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[Matt Riedemann <mriedem@xxxxxxxxxx>]

** Changed in: nova
    Milestone: newton-3 => None

** Changed in: oslo.privsep
       Status: New => Fix Released

** Changed in: oslo.privsep
     Assignee: (unassigned) => John Garbutt (johngarbutt)

** Changed in: oslo.privsep
   Importance: Undecided => High

** Also affects: nova/newton
   Importance: Undecided
       Status: New

** No longer affects: nova/newton

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https://bugs.launchpad.net/bugs/1616240

Title:
  Traceback in vif.py execv() arg 2 must contain only strings

Status in OpenStack Compute (nova):
  Invalid
Status in oslo.privsep:
  Fix Released

Bug description:
  While bringing up VM with the latest master (August 23,2016) I see
  this traceback and VM fails to launch.

  Complete log is here: http://paste.openstack.org/show/562688/
  nova.conf used is here: http://paste.openstack.org/show/562757/

  The issue is 100% reproducible in my testbed.

  2016-08-23 17:17:28.941 8808 ERROR nova.compute.manager [req-81060644-0dd7-453c-a68c-0d9cffe28fe7 3d1cd826f71a49cc81b33e85329f94b3 f738285a670c4be08d8a5e300aa25504 - - -] [instance: 95f11702-9e64-445d-a3cd-2cde074a4219] Instance failed to spawn
  2016-08-23 17:17:28.941 8808 ERROR nova.compute.manager [instance: 95f11702-9e64-445d-a3cd-2cde074a4219] Traceback (most recent call last):
  2016-08-23 17:17:28.941 8808 ERROR nova.compute.manager [instance: 95f11702-9e64-445d-a3cd-2cde074a4219]   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/compute/manager.py", line 2075, in _build_resources
  2016-08-23 17:17:28.941 8808 ERROR nova.compute.manager [instance: 95f11702-9e64-445d-a3cd-2cde074a4219]     yield resources
  2016-08-23 17:17:28.941 8808 ERROR nova.compute.manager [instance: 95f11702-9e64-445d-a3cd-2cde074a4219]   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/compute/manager.py", line 1919, in _build_and_run_instance
  2016-08-23 17:17:28.941 8808 ERROR nova.compute.manager [instance: 95f11702-9e64-445d-a3cd-2cde074a4219]     block_device_info=block_device_info)
  2016-08-23 17:17:28.941 8808 ERROR nova.compute.manager [instance: 95f11702-9e64-445d-a3cd-2cde074a4219]   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 2583, in spawn
  2016-08-23 17:17:28.941 8808 ERROR nova.compute.manager [instance: 95f11702-9e64-445d-a3cd-2cde074a4219]     post_xml_callback=gen_confdrive)
  2016-08-23 17:17:28.941 8808 ERROR nova.compute.manager [instance: 95f11702-9e64-445d-a3cd-2cde074a4219]   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 4803, in _create_domain_and_network
  2016-08-23 17:17:28.941 8808 ERROR nova.compute.manager [instance: 95f11702-9e64-445d-a3cd-2cde074a4219]     self.plug_vifs(instance, network_info)
  2016-08-23 17:17:28.941 8808 ERROR nova.compute.manager [instance: 95f11702-9e64-445d-a3cd-2cde074a4219]   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 684, in plug_vifs
  2016-08-23 17:17:28.941 8808 ERROR nova.compute.manager [instance: 95f11702-9e64-445d-a3cd-2cde074a4219]     self.vif_driver.plug(instance, vif)
  2016-08-23 17:17:28.941 8808 ERROR nova.compute.manager [instance: 95f11702-9e64-445d-a3cd-2cde074a4219]   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/virt/libvirt/vif.py", line 801, in plug
  2016-08-23 17:17:28.941 8808 ERROR nova.compute.manager [instance: 95f11702-9e64-445d-a3cd-2cde074a4219]     self._plug_os_vif(instance, vif_obj)
  2016-08-23 17:17:28.941 8808 ERROR nova.compute.manager [instance: 95f11702-9e64-445d-a3cd-2cde074a4219]   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/virt/libvirt/vif.py", line 783, in _plug_os_vif
  2016-08-23 17:17:28.941 8808 ERROR nova.compute.manager [instance: 95f11702-9e64-445d-a3cd-2cde074a4219]     raise exception.NovaException(msg)
  2016-08-23 17:17:28.941 8808 ERROR nova.compute.manager [instance: 95f11702-9e64-445d-a3cd-2cde074a4219] NovaException: Failure running os_vif plugin plug method: Failed to plug VIF VIFBridge(active=False,address=fa:16:3e:c0:4a:fd,bridge_name='qbrb7b522a4-3f',has_traffic_filtering=True,id=b7b522a4-3faa-42ca-8e0f-d8c241432e1f,network=Network(f32fdde6-bb99-4981-926b-a7df30f0a612),plugin='ovs',port_profile=VIFPortProfileBase,preserve_on_delete=True,vif_name='tapb7b522a4-3f'). Got error: execv() arg 2 must contain only strings
  2016-08-23 17:17:28.941 8808 ERROR nova.compute.manager [instance: 95f11702-9e64-445d-a3cd-2cde074a4219]

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