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[Harald Jensås <hjensas@xxxxxxxxxx>]

Public bug reported:

A provider network with 3 stateless subnet, on different segments.
(NOTE, this output is from a dev environment with WIP fixes for bug/1864333 and bug/1864333)

$ for subnet in $(openstack subnet list --network providernet -f value -c ID); do openstack subnet show $subnet -f yaml -c segment_id -c cidr -c id; done
cidr: deaf:beef:3::/64
id: 954a1b8c-5fe7-4dcc-84bd-df24c371e651
segment_id: 632b2bab-5402-4a4d-9433-783d7051d8aa
cidr: deaf:beef:1::/64
id: ebae0025-a701-4b22-aa66-00ec48025b30
segment_id: d1930254-36c9-4490-94f7-d095a25cf3b0
cidr: deaf:beef:2::/64
id: ec2a9675-a286-4c8b-983d-2f762939cb5b
segment_id: 1586a525-e250-4003-bae4-819e18e70c0e

$ openstack port list --network providernet -f yaml -c "Fixed IP Addresses"
- Fixed IP Addresses:
  - ip_address: deaf:beef:2:0:f816:3eff:fe03:eb71
    subnet_id: ec2a9675-a286-4c8b-983d-2f762939cb5b
- Fixed IP Addresses:
  - ip_address: deaf:beef:3:0:f816:3eff:fe48:bb26
    subnet_id: c052289a-f8a0-464b-9413-717628fca4c2
- Fixed IP Addresses:
  - ip_address: deaf:beef:1:0:f816:3eff:fea1:1aab
    subnet_id: ebae0025-a701-4b22-aa66-00ec48025b30
- Fixed IP Addresses: []  <-- Deffered allocation

$ openstack subnet delete subnet3

After deleting subnet3, the port who was on this subnet get's an
allocation on  subnet_id: ebae0025-a701-4b22-aa66-00ec48025b30 which is
not the correct segment for this host.

$ openstack port list --network providernet -f yaml -c "Fixed IP Addresses"
- Fixed IP Addresses:
  - ip_address: deaf:beef:2:0:f816:3eff:fe03:eb71
    subnet_id: ec2a9675-a286-4c8b-983d-2f762939cb5b
- Fixed IP Addresses:
  - ip_address: deaf:beef:1:0:f816:3eff:fe48:bb26   <-- Allocation on invalid segment.
    subnet_id: ebae0025-a701-4b22-aa66-00ec48025b30
- Fixed IP Addresses:
  - ip_address: deaf:beef:1:0:f816:3eff:fea1:1aab
    subnet_id: ebae0025-a701-4b22-aa66-00ec48025b30
- Fixed IP Addresses: []


I belive the correct behaviour here would be to remove the allocation from the deleted segment and set allocaton 'deferred' on the port. Or raise SubnetInUse exception on subnet delete because there is no other auto-address subnet that can satisfy the in-use port.

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: ipv6

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https://bugs.launchpad.net/bugs/1865138

Title:
  When deleting an stateless subnet port can get allocation on subnet
  with invalid segment

Status in neutron:
  New

Bug description:
  A provider network with 3 stateless subnet, on different segments.
  (NOTE, this output is from a dev environment with WIP fixes for bug/1864333 and bug/1864333)

  $ for subnet in $(openstack subnet list --network providernet -f value -c ID); do openstack subnet show $subnet -f yaml -c segment_id -c cidr -c id; done
  cidr: deaf:beef:3::/64
  id: 954a1b8c-5fe7-4dcc-84bd-df24c371e651
  segment_id: 632b2bab-5402-4a4d-9433-783d7051d8aa
  cidr: deaf:beef:1::/64
  id: ebae0025-a701-4b22-aa66-00ec48025b30
  segment_id: d1930254-36c9-4490-94f7-d095a25cf3b0
  cidr: deaf:beef:2::/64
  id: ec2a9675-a286-4c8b-983d-2f762939cb5b
  segment_id: 1586a525-e250-4003-bae4-819e18e70c0e

  $ openstack port list --network providernet -f yaml -c "Fixed IP Addresses"
  - Fixed IP Addresses:
    - ip_address: deaf:beef:2:0:f816:3eff:fe03:eb71
      subnet_id: ec2a9675-a286-4c8b-983d-2f762939cb5b
  - Fixed IP Addresses:
    - ip_address: deaf:beef:3:0:f816:3eff:fe48:bb26
      subnet_id: c052289a-f8a0-464b-9413-717628fca4c2
  - Fixed IP Addresses:
    - ip_address: deaf:beef:1:0:f816:3eff:fea1:1aab
      subnet_id: ebae0025-a701-4b22-aa66-00ec48025b30
  - Fixed IP Addresses: []  <-- Deffered allocation

  $ openstack subnet delete subnet3

  After deleting subnet3, the port who was on this subnet get's an
  allocation on  subnet_id: ebae0025-a701-4b22-aa66-00ec48025b30 which
  is not the correct segment for this host.

  $ openstack port list --network providernet -f yaml -c "Fixed IP Addresses"
  - Fixed IP Addresses:
    - ip_address: deaf:beef:2:0:f816:3eff:fe03:eb71
      subnet_id: ec2a9675-a286-4c8b-983d-2f762939cb5b
  - Fixed IP Addresses:
    - ip_address: deaf:beef:1:0:f816:3eff:fe48:bb26   <-- Allocation on invalid segment.
      subnet_id: ebae0025-a701-4b22-aa66-00ec48025b30
  - Fixed IP Addresses:
    - ip_address: deaf:beef:1:0:f816:3eff:fea1:1aab
      subnet_id: ebae0025-a701-4b22-aa66-00ec48025b30
  - Fixed IP Addresses: []

  
  I belive the correct behaviour here would be to remove the allocation from the deleted segment and set allocaton 'deferred' on the port. Or raise SubnetInUse exception on subnet delete because there is no other auto-address subnet that can satisfy the in-use port.

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