On 05/26/2010 11:31 AM, Alexander Graf wrote:
On 26.05.2010, at 19:10, Orion Poplawski wrote:
On 05/25/2010 12:21 AM, Gleb Natapov wrote:
Adding kvm to CC.
On Mon, May 24, 2010 at 04:06:32PM +0000, Orion Poplawski wrote:
I have a KVM virtual machine running 2.6.33.4-95.fc13.x86_64 on a CentOS 5.5
host whose clock jumps about 8-12 hours a couple times a day. I have no idea
what is causing it. Fedora 12 and Centos 5.5 KVM machines run fine on the same
host. Is there any debugging I can enable to see what is jumping the clock?
kvm-clock: cpu 0, msr 0:1ba4741, boot clock
kvm-clock: cpu 0, msr 0:1e15741, primary cpu clock
Switching to clocksource kvm-clock
rtc_cmos 00:01: setting system clock to 2010-05-20 16:59:48 UTC (1274374788)
Thanks, though I don't think it made it there. I'm also not sure it's completely limited to KVM, though that is the only running system I am currently seeing the problem on. I also see clock jumps during anaconda installs on physical hardware and apparently they have been present since at least F11. Might be unrelated though.
I'm really at a loss of how to debug this though.
Do you have ntpd running inside the guest? I have a bug report lying around about 2.6.33 with kvm-clock jumping in time when ntpd is used: https://bugzilla.novell.com/show_bug.cgi?id=582260
Alex
That bug looks just like what I'm seeing. I even see the soft lockup messages
sometimes as well. May actually be seeing it with a Fedora 12 guest as well -
but it results in a hard hang.
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Orion Poplawski
Technical Manager 303-415-9701 x222
NWRA/CoRA Division FAX: 303-415-9702
3380 Mitchell Lane orion@xxxxxxxxxxxxx
Boulder, CO 80301 http://www.cora.nwra.com
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