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[Sean Dague <sean@xxxxxxxxx>]

Not seen in the gate any more, the fixing patch is in merge conflict and
really old

** Changed in: nova
       Status: In Progress => Invalid

** Changed in: nova
     Assignee: Matt Riedemann (mriedem) => (unassigned)

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https://bugs.launchpad.net/bugs/1607714

Title:
  test_reassign_port_between_servers failing with tap device is busy
  errors in neutron xenial jobs since 7/28

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  Recent failures showing up in the tempest tests for
  'test_reassign_port_between_servers'.

  From n-cpu.log (http://logs.openstack.org/43/298443/3/check/gate-
  tempest-dsvm-neutron-full-ubuntu-
  xenial/5acdcca/logs/screen-n-cpu.txt.gz#_2016-07-29_07_25_47_948):

  
  2016-07-29 07:25:47.948 20203 ERROR nova.virt.libvirt.driver [req-572c16fd-696d-44ab-a633-49e6625b8f9c tempest-AttachInterfacesTestJSON-1497713114 tempest-AttachInterfacesTestJSON-1497713114] [instance: 73323063-7cc3-4645-9a68-662bf80d9e42] attaching network adapter failed.
  2016-07-29 07:25:47.948 20203 ERROR nova.virt.libvirt.driver [instance: 73323063-7cc3-4645-9a68-662bf80d9e42] Traceback (most recent call last):
  2016-07-29 07:25:47.948 20203 ERROR nova.virt.libvirt.driver [instance: 73323063-7cc3-4645-9a68-662bf80d9e42]   File "/opt/stack/new/nova/nova/virt/libvirt/driver.py", line 1389, in attach_interface
  2016-07-29 07:25:47.948 20203 ERROR nova.virt.libvirt.driver [instance: 73323063-7cc3-4645-9a68-662bf80d9e42]     guest.attach_device(cfg, persistent=True, live=live)
  2016-07-29 07:25:47.948 20203 ERROR nova.virt.libvirt.driver [instance: 73323063-7cc3-4645-9a68-662bf80d9e42]   File "/opt/stack/new/nova/nova/virt/libvirt/guest.py", line 295, in attach_device
  2016-07-29 07:25:47.948 20203 ERROR nova.virt.libvirt.driver [instance: 73323063-7cc3-4645-9a68-662bf80d9e42]     self._domain.attachDeviceFlags(device_xml, flags=flags)
  2016-07-29 07:25:47.948 20203 ERROR nova.virt.libvirt.driver [instance: 73323063-7cc3-4645-9a68-662bf80d9e42]   File "/usr/local/lib/python2.7/dist-packages/eventlet/tpool.py", line 186, in doit
  2016-07-29 07:25:47.948 20203 ERROR nova.virt.libvirt.driver [instance: 73323063-7cc3-4645-9a68-662bf80d9e42]     result = proxy_call(self._autowrap, f, *args, **kwargs)
  2016-07-29 07:25:47.948 20203 ERROR nova.virt.libvirt.driver [instance: 73323063-7cc3-4645-9a68-662bf80d9e42]   File "/usr/local/lib/python2.7/dist-packages/eventlet/tpool.py", line 144, in proxy_call
  2016-07-29 07:25:47.948 20203 ERROR nova.virt.libvirt.driver [instance: 73323063-7cc3-4645-9a68-662bf80d9e42]     rv = execute(f, *args, **kwargs)
  2016-07-29 07:25:47.948 20203 ERROR nova.virt.libvirt.driver [instance: 73323063-7cc3-4645-9a68-662bf80d9e42]   File "/usr/local/lib/python2.7/dist-packages/eventlet/tpool.py", line 125, in execute
  2016-07-29 07:25:47.948 20203 ERROR nova.virt.libvirt.driver [instance: 73323063-7cc3-4645-9a68-662bf80d9e42]     six.reraise(c, e, tb)
  2016-07-29 07:25:47.948 20203 ERROR nova.virt.libvirt.driver [instance: 73323063-7cc3-4645-9a68-662bf80d9e42]   File "/usr/local/lib/python2.7/dist-packages/eventlet/tpool.py", line 83, in tworker
  2016-07-29 07:25:47.948 20203 ERROR nova.virt.libvirt.driver [instance: 73323063-7cc3-4645-9a68-662bf80d9e42]     rv = meth(*args, **kwargs)
  2016-07-29 07:25:47.948 20203 ERROR nova.virt.libvirt.driver [instance: 73323063-7cc3-4645-9a68-662bf80d9e42]   File "/usr/local/lib/python2.7/dist-packages/libvirt.py", line 560, in attachDeviceFlags
  2016-07-29 07:25:47.948 20203 ERROR nova.virt.libvirt.driver [instance: 73323063-7cc3-4645-9a68-662bf80d9e42]     if ret == -1: raise libvirtError ('virDomainAttachDeviceFlags() failed', dom=self)
  2016-07-29 07:25:47.948 20203 ERROR nova.virt.libvirt.driver [instance: 73323063-7cc3-4645-9a68-662bf80d9e42] libvirtError: Unable to create tap device tap9dd515f0-ac: Device or resource busy
  2016-07-29 07:25:47.948 20203 ERROR nova.virt.libvirt.driver [instance: 73323063-7cc3-4645-9a68-662bf80d9e42]

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