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[Launchpad Bug Tracker <1518430@xxxxxxxxxxxxxxxxxx>]

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Context: openstack juju/maas deploy using 1510 charms release
on trusty, with:
  openstack-origin: "cloud:trusty-liberty"
  source: "cloud:trusty-updates/liberty

* Several openstack nova- and neutron- services, at least:
nova-compute, neutron-server, nova-conductor,
neutron-openvswitch-agent,neutron-vpn-agent
show almost busy looping on epoll_wait() calls, with zero timeout set
most frequently.
- nova-compute (chose it b/cos single proc'd) strace and ltrace captures:
  http://paste.ubuntu.com/13371248/ (ltrace, strace)

As comparison, this is how it looks on a kilo deploy:
- http://paste.ubuntu.com/13371635/

* 'top' sample from a nova-cloud-controller unit from
   this completely idle stack:
  http://paste.ubuntu.com/13371809/

FYI *not* seeing this behavior on keystone, glance, cinder,
ceilometer-api.

As this issue is present on several components, it likely comes
from common libraries (oslo concurrency?), fyi filed the bug to
nova itself as a starting point for debugging.

Note: The description in the following bug gives a good overview of the
issue and points to a possible fix for oslo.messaging:
https://bugs.launchpad.net/mos/+bug/1380220

** Affects: cloud-archive
     Importance: Undecided
         Status: Fix Committed

** Affects: cloud-archive/kilo
     Importance: Undecided
         Status: Fix Committed

** Affects: cloud-archive/liberty
     Importance: Undecided
         Status: Fix Committed

** Affects: cloud-archive/mitaka
     Importance: Undecided
         Status: Fix Committed

** Affects: cloud-archive/newton
     Importance: Undecided
         Status: Fix Committed

** Affects: ubuntu-translations
     Importance: Undecided
         Status: Invalid

** Affects: oslo.messaging
     Importance: Undecided
     Assignee: John Eckersberg (jeckersb)
         Status: Fix Released

** Affects: nova (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Affects: python-oslo.messaging (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: python-oslo.messaging (Ubuntu Xenial)
     Importance: Undecided
         Status: New

** Affects: python-oslo.messaging (Ubuntu Yakkety)
     Importance: Undecided
         Status: New

** Affects: python-oslo.messaging (Ubuntu Zesty)
     Importance: Undecided
         Status: Fix Released


** Tags: canonical-bootstack verification-liberty-needed
-- 
liberty: ~busy loop on epoll_wait being called with zero timeout
https://bugs.launchpad.net/bugs/1518430
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