From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gleb Natapov Subject: Re: kernel 3.10.1 - "NMI received for unknown reason" Date: Tue, 30 Jul 2013 08:31:34 +0300 Message-ID: <20130730053134.GG28372@redhat.com> References: <51F2BF0F.5060404@sp.consulting.lsexperts.de> <20130726183910.GC3482@redhat.com> <51F6315F.4050205@sp.consulting.lsexperts.de> <20130729091637.GA18009@redhat.com> <51F6D578.5030105@sp.consulting.lsexperts.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: kvm@vger.kernel.org To: Stefan Pietsch Return-path: Received: from mx1.redhat.com ([209.132.183.28]:39054 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751835Ab3G3Fbk (ORCPT ); Tue, 30 Jul 2013 01:31:40 -0400 Content-Disposition: inline In-Reply-To: <51F6D578.5030105@sp.consulting.lsexperts.de> Sender: kvm-owner@vger.kernel.org List-ID: On Mon, Jul 29, 2013 at 10:50:00PM +0200, Stefan Pietsch wrote: > On 29.07.2013 11:16, Gleb Natapov wrote: > > On Mon, Jul 29, 2013 at 11:09:51AM +0200, Stefan Pietsch wrote: > >> On 26.07.2013 20:39, Gleb Natapov wrote: > >>> On Fri, Jul 26, 2013 at 08:25:19PM +0200, Stefan Pietsch wrote: > >>>> Hi all, > >>>> > >>>> starting a virtual machine (Debian sid) with KVM on my host running > >>>> kernel 3.10.1 (Debian 3.10-1-686-pae) produces these messages: > >>>> > >>> Are those messages printed by a host or a guest? > >> > >> The host shows the messages. > >> > >>>> [ 765.522920] Uhhuh. NMI received for unknown reason 31 on CPU 0. > >>>> [ 765.522927] Do you have a strange power saving mode enabled? > >>>> [ 765.522930] Dazed and confused, but trying to continue > >>>> [ 770.487732] Uhhuh. NMI received for unknown reason 21 on CPU 0. > >>>> [ 770.487740] Do you have a strange power saving mode enabled? > >>>> [ 770.487742] Dazed and confused, but trying to continue > >>>> [ 846.340966] Uhhuh. NMI received for unknown reason 31 on CPU 1. > >>>> [ 846.340973] Do you have a strange power saving mode enabled? > >>>> [ 846.340976] Dazed and confused, but trying to continue > >>>> [ 847.563023] Uhhuh. NMI received for unknown reason 31 on CPU 0. > >>>> [ 847.563029] Do you have a strange power saving mode enabled? > >>>> [ 847.563032] Dazed and confused, but trying to continue > >> > >> Is it safe to ignore them? > >> > > They should not happen. What is the last kernel version you tried that > > does not produce them? Can you verify that they do not happen without > > guest running? What is the qemu command line you are using to start the > > guest and what "cat /proc/cpuinfo" looks like in the guest? > > The Debian wheezy kernel (3.2.46) does not show this behaviour. > It is directly related to KVM and I found out that replacing the option > "-cpu coreduo" with "-cpu kvm32" does not generate the NMI messages. > What happen if you run perf on your host (perf record -a)? Do you see same NMI messages? -- Gleb.