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We had stability problems with both host and guest kernels when running
with 12.04. We found that upgrading the hosts to the backported 3.8 kernel
helped a lot with that. We also had problems specifically on guests with a
lot of resources (32 cores, 1T memory). Upgrading to a 3.11 kernel in the
guest (also a backport) resolved that issue.
 -nld


On Fri, Feb 7, 2014 at 10:02 PM, sylecn <sylecn at gmail.com> wrote:

> Hi,
>
> I have experienced "rcu_sched detected stalls on CPUs/tasks" in ubuntu
> vms, which result in dead vm that can't be rebooted/deleted, and I believe
> it's because of either bug in hypervisor kernel or guest kernel.
>
> I'd like to know which os version and kernel version do you use in
> production. Both public and private clouds are welcome. My company plans to
> run a small (to medium) private cloud. Hypervisor runs ubuntu 12.04 and the
> first guest OSes will be ubuntu 12.04 and CentOS 6. So kernel version for
> those is much appreciated.
>
> Is there a wiki page about this?
>
> PS. Here is a combination that have the above mentioned error:
>
>     hypervisor os: ubuntu 12.04.3
>     hypervisor kernel: 3.8.0-35-generic
>     vm os: ubuntu 12.04
>     vm kernel: 3.2.0-56-virtual
>     openstack: havana
>     libvirt: 1.1.1-0ubuntu8~cloud2
>
> Relevant old bugs on similar issues:
> rhel5.5 running as kvm guest hangs randomly
> https://bugzilla.redhat.com/show_bug.cgi?id=619798
>
> Bug #503138 "Lucid & Natty, KVM, After kernel message hrtimer: ..." : Bugs
> : "kvm" package : Ubuntu
> https://bugs.launchpad.net/ubuntu/+source/kvm/+bug/503138
>
> I don't have a 100% way to reproduce the problem, but it happens quite
> often, no matter when the vm is idle or loaded, which is not acceptable in
> production.
>
> Thanks,
> Yuanle
>
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> OpenStack-operators at lists.openstack.org
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>
>
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