[openstack-dev] Gate Status - Friday Edition
chrisw at sous-sol.org
Sat Jan 25 01:08:25 UTC 2014
* Salvatore Orlando (sorlando at nicira.com) wrote:
> I've found out that several jobs are exhibiting failures like bug 1254890
>  and bug 1253896  because openvswitch seem to be crashing the kernel.
> The kernel trace reports as offending process usually either
> neutron-ns-metadata-proxy or dnsmasq, but  seem to clearly point to
Hmm, that actually shows dnsmasq is the running/exiting process.
The ovs-vsctl was run nearly a half-second earlier. Looks like
ovs-vsctl successfuly added the tap device (assuming it's for
dnsmasq?). And dnsmasq is exiting upon receiving a signal. Shot in
the dark, has the neutron path that would end up killing dnsmasq
(Dnsmasq::reload_allocations()) changed recently? I didn't see much.
> 254 events observed in the previous 6 days show a similar trace in the logs
That kernel (3.2.0) is over a year old. And there have been some network
namespace fixes since then (IIRC, refcounting related).
> This means that while this alone won't explain all the failures observed,
> it is however potentially one of the prominent root causes.
> >From the logs I have little hints about the kernel running. It seems there
> has been no update in the past 7 days, but I can't be sure.
> Openvswitch builds are updated periodically. The last build I found not to
> trigger failures was the one generated on 2014/01/16 at 01:58:18.
> Unfortunately version-wise I always have only 1.4.0, no build number.
> I don't know if this will require getting in touch with ubuntu, or if we
> can just prep a different image which an OVS build known to work without
>  https://bugs.launchpad.net/neutron/+bug/1254890
>  https://bugs.launchpad.net/neutron/+bug/1253896
>  http://paste.openstack.org/show/61869/
>  "kernel BUG at /build/buildd/linux-3.2.0/fs/buffer.c:2917" and
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