[Bug 1518430] Re: liberty: ~busy loop on epoll_wait being called with zero timeout

[Corey Bryant]

This has been uploaded to ubuntu zesty, yakkety, xenial and is awaiting
sru team review for yakkety and xenial.  This has also been uploaded to
kilo-staging and liberty-staging for the ubuntu cloud archive.  These
should all be available in -proposed soon for testing.

** Also affects: cloud-archive/kilo
   Importance: Undecided
       Status: New

** Changed in: cloud-archive/kilo
       Status: New => Fix Committed

** Changed in: cloud-archive/liberty
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1518430

Title:
  liberty: ~busy loop on epoll_wait being called with zero timeout

Status in Ubuntu Cloud Archive:
  Fix Committed
Status in Ubuntu Cloud Archive kilo series:
  Fix Committed
Status in Ubuntu Cloud Archive liberty series:
  Fix Committed
Status in Ubuntu Cloud Archive mitaka series:
  Fix Committed
Status in Ubuntu Cloud Archive newton series:
  Fix Committed
Status in OpenStack Compute (nova):
  Invalid
Status in oslo.messaging:
  Fix Released
Status in nova package in Ubuntu:
  Invalid
Status in python-oslo.messaging package in Ubuntu:
  Fix Released
Status in python-oslo.messaging source package in Xenial:
  New
Status in python-oslo.messaging source package in Yakkety:
  New
Status in python-oslo.messaging source package in Zesty:
  Fix Released

Bug description:
  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

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