[Bug 490072] Re: KVM VMs loses their CPU (kvm84 backport/hardy)

Yann Hamon yann at mandragor.org
Tue Dec 29 14:36:43 GMT 2009

Hello soren, about this bug: I found out after a while that it was happening only on my 64 bits hosts.
What happened is that inadvertently I installed ubuntu 32 bits on VMs with a 64bits CPU.  I never noticed this on kvm62 as it was running fine. However when I upgraded to the backports all the VMs from the host regularly crashed, with 10 VMs I used to have at least one VM hanging a day.

When i found out this bitness issue, I moved all the VMs back to 32
bits. It seems to run fine now, haven't had a single crash since then.
Haven't tried 64bits guests on 64bits VMs. Not sure if it's worth fixing
- as the workaround seems ok, and it might affect only 32 bits OSes on
64bits CPUs, which I admit is a weird thing to do with VMs. If there is
a "known issues" list somewhere, it would be worth adding it there
though :)

Thanks for your time

KVM VMs loses their CPU (kvm84 backport/hardy)
You received this bug notification because you are a member of Ubuntu
Server Team, which is subscribed to kvm in ubuntu.

More information about the Ubuntu-server-bugs mailing list