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[shihanzhang <shihanzhang@xxxxxxxxxx>]

Public bug reported:

I found that when a network has two subnet, vm can't get IP if I delete one subnet, you can reprodeuce this problem by the step:
1. create a new network
2. create subnetA in this network
3. create a port in subnetA
4. create subnetB in this network
5. delete subnetA 
6. create vm in subnetB, the vm can't get IP

I analyse the problem, the reason is that:
in my environment, the network id is 2914fe0b-721e-4738-b018-71ac4883e6f8, then you can see there are two TAP in the namespace qdhcp-2914fe0b-721e-4738-b018-71ac4883e6f8

root@ubuntu-242:/var/log/neutron# ip netns exec qdhcp-2914fe0b-721e-4738-b018-71ac4883e6f8 ip addr show
10: tapfd90aa02-d9: <BROADCAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN 
    link/ether fa:16:3e:6a:37:8f brd ff:ff:ff:ff:ff:ff
    inet 60.60.60.3/24 brd 60.60.60.255 scope global tapfd90aa02-d9
    inet 169.254.169.254/16 brd 169.254.255.255 scope global tapfd90aa02-d9
    inet 70.70.70.2/24 brd 70.70.70.255 scope global tapfd90aa02-d9
    inet6 fe80::f816:3eff:fe6a:378f/64 scope link 
       valid_lft forever preferred_lft forever
15: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
37: tapbed116e5-4f: <BROADCAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN 
    link/ether fa:16:3e:96:c7:ec brd ff:ff:ff:ff:ff:ff
    inet 70.70.70.2/24 brd 70.70.70.255 scope global tapbed116e5-4f
    inet 169.254.169.254/16 brd 169.254.255.255 scope global tapbed116e5-4f
    inet6 fe80::f816:3eff:fe96:c7ec/64 scope link 
       valid_lft forever preferred_lft forever
you can see that the ip: 70.70.70.2 is set on two tap

** Affects: neutron
     Importance: Undecided
     Assignee: shihanzhang (shihanzhang)
         Status: New

** Changed in: neutron
     Assignee: (unassigned) => shihanzhang (shihanzhang)

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https://bugs.launchpad.net/bugs/1278674

Title:
  Vm doesn't get IP due to deleting another subnet

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  I found that when a network has two subnet, vm can't get IP if I delete one subnet, you can reprodeuce this problem by the step:
  1. create a new network
  2. create subnetA in this network
  3. create a port in subnetA
  4. create subnetB in this network
  5. delete subnetA 
  6. create vm in subnetB, the vm can't get IP

  I analyse the problem, the reason is that:
  in my environment, the network id is 2914fe0b-721e-4738-b018-71ac4883e6f8, then you can see there are two TAP in the namespace qdhcp-2914fe0b-721e-4738-b018-71ac4883e6f8

  root@ubuntu-242:/var/log/neutron# ip netns exec qdhcp-2914fe0b-721e-4738-b018-71ac4883e6f8 ip addr show
  10: tapfd90aa02-d9: <BROADCAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN 
      link/ether fa:16:3e:6a:37:8f brd ff:ff:ff:ff:ff:ff
      inet 60.60.60.3/24 brd 60.60.60.255 scope global tapfd90aa02-d9
      inet 169.254.169.254/16 brd 169.254.255.255 scope global tapfd90aa02-d9
      inet 70.70.70.2/24 brd 70.70.70.255 scope global tapfd90aa02-d9
      inet6 fe80::f816:3eff:fe6a:378f/64 scope link 
         valid_lft forever preferred_lft forever
  15: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 
      link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
      inet 127.0.0.1/8 scope host lo
      inet6 ::1/128 scope host 
         valid_lft forever preferred_lft forever
  37: tapbed116e5-4f: <BROADCAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN 
      link/ether fa:16:3e:96:c7:ec brd ff:ff:ff:ff:ff:ff
      inet 70.70.70.2/24 brd 70.70.70.255 scope global tapbed116e5-4f
      inet 169.254.169.254/16 brd 169.254.255.255 scope global tapbed116e5-4f
      inet6 fe80::f816:3eff:fe96:c7ec/64 scope link 
         valid_lft forever preferred_lft forever
  you can see that the ip: 70.70.70.2 is set on two tap

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