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[Li Ma <skywalker.nick@xxxxxxxxx>]

The related fix has merged.

https://review.openstack.org/#/c/126914/5

** Changed in: neutron
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/1298803

Title:
  rpc worker makes neutron-server crash

Status in OpenStack Neutron (virtual network service):
  Invalid

Bug description:
  After upgrading from icehouse b2 to b3, neutron-server using zmq was
  crashed silently. No core dump, no exception, no error, no warnings.
  After I switched to rabbitmq, everything went well. It really drove me
  crazy.

  Then I tried to debug, it was really hard to do it, because there were
  no useful messages provided.

  Then I compared source codes between b2 and b3, and finally I found
  out the main difference between the two versions are that b3 enables a
  new rpc_worker mechanism.

  I removed all the related code back to the way b2 goes.

  Then the problem is immediately solved.

  I just guess that rpc_worker uses greenpool which has conflicts with
  the thread pool from zeromq. I suggest to claim in neutron.conf that
  it is incompatible with zeromq, and when rpc_worker == 0, just disable
  it.

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