yahoo-eng-team team mailing list archive

[Slawek Kaplonski <1982367@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

During the evacuation of vm from the down compute node, it may happen
that when port will be DOWN, DHCP agent will update port and send info
to the neutron server before L2 (ovs) agent on the new compute node will
do it. Because of that when L2 agent will report port is UP on the node,
notification to nova will not be send as port status was already ACTIVE
(changed when DHCP agent sent it's info that port is configured).
Finally VM will end up in ERROR state as nova-compute will timeout while
waiting for the notification from neutron.

** Affects: neutron
     Importance: Undecided
     Assignee: Slawek Kaplonski (slaweq)
         Status: Confirmed

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https://bugs.launchpad.net/bugs/1982367

Title:
  Race condition between DHCP and L2 agent during evacuate vms may cause
  VM ends up in ERROR state

Status in neutron:
  Confirmed

Bug description:
  During the evacuation of vm from the down compute node, it may happen
  that when port will be DOWN, DHCP agent will update port and send info
  to the neutron server before L2 (ovs) agent on the new compute node
  will do it. Because of that when L2 agent will report port is UP on
  the node, notification to nova will not be send as port status was
  already ACTIVE (changed when DHCP agent sent it's info that port is
  configured). Finally VM will end up in ERROR state as nova-compute
  will timeout while waiting for the notification from neutron.

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