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[Cedric Brandily <1451576@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

_get_allocated_cidrs[1] locks only allocated subnets in a subnetpool
(with mysql/postgresql at least) which ensures we won't allocate a cidr
overlapping with existent cidrs but nothing disallows a concurrent
subnet allocation to create a subnet in the same subnetpool.

[1]:
https://github.com/openstack/neutron/blob/5962d825a6c98225c51bc6dd304b5c1ac89035etef/neutron/ipam/subnet_alloc.py#L40-L44

** Affects: neutron
     Importance: Undecided
     Assignee: Cedric Brandily (cbrandily)
         Status: New


** Tags: l3-ipam-dhcp

** Changed in: neutron
     Assignee: (unassigned) => Cedric Brandily (cbrandily)

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https://bugs.launchpad.net/bugs/1451576

Title:
  subnetpool allocation not ensuring non-overlapping cidrs

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  _get_allocated_cidrs[1] locks only allocated subnets in a subnetpool
  (with mysql/postgresql at least) which ensures we won't allocate a
  cidr overlapping with existent cidrs but nothing disallows a
  concurrent subnet allocation to create a subnet in the same
  subnetpool.

  [1]:
  https://github.com/openstack/neutron/blob/5962d825a6c98225c51bc6dd304b5c1ac89035etef/neutron/ipam/subnet_alloc.py#L40-L44

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