Open Stack

We hit the same issue a while back (I suspect), which we seemed to resolve
by pinning QEMU and related packages at the following version (you might
need to hunt down the debs manually):

1:2.5+dfsg-5ubuntu10.5

I'm certain there's a launchpad bug for Ubuntu qemu regarding this, but
don't have it to hand.

Hope this helps,
Chris

On Thu, 23 Nov 2017 at 15:33 Joe Topjian <joe at topjian.net> wrote:

> Hi all,
>
> We're seeing some strange libvirt issues in an Ubuntu 16.04 environment.
> It's running Mitaka, but I don't think this is a problem with OpenStack
> itself.
>
> We're in the process of upgrading this environment from Ubuntu 14.04 with
> the Mitaka cloud archive to 16.04. Instances are being live migrated (NFS
> share) to a new 16.04 compute node (fresh install), so there's a change
> between libvirt versions (1.2.2 to 1.3.1). The problem we're seeing is only
> happening on the 16.04/1.3.1 nodes.
>
> We're getting occasional reports of instances not able to be snapshotted.
> Upon investigation, the snapshot process quits early with a libvirt/qemu
> lock timeout error. We then see that the instance's xml file has
> disappeared from /etc/libvirt/qemu and must restart libvirt and hard-reboot
> the instance to get things back to a normal state. Trying to live-migrate
> the instance to another node causes the same thing to happen.
>
> However, at some random time, either the snapshot or the migration will
> work without error. I haven't been able to reproduce this issue on my own
> and haven't been able to figure out the root cause by inspecting instances
> reported to me.
>
> One thing that has stood out is the length of time it takes for libvirt to
> start. If I run "/etc/init.d/libvirt-bin start", it takes at least 5
> minutes before a simple "virsh list" will work. The command will hang
> otherwise. If I increase libvirt's logging level, I can see that during
> this period of time, libvirt is working on iptables and ebtables (looks
> like it's shelling out commands).
>
> But if I run "libvirtd -l" straight on the command line, all of this
> completes within 5 seconds (including all of the shelling out).
>
> My initial thought is that systemd is doing some type of throttling
> between the system and user slice, but I've tried comparing slice
> attributes and, probably due to my lack of understanding of systemd, can't
> find anything to prove this.
>
> Is anyone else running into this problem? Does anyone know what might be
> the cause?
>
> Thanks,
> Joe
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