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[Bug 1337275] [NEW] fail to launch more than 12 instances after updating qouta with 'PortLimitExceeded: Maximum number of ports exceeded'

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Public bug reported:

I installed openstack with packstack as AIO + 3 computes. 
Trying to run 100 instances, we fail to launch more than 12 with 'PortLimitExceeded: Maximum number of ports exceeded' ERROR. 

to reproduce - launch 100 instances at once after changing admin tenant
project default quota.

attaching the answer file + logs but here is the ERROR from nova-
compute.log

2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8] Traceback (most recent call last):
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 1311, in _build_instance
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     set_access_ip=set_access_ip)
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 399, in decorated_function
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     return function(self, context, *args, **kwargs)
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 1723, in _spawn
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     LOG.exception(_('Instance failed to spawn'), instance=instance)
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/openstack/common/excutils.py", line 68, in __exit__
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     six.reraise(self.type_, self.value, self.tb)
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 1720, in _spawn
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     block_device_info)
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 2253, in spawn
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     admin_pass=admin_password)
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 2704, in _create_image
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     instance, network_info, admin_pass, files, suffix)
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 2522, in _inject_data
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     net = netutils.get_injected_network_template(network_info)
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/virt/netutils.py", line 71, in get_injected_network_template
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     if not (network_info and template):
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/network/model.py", line 420, in __len__
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     return self._sync_wrapper(fn, *args, **kwargs)
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/network/model.py", line 407, in _sync_wrapper
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     self.wait()
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/network/model.py", line 439, in wait
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     self[:] = self._gt.wait()
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/eventlet/greenthread.py", line 168, in wait
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     return self._exit_event.wait()
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/eventlet/event.py", line 120, in wait
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     current.throw(*self._exc)
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/eventlet/greenthread.py", line 194, in main
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     result = function(*args, **kwargs)
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 1510, in _allocate_network_async
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     dhcp_options=dhcp_options)
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/network/neutronv2/api.py", line 361, in allocate_for_instance
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     LOG.exception(msg, port_id)
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/openstack/common/excutils.py", line 68, in __exit__
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     six.reraise(self.type_, self.value, self.tb)
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/network/neutronv2/api.py", line 336, in allocate_for_instance
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     security_group_ids, available_macs, dhcp_opts)
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/network/neutronv2/api.py", line 192, in _create_port
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     raise exception.PortLimitExceeded()
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8] PortLimitExceeded: Maximum number of ports exceeded
2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8] 
2014-07-03 12:52:17.062 3045 DEBUG nova.compute.utils [req-fe69d609-e0a5-4f80-ad3c-d3958f274ff5 68e04b924e084a489984fdc63eb4157d 73df6022d9eb4158ac4d81f5d2fa6942] [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8] Build of instance bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8 was re-scheduled: Maximum number of ports exceeded notify_about_instance_usage /usr/lib/python2.7/site-packages/nova/compute/utils.py:336
2014-07-03 12:52:17.062 3045 TRACE nova.compute.utils [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8] Traceback (most recent call last):
2014-07-03 12:52:17.062 3045 TRACE nova.compute.utils [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 1191, in _run_instance
2014-07-03 12:52:17.062 3045 TRACE nova.compute.utils [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     instance, image_meta, legacy_bdm_in_spec)
2014-07-03 12:52:17.062 3045 TRACE nova.compute.utils [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 1361, in _build_instance
2014-07-03 12:52:17.062 3045 TRACE nova.compute.utils [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     reason=unicode(exc_info[1]))
2014-07-03 12:52:17.062 3045 TRACE nova.compute.utils [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8] RescheduledException: Build of instance bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8 was re-scheduled: Maximum number of ports exceeded
2014-07-03 12:52:17.062 3045 TRACE nova.compute.utils [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8] 
2014-07-03 12:52:17.065 3045 DEBUG nova.openstack.common.lockutils [req-fe69d609-e0a5-4f80-ad3c-d3958f274ff5 68e04b924e084a489984fdc63eb4157d 73df6022d9eb4158ac4d81f5d2fa6942] Semaphore / lock released "do_run_instance" inner /usr/lib/p:

** Affects: neutron
     Importance: Undecided
         Status: New

** Attachment added: "logs"
   https://bugs.launchpad.net/bugs/1337275/+attachment/4144560/+files/logs.tar.gz

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https://bugs.launchpad.net/bugs/1337275

Title:
  fail to launch more than 12 instances after updating qouta with
  'PortLimitExceeded: Maximum number of ports exceeded'

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  I installed openstack with packstack as AIO + 3 computes. 
  Trying to run 100 instances, we fail to launch more than 12 with 'PortLimitExceeded: Maximum number of ports exceeded' ERROR. 

  to reproduce - launch 100 instances at once after changing admin
  tenant project default quota.

  attaching the answer file + logs but here is the ERROR from nova-
  compute.log

  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8] Traceback (most recent call last):
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 1311, in _build_instance
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     set_access_ip=set_access_ip)
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 399, in decorated_function
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     return function(self, context, *args, **kwargs)
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 1723, in _spawn
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     LOG.exception(_('Instance failed to spawn'), instance=instance)
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/openstack/common/excutils.py", line 68, in __exit__
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     six.reraise(self.type_, self.value, self.tb)
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 1720, in _spawn
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     block_device_info)
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 2253, in spawn
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     admin_pass=admin_password)
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 2704, in _create_image
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     instance, network_info, admin_pass, files, suffix)
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 2522, in _inject_data
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     net = netutils.get_injected_network_template(network_info)
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/virt/netutils.py", line 71, in get_injected_network_template
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     if not (network_info and template):
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/network/model.py", line 420, in __len__
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     return self._sync_wrapper(fn, *args, **kwargs)
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/network/model.py", line 407, in _sync_wrapper
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     self.wait()
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/network/model.py", line 439, in wait
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     self[:] = self._gt.wait()
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/eventlet/greenthread.py", line 168, in wait
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     return self._exit_event.wait()
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/eventlet/event.py", line 120, in wait
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     current.throw(*self._exc)
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/eventlet/greenthread.py", line 194, in main
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     result = function(*args, **kwargs)
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 1510, in _allocate_network_async
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     dhcp_options=dhcp_options)
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/network/neutronv2/api.py", line 361, in allocate_for_instance
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     LOG.exception(msg, port_id)
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/openstack/common/excutils.py", line 68, in __exit__
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     six.reraise(self.type_, self.value, self.tb)
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/network/neutronv2/api.py", line 336, in allocate_for_instance
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     security_group_ids, available_macs, dhcp_opts)
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/network/neutronv2/api.py", line 192, in _create_port
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     raise exception.PortLimitExceeded()
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8] PortLimitExceeded: Maximum number of ports exceeded
  2014-07-03 12:52:17.061 3045 TRACE nova.compute.manager [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8] 
  2014-07-03 12:52:17.062 3045 DEBUG nova.compute.utils [req-fe69d609-e0a5-4f80-ad3c-d3958f274ff5 68e04b924e084a489984fdc63eb4157d 73df6022d9eb4158ac4d81f5d2fa6942] [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8] Build of instance bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8 was re-scheduled: Maximum number of ports exceeded notify_about_instance_usage /usr/lib/python2.7/site-packages/nova/compute/utils.py:336
  2014-07-03 12:52:17.062 3045 TRACE nova.compute.utils [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8] Traceback (most recent call last):
  2014-07-03 12:52:17.062 3045 TRACE nova.compute.utils [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 1191, in _run_instance
  2014-07-03 12:52:17.062 3045 TRACE nova.compute.utils [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     instance, image_meta, legacy_bdm_in_spec)
  2014-07-03 12:52:17.062 3045 TRACE nova.compute.utils [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 1361, in _build_instance
  2014-07-03 12:52:17.062 3045 TRACE nova.compute.utils [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8]     reason=unicode(exc_info[1]))
  2014-07-03 12:52:17.062 3045 TRACE nova.compute.utils [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8] RescheduledException: Build of instance bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8 was re-scheduled: Maximum number of ports exceeded
  2014-07-03 12:52:17.062 3045 TRACE nova.compute.utils [instance: bc4a3dcc-80a3-42ae-b2a1-8f4b852ce7f8] 
  2014-07-03 12:52:17.065 3045 DEBUG nova.openstack.common.lockutils [req-fe69d609-e0a5-4f80-ad3c-d3958f274ff5 68e04b924e084a489984fdc63eb4157d 73df6022d9eb4158ac4d81f5d2fa6942] Semaphore / lock released "do_run_instance" inner /usr/lib/p:

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