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[Matt Riedemann <mriedem@xxxxxxxxxx>]

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

** Changed in: nova/liberty
     Assignee: (unassigned) => David Edery (david-edery)

** Changed in: nova/liberty
       Status: New => In Progress

** Changed in: nova
   Importance: Undecided => Medium

** Changed in: nova/liberty
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1522112

Title:
  ports duplication in the VM XML when using heat and multiple networks

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) liberty series:
  In Progress

Bug description:
  On latest devstack with the following (part of) local.conf:
  REGION_NAME=RegionOne
  Q_PLUGIN=ml2
  ENABLE_TENANT_VLANS=True
  ML2_VLAN_RANGES=RegionOne:2:4090

  disable_service n-net
  enable_service q-svc
  enable_service q-agt
  enable_service q-dhcp
  enable_service q-l3
  enable_service q-meta
  enable_service neutron
  enable_service h-eng h-api h-api-cfn h-api-cw

  
  After a successful stack.sh, run:
  neutron quota-update --network 100 --subnet 100 --port 100

  Run the following script to create networks:
  #!/bin/bash

  NET_NUM=20

  while [ $NET_NUM -gt 0 ]; do
      neutron net-create NET_${NET_NUM}
      neutron subnet-create --name 10.21.${NET_NUM}.0/24 --gateway 10.21.${NET_NUM}.1 NET_${NET_NUM} 10.21.${NET_NUM}.0/24
      NET_NUM=$[$NET_NUM-1]
  done

  Create an instance with 20 ports using the following HEAT template:
  heat_template_version: 2013-05-23

  description: >
      HOT template that just defines a single compute instance.
      Contains just base features.

  resources:
      ovs_port_1:
          type: OS::Neutron::Port
          properties:
              network: NET_1

      ovs_port_2:
          type: OS::Neutron::Port
          properties:
              network: NET_2

      ovs_port_3:
          type: OS::Neutron::Port
          properties:
              network: NET_3

      ovs_port_4:
          type: OS::Neutron::Port
          properties:
              network: NET_4

      ovs_port_5:
          type: OS::Neutron::Port
          properties:
              network: NET_5

      ovs_port_6:
          type: OS::Neutron::Port
          properties:
              network: NET_6

      ovs_port_7:
          type: OS::Neutron::Port
          properties:
              network: NET_7

      ovs_port_8:
          type: OS::Neutron::Port
          properties:
              network: NET_8

      ovs_port_9:
          type: OS::Neutron::Port
          properties:
              network: NET_9

      ovs_port_10:
          type: OS::Neutron::Port
          properties:
              network: NET_10

      ovs_port_11:
          type: OS::Neutron::Port
          properties:
              network: NET_11

      ovs_port_12:
          type: OS::Neutron::Port
          properties:
              network: NET_12

      ovs_port_13:
          type: OS::Neutron::Port
          properties:
              network: NET_13

      ovs_port_14:
          type: OS::Neutron::Port
          properties:
              network: NET_14

      ovs_port_15:
          type: OS::Neutron::Port
          properties:
              network: NET_15

      ovs_port_16:
          type: OS::Neutron::Port
          properties:
              network: NET_16

      ovs_port_17:
          type: OS::Neutron::Port
          properties:
              network: NET_17

      ovs_port_18:
          type: OS::Neutron::Port
          properties:
              network: NET_18

      ovs_port_19:
          type: OS::Neutron::Port
          properties:
              network: NET_19

      ovs_port_20:
          type: OS::Neutron::Port
          properties:
              network: NET_20

      ovs_instance:
          type: OS::Nova::Server
          properties:
              image: cirros-0.3.4-x86_64-uec
              flavor: m1.nano
              networks:
                  - port: { get_resource: ovs_port_1 }
                  - port: { get_resource: ovs_port_2 }
                  - port: { get_resource: ovs_port_3 }
                  - port: { get_resource: ovs_port_4 }
                  - port: { get_resource: ovs_port_5 }
                  - port: { get_resource: ovs_port_6 }
                  - port: { get_resource: ovs_port_7 }
                  - port: { get_resource: ovs_port_8 }
                  - port: { get_resource: ovs_port_9 }
                  - port: { get_resource: ovs_port_10 }
                  - port: { get_resource: ovs_port_11 }
                  - port: { get_resource: ovs_port_12 }
                  - port: { get_resource: ovs_port_13 }
                  - port: { get_resource: ovs_port_14 }
                  - port: { get_resource: ovs_port_15 }
                  - port: { get_resource: ovs_port_16 }
                  - port: { get_resource: ovs_port_17 }
                  - port: { get_resource: ovs_port_18 }
                  - port: { get_resource: ovs_port_19 }
                  - port: { get_resource: ovs_port_20 }

  The stack creation fails and nova conductor (n-cond) shows:
  2015-12-02 20:07:26.944 ERROR nova.scheduler.utils [req-9ddafa19-5281-4873-8d08-ecee6e6ad0f0 admin admin] [instance: a8c3f7a2-4298-45a6-81c1-3eea81541ca4] Error from last host: devstack-Box (node devstack-Box): [u'Traceback (most recent call last):\n', u'  File "/opt/stack/nova/nova/compute/manager.py", line 1902, in _do_build_and_run_instance\n    filter_properties)\n', u'  File "/opt/stack/nova/nova/compute/manager.py", line 2066, in _build_and_run_instance\n    instance_uuid=instance.uuid, reason=six.text_type(e))\n', u'RescheduledException: Build of instance a8c3f7a2-4298-45a6-81c1-3eea81541ca4 was re-scheduled: Unable to create tap device tap0739f4dd-d0: Device or resource busy\n']

  Looking at the generated VM XML file there are duplications of (some
  of) the ports which causes the above.

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