[Openstack-operators] well tested distro/kernel combination for production

Narayan Desai narayan.desai at gmail.com
Sun Feb 9 03:31:05 UTC 2014

Host or guest?

On Sat, Feb 8, 2014 at 6:40 PM, George Shuklin <george.shuklin at gmail.com>wrote:

> Can't say which kernel is stable, but just yesterday I've got rather
> unfunny error on my lab stand with 3.8.0-35-generic (x86_64): vim went to
> IO and did not come back (in D+ state). Disk was fine, other software was
> fine, but in_flight time was 100% for disk and kernel starts to report
> 'stall' about hanged vim. I played around some time, but none of tricks was
> not able to 'free' vim (not the disk reinitialization, not the pci bus
> rescan).
> In my case that happens after rather brutal test of 'snapshot creating
> during 32 concurrent read/write operations from instance'.
> On 08.02.2014 06:02, sylecn 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.
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