Open Stack

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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