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[Brian Haley <1844822@xxxxxxxxxxxxxxxxxx>]

msgpack is actually included as a requirement of oslo.privsep, with the
following requirement:

msgpack>=0.5.0 # Apache-2.0

>From the changelog at https://github.com/msgpack/msgpack-
python/blob/master/ChangeLog.rst it looks like max_bin_len was removed
in 0.6.1, so perhaps there needs to be a limit set the version.

Will re-assign to oslo.privsep for further investigation.

** Project changed: neutron => oslo.privsep

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https://bugs.launchpad.net/bugs/1844822

Title:
  linuxbridge agent crash after R ->S upgrade

Status in oslo.privsep:
  New

Bug description:
  After upgrading neutron from Rocky to Stein (openstack-ansible
  deployment on ubuntu 16) I ran into an issue where the linuxbridge
  agent would crash on startup:

  root@bctlpicrouter01:/var/log/neutron#
  /openstack/venvs/neutron-19.0.4.dev1/bin/neutron-linuxbridge-agent
  --config-file /etc/neutron/neutron.conf --config-file
  /etc/neutron/plugins/ml2/ml2_conf.ini --config-file
  /etc/neutron/plugins/ml2/linuxbridge_agent.ini

  Exception in thread privsep_reader:

  Traceback (most recent call last):
    File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner
      self.run()
    File "/usr/lib/python2.7/threading.py", line 754, in run
      self.__target(*self.__args, **self.__kwargs)
    File "/openstack/venvs/neutron-19.0.4.dev1/lib/python2.7/site-packages/oslo_privsep/comm.py", line 130, in _reader_main
      for msg in reader:
    File "/openstack/venvs/neutron-19.0.4.dev1/lib/python2.7/site-packages/six.py", line 564, in next
      return type(self).__next__(self)
    File "/openstack/venvs/neutron-19.0.4.dev1/lib/python2.7/site-packages/oslo_privsep/comm.py", line 77, in __next__
      return next(self.unpacker)
    File "msgpack/_unpacker.pyx", line 562, in msgpack._cmsgpack.Unpacker.__next__
    File "msgpack/_unpacker.pyx", line 493, in msgpack._cmsgpack.Unpacker._unpack
  ValueError: 1870054 exceeds max_bin_len(1048576)


  I was able to get around this problem by downgrading msgpack from
  0.6.1 to 0.5.6

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