From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthony Liguori Subject: Re: BUG: soft lockup - CPU#0 stuck for 13s! [swapper:0] Date: Wed, 25 Aug 2010 11:19:26 -0500 Message-ID: <4C75428E.2020504@codemonkey.ws> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org To: Boris Dolgov Return-path: Received: from mail-qy0-f181.google.com ([209.85.216.181]:36661 "EHLO mail-qy0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752752Ab0HYQT3 (ORCPT ); Wed, 25 Aug 2010 12:19:29 -0400 Received: by qyk33 with SMTP id 33so713153qyk.19 for ; Wed, 25 Aug 2010 09:19:29 -0700 (PDT) In-Reply-To: Sender: kvm-owner@vger.kernel.org List-ID: On 08/25/2010 11:14 AM, Boris Dolgov wrote: > On Wed, Aug 25, 2010 at 5:15 PM, Boris Dolgov wrote: > >> Hello! >> >> I try to use KVM on slackware host and centos5 guest with SMP. >> >> When the server is idle, I get following errors in /var/log/messages: >> http://pastebin.com/4RrMVuXq >> >> Guest: >> [root@centos-5-x64 ~]# uname -a >> Linux centos-5-x64.slave 2.6.18-194.11.1.el5 #1 SMP Tue Aug 10 >> 19:05:06 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux >> >> Start command: /usr/local/qemu/bin/qemu-system-x86_64 -name >> centos-5-x64 -m 384 -smp 2 -cdrom >> /root/CentOS-5.5-x86_64-netinstall.iso -drive >> index=0,media=disk,if=virtio,file=/dev/mapper/vgvm-centos5x64,boot=on >> -vnc 0.0.0.0:1 -net nic,macaddr=fe:e1:de:ad:57:22 -net >> tap,script=/usr/local/qemu/bin/qemu-ifup -monitor stdio -usb >> -usbdevice tablet -enable-kvm >> >> Host: >> root@superserver:~# uname -a >> Linux superserver 2.6.35.3 #4 SMP Mon Aug 23 12:17:01 MSD 2010 x86_64 >> Intel(R) Xeon(R) CPU X3460 @ 2.80GHz GenuineIntel GNU/Linux >> root@superserver:~# /usr/local/qemu/bin/qemu-system-x86_64 -version >> QEMU PC emulator version 0.12.5 (qemu-kvm-0.12.5), Copyright (c) >> 2003-2008 Fabrice Bellard >> >> What does it mean? >> > The problem also reproduces without SMP or USB for a guest. > > I have installed Debian 5.0.5 to another VM, and the problem is > unreproducible under it: > debian-5-x64:~# uname -a > Linux debian-5-x64.slave 2.6.26-2-amd64 #1 SMP Thu Aug 19 00:37:36 UTC > 2010 x86_64 GNU/Linux > > Should I post it to redhat bugzilla as redhat bug, or it is KVM bug? > Or post it to the CentOS bugzilla since you're not using Red Hat. There's been various time related issues in RHEL5.x so my inclination would be that it's not an upstream issue until you verify it with the latest upstream. Regards, Anthony Liguori > Also, I have noticed a strange thing. In top on host, Debian qemu > process consumes nearly 1% of cpu, but CentOS qemu process consumes > nearly 20-30%, even when VM is idle. > > The problem also reproduces on centos-i386 guest and doesn't reproduce > on debian-5-i386. > >