From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751984AbcF3LJ7 (ORCPT ); Thu, 30 Jun 2016 07:09:59 -0400 Received: from www.linutronix.de ([62.245.132.108]:46479 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751646AbcF3LJ6 (ORCPT ); Thu, 30 Jun 2016 07:09:58 -0400 Date: Thu, 30 Jun 2016 12:24:26 +0200 (CEST) From: Thomas Gleixner To: Mike Galbraith cc: Borislav Petkov , Peter Zijlstra , x86-ml , lkml Subject: Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because the skew is too large: In-Reply-To: <1467280185.9949.19.camel@gmail.com> Message-ID: References: <20160627200631.GA3678@pd.tnic> <20160629171619.GA3691@pd.tnic> <1467273448.9949.7.camel@gmail.com> <1467278139.9949.16.camel@gmail.com> <1467280185.9949.19.camel@gmail.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 Thu, 30 Jun 2016, Mike Galbraith wrote: > On Thu, 2016-06-30 at 11:42 +0200, Thomas Gleixner wrote: > > > So there was no watchdog firing for 525 seconds ???? > > Yup, seems so. if that's fully reproducible can you please enable the timer and softirq tracepoints along with your trace printks and stop the trace when that watchdog triggers? extra trace printk below. thanks tglx diff --git a/kernel/time/timer.c b/kernel/time/timer.c index 3e0c4e60bf6a..418c45ab5ad5 100644 --- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -1438,6 +1438,7 @@ static unsigned long __next_timer_interrupt(struct timer_base *base) clk >>= LVL_CLK_SHIFT; clk += adj; } + trace_printk("next %lu\n", next); return next; }