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[Alan Pevec <1382064@xxxxxxxxxxxxxxxxxx>]

** Also affects: neutron/kilo
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1382064

Title:
  Failure to allocate tunnel id when creating networks concurrently

Status in neutron:
  Fix Released
Status in neutron kilo series:
  New

Bug description:
  When multiple networks are created concurrently, the following trace
  is observed:

  WARNING neutron.plugins.ml2.drivers.helpers [req-34103ce8-b6d0-459b-9707-a24e369cf9de None] Allocate gre segment from pool failed after 10 failed attempts
  DEBUG neutron.context [req-2995f877-e3e6-4b32-bdae-da6295e492a1 None] Arguments dropped when creating context: {u'project_name': None, u'tenant': None} __init__ /usr/lib/python2.7/dist-packages/neutron/context.py:83
  DEBUG neutron.plugins.ml2.drivers.helpers [req-3541998d-44df-468f-b65b-36504e893dfb None] Allocate gre segment from pool, attempt 1 failed with segment {'gre_id': 300L} allocate_partially_specified_segment /usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/helpers.py:138
  DEBUG neutron.context [req-6dcfb91d-2c5b-4e4f-9d81-55ba381ad232 None] Arguments dropped when creating context: {u'project_name': None, u'tenant': None} __init__ /usr/lib/python2.7/dist-packages/neutron/context.py:83
  ERROR neutron.api.v2.resource [req-34103ce8-b6d0-459b-9707-a24e369cf9de None] create failed
  TRACE neutron.api.v2.resource Traceback (most recent call last):
  TRACE neutron.api.v2.resource File "/usr/lib/python2.7/dist-packages/neutron/api/v2/resource.py", line 87, in resource
  TRACE neutron.api.v2.resource result = method(request=request, **args)
  TRACE neutron.api.v2.resource File "/usr/lib/python2.7/dist-packages/neutron/api/v2/base.py", line 448, in create
  TRACE neutron.api.v2.resource obj = obj_creator(request.context, **kwargs)
  TRACE neutron.api.v2.resource File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/plugin.py", line 497, in create_network
  TRACE neutron.api.v2.resource tenant_id)
  TRACE neutron.api.v2.resource File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/managers.py", line 160, in create_network_segments
  TRACE neutron.api.v2.resource segment = self.allocate_tenant_segment(session)
  TRACE neutron.api.v2.resource File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/managers.py", line 189, in allocate_tenant_segment
  TRACE neutron.api.v2.resource segment = driver.obj.allocate_tenant_segment(session)
  TRACE neutron.api.v2.resource File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/type_tunnel.py", line 115, in allocate_tenant_segment
  TRACE neutron.api.v2.resource alloc = self.allocate_partially_specified_segment(session)
  TRACE neutron.api.v2.resource File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/helpers.py", line 143, in allocate_partially_specified_segment
  TRACE neutron.api.v2.resource raise exc.NoNetworkFoundInMaximumAllowedAttempts()
  TRACE neutron.api.v2.resource NoNetworkFoundInMaximumAllowedAttempts: Unable to create the network. No available network found in maximum allowed attempts.
  TRACE neutron.api.v2.resource

  Additional conditions: multiserver deployment and mysql.

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