Re: kvm-88: KVM_APIC_READ: read reserved register b0

[Daniel Bareiro <daniel-listas@gmx.net>]

[-- Attachment #1: Type: text/plain, Size: 2083 bytes --]

On Friday, 28 August 2009 12:04:02 +0200,
Christoph Lechner wrote:

> Hi all,

Hi Christoph.
 
> running kvm-88 on a 2.6.26-1-amd64 kernel (stock Debian 5.0 kernel), I
> get the syslog on the host system flooded with the message:
> 
> Aug 28 11:49:40 reactor kernel: [124035.611782] KVM_APIC_READ: read
> reserved register b0
> 
> The guest is running Debian 5.0 as well. Kernel 2.6.26-2-486. qemu is
> started with the command line:
> /opt/kvm-88/bin/qemu-system-x86_64 -hda web-int.img -m 512 -net
> nic,vlan=0,macaddr=52:54:12:34:02:01 -net tap,vlan=0 -k de -vnc :4
> 
> 
> The message is always the same, only the timestamp differs. The log msg
> is generated quite often, at least 10000 times per minute. The guest
> system has 100% CPU usage, so has the qemu process on the host. I was
> doing a search engine crawler run -- lots of network I/O -- , when the
> log was filled. See the impressive growth rate of the syslog (crawler
> running)
> 
> reactor:/virt# ls -l /var/log/syslog; sleep 60; ls -l /var/log/syslog
> -rw-r----- 1 root adm 17765119 2009-08-28 11:47 /var/log/syslog
> -rw-r----- 1 root adm 19124492 2009-08-28 11:48 /var/log/syslog
> (at least 99.9% of the new log entries are of the same kind as the one
> above ...)

Also I am observing this behavior in one of my hosts with KVM-88 and
Linux 2.6.30 compiled both by myself on Ubuntu GNU/Linux Hardy Heron
server amd64, as I've mentioned in a previous [1] mail. Guests has
Debian GNU/Linux Lenny with stock kernel 2.6.26.

I was trying if with model=virtio the problem were solved, but was not
successful. It would seem that the cause is due to something related to
hardware of the host (is it possible?), since I have other hosts in
which I use both the same version of KVM and kernel, also both compiled
by myself, and I'm not having this problem.

Regards,
Daniel

[1] http://thread.gmane.org/gmane.comp.emulators.kvm.devel/39324
-- 
Fingerprint: BFB3 08D6 B4D1 31B2 72B9  29CE 6696 BF1B 14E6 1D37
Powered by Debian GNU/Linux Squeeze - Linux user #188.598

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 197 bytes --]