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[Rodolfo Alonso <1976292@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Reference bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2089420

During the
``neutron.plugins.ml2.drivers.ovn.agent.neutron_agent.AgentCache.__iter__``
iteration, an event to add or deleted an OVN agent can happen. The
dictionary ``AgentCache.agents`` can change and trigger the error
reported in the snippet.

Snippet: https://paste.opendev.org/show/bWn8eKHKIjsWb4MM6pd2/

** Affects: neutron
     Importance: Medium
     Assignee: Rodolfo Alonso (rodolfo-alonso-hernandez)
         Status: Confirmed

** Changed in: neutron
   Importance: Undecided => Critical

** Changed in: neutron
   Importance: Critical => Medium

** Changed in: neutron
     Assignee: (unassigned) => Rodolfo Alonso (rodolfo-alonso-hernandez)

** Changed in: neutron
       Status: New => Incomplete

** Changed in: neutron
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1976292

Title:
  [OVN] AgentCache.agents can change during an iteration operation

Status in neutron:
  Confirmed

Bug description:
  Reference bugzilla:
  https://bugzilla.redhat.com/show_bug.cgi?id=2089420

  During the
  ``neutron.plugins.ml2.drivers.ovn.agent.neutron_agent.AgentCache.__iter__``
  iteration, an event to add or deleted an OVN agent can happen. The
  dictionary ``AgentCache.agents`` can change and trigger the error
  reported in the snippet.

  Snippet: https://paste.opendev.org/show/bWn8eKHKIjsWb4MM6pd2/

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