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[zhuyudong <2092983@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

When a network is deleted, the port is deleted first and then the subnet
is deleted. When a port is deleted, neutron-dhcp-agent is notified. The
agent code goes to self.schedule_resync("Agent port was deleted",
port.network_id), which causes sync_state to be performed on the
network. If the subnet is not deleted, sync_state may deactivate DHCP.
In this case, DHCP port creation and subnet deletion are performed at
the same time, triggering deadlock.

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2092983

Title:
  deadlock： delete the network

Status in neutron:
  New

Bug description:
  When a network is deleted, the port is deleted first and then the
  subnet is deleted. When a port is deleted, neutron-dhcp-agent is
  notified. The agent code goes to self.schedule_resync("Agent port was
  deleted", port.network_id), which causes sync_state to be performed on
  the network. If the subnet is not deleted, sync_state may deactivate
  DHCP. In this case, DHCP port creation and subnet deletion are
  performed at the same time, triggering deadlock.

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