45814 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751803Ab3GEQCn (ORCPT ); Fri, 5 Jul 2013 12:02:43 -0400 Date: Fri, 5 Jul 2013 18:02:41 +0200 (CEST) From: Thomas Gleixner To: Dave Jones cc: Linus Torvalds , Linux Kernel , Ingo Molnar , Peter Anvin , Peter Zijlstra Subject: Re: Yet more softlockups. In-Reply-To: <20130705160043.GF325@redhat.com> Message-ID: References: <20130704015525.GA8486@redhat.com> <20130705143821.GB325@redhat.com> <20130705160043.GF325@redhat.com> User-Agent: Alpine 2.02 (DEB 1266 2009-07-14) 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 Content-Length: 1114 Lines: 22 On Fri, 5 Jul 2013, Dave Jones wrote: > On Fri, Jul 05, 2013 at 05:15:07PM +0200, Thomas Gleixner wrote: > > On Fri, 5 Jul 2013, Dave Jones wrote: > > > > > BUG: soft lockup - CPU#3 stuck for 23s! [trinity-child1:14565] > > > perf samples too long (2519 > 2500), lowering kernel.perf_event_max_sample_rate to 50000 > > > INFO: NMI handler (perf_event_nmi_handler) took too long to run: 238147.002 msecs > > > > So we see a softlockup of 23 seconds and the perf_event_nmi_handler > > claims it did run 23.8 seconds. > > > > Are there more instances of NMI handler messages ? > > [ 2552.006181] perf samples too long (2511 > 2500), lowering kernel.perf_event_max_sample_rate to 50000 > [ 2552.008680] INFO: NMI handler (perf_event_nmi_handler) took too long to run: 500392.002 msecs Yuck. Spending 50 seconds in NMI context surely explains a softlockup :) -- 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/