From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Kuhles Subject: Problems with KVM-79 Date: Sun, 07 Dec 2008 18:37:31 +0100 Message-ID: <493C09DB.7030802@aquatix.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: QUOTED-PRINTABLE To: kvm@vger.kernel.org Return-path: Received: from eternity.serverbox.de ([91.200.108.23]:59042 "EHLO eternity.serverbox.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752467AbYLGSCj (ORCPT ); Sun, 7 Dec 2008 13:02:39 -0500 Received: from [192.168.2.150] (p579B0B8C.dip.t-dialin.net [87.155.11.140]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: web1p1) by eternity.serverbox.de (Postfix) with ESMTP id BB19DB986D0 for ; Sun, 7 Dec 2008 18:37:34 +0100 (CET) Sender: kvm-owner@vger.kernel.org List-ID: Hi, I was running KVM-76 with 2 CentOS 5.2 64bit VMs until a few days ago. Everything was working fine. However, I needed to install a third VM ru= nning Windows 2008 Server 64bit, which randomly kept crashing the host system= with a kernel panic, so I thought, why not upgrade to KVM-79, wanted to do tha= t for a while anyways. Now, Windows 2008 Server is running absolutely fine, no = more host crashes. However, the two CentOS VMs crash on me every once in a while = for no good reason. This apparently seems to happen more often when one of the= CentOS VMs is under load, like compiling something. I had one of the VMs crash= on me like 10 times to get a PHP 5.2.7 compile thru. I tried starting up the = crashing VM with -no-kvm, and the problem at least seemed to go away. I didn't l= eave it running like this too long as the VM is in production and with -no-kvm, everything ran terribly slow. Here's some infos about the system I'm using: Hardware: - Intel Core2Quad Q6600 - 8 GB RAM (checked with memtest86+ to make sure it's good) - 2x 320 GB Seagate drives in a software RAID-1 Software: - Host system: CentOS 5.2 64bit - VMs: 2x CentOS 5.2 64bit (same kernel as host, see below), 1x Windows= Server 2008 64bit, all available updates installed - manually compiled KVM-79 - Host kernel version: 2.6.18-92.1.18.el5 qemu commands: VM1 (CentOS 5.2 64bit): export DISPLAY=3D:1 qemu-kvm -daemonize -localtime -no-acpi -hda /kvm/vm1.img -m 1024 -boot= c -net nic,macaddr=3D52:54:00:00:01:00,model=3De1000 -net tap,ifname=3Dtap0,sc= ript=3Dno VM2 (Windows Server 2008 64bit): export DISPLAY=3D:2 qemu-kvm -daemonize -localtime -hda /kvm/vm2.img -m 2048 -boot c -net nic,macaddr=3D52:54:00:00:01:01,model=3De1000 -net tap,ifname=3Dtap1,sc= ript=3Dno VM3 (CentOS 5.2 64bit): export DISPLAY=3D:3 qemu-kvm -daemonize -localtime -hda /kvm/vm3.img -m 1024 -boot c -net nic,macaddr=3D52:54:00:00:01:02,model=3De1000 -net tap,ifname=3Dtap2,sc= ript=3Dno (qemu-kvm is a symlink to qemu-system-x86_64, inspired by the CentOS pa= ckages provided by lfarkas.org. Also tried those instead of compiling manually= , btw - same problem.) When the crashes happen, the qemu processes are still running on the ho= st, but consume a lot of CPU. Checking the vnc console, there is no output what= soever from the VMs, just a blank, black screen that doesn't react to anything= (even tried SysRq, nothing). Also, what I noticed is that CentOS 5.2 spits loads of errors about ker= nel modules (don't have the exact message ready now, but I could get it lat= er on if needed) when booting up as soon as -smp >=3D2 is used. This also did no= t happen with KVM-76. When I run with -smp 1 or leave that parameter out, everyt= hing works well - except for the random crashes. As this did in no way happen with KVM-76, I figure there must me a bug = in the most recent version causing this issue. I'd appreciate any help you could provide. If there's anything else I c= an do, like provide debugging output etc., please just let me know. --=20 Mit freundlichen Gruessen / Best regards Chris Kuhles Geschaeftsleitung / Managing Director Aquatix IT-Services e.K. Telefon: +49 69 24750456-0 M=FCnzgasse 6 Telefax: +49 69 24750456-1 60311 Frankfurt am Main E-Mail: ck@aquatix.de AG Frankfurt am Main, HRA 44038 Web: http://www.aquatix.de/