From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757437Ab2IYQo7 (ORCPT ); Tue, 25 Sep 2012 12:44:59 -0400 Received: from mail-pb0-f46.google.com ([209.85.160.46]:57074 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757207Ab2IYQo5 (ORCPT ); Tue, 25 Sep 2012 12:44:57 -0400 Date: Tue, 25 Sep 2012 09:44:54 -0700 From: Greg KH To: =?utf-8?B?UGF3ZcWC?= Sikora Cc: linux-kernel@vger.kernel.org, arekm@pld-linux.org, baggins@pld-linux.org Subject: Re: [3.5.4] rcu_sched self-detected stall on CPU { 1} (t=54862991 jiffies) Message-ID: <20120925164454.GA22330@kroah.com> References: <1377033.GMb6SBRYYa@pawels> <20120924173633.GA2451@kroah.com> <2429639.puuGestFgj@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <2429639.puuGestFgj@localhost> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Sep 25, 2012 at 06:31:36PM +0200, Paweł Sikora wrote: > On Monday 24 of September 2012 10:36:33 Greg KH wrote: > > On Mon, Sep 24, 2012 at 10:05:23AM +0200, Paweł Sikora wrote: > > > Hi, > > > > > > with the new stable line i'm observing strange locks on my old amd-phenom-II mini-server. > > > here's a dmesg: > > > > Did this show up in 3.5.3? If not, can you run 'git bisect' to find the > > problem patch? > > heh, the old good kernel put some light on this issue. > > Sep 25 08:50:24 nexus kernel: [60330.301639] Clocksource tsc unstable (delta = -474690884 ns) > Sep 25 08:50:24 nexus kernel: [60330.325477] ------------[ cut here ]------------ > Sep 25 08:50:24 nexus kernel: [60330.325484] WARNING: at /home/users/builder/rpm/BUILD/kernel-2.6.37.6/linux-2.6.37/net/sched/sch_generic.c:258 dev_watchdog+0x25d/0x270() > Sep 25 08:50:24 nexus kernel: [60330.325486] Hardware name: GA-MA785GMT-UD2H > Sep 25 08:50:24 nexus kernel: [60330.325487] NETDEV WATCHDOG: eth0 (r8169): transmit queue 0 timed out > (...) > Sep 25 08:50:25 nexus kernel: [60330.851093] Switching to clocksource acpi_pm > > afaics, this amd-phenom cpu does the cpu frequency scaling and causes plain 'tsc' timer > instability which leads to network card watchdog timeout (i can login via local console > while any network traffic is dead). on the recent 3.5.x kernel the 'clocksource unstable' > message appears *after* 'task blocked' flood and there's no clear info about watchog timeout. > currently i'm testing hpet clocksource becasue better tsc modes (constant_tsc, nonstop_tsc) > aren't present in /sys/devices/system/clocksource/clocksource0/available_clocksource while > cpu supports them. I'm sorry, I don't understand, that's a 2.6.37 kernel you are comparing this to. Where did this problem show up? In 3.5.4 where 3.5.3 was fine? Or somewhere else? confused, greg k-h