yahoo-eng-team team mailing list archive

[Armando Migliaccio <1624701@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Change [1] has triggered an issue with the DHCP agent. This can be
reproduced as below:

- A subnet gets deleted
- A dhcp port is deleted
- A notification is sent to the agent
- DHCP agent deletes the port from OVS without killing dnsmasq first
- dnsmasq is holding a file handle to the interface still
- To this many times
- OVS goes nuts with [2], where traces 'added interface tap%% on port ##' happens a gazillion time pointing to the same OVS and of port.

[1] https://review.openstack.org/#/c/355117/
[2] http://logs.openstack.org/74/370974/2/check/gate-tempest-dsvm-neutron-dvr-ubuntu-xenial/4d01980/logs/openvswitch/ovs-vswitchd.txt.gz

** Affects: neutron
     Importance: High
     Assignee: Kevin Benton (kevinbenton)
         Status: Confirmed


** Tags: l3-ipam-dhcp newton-rc-potential

** Changed in: neutron
    Milestone: None => newton-rc2

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

** Tags added: l3-ipam-dhcp

** Tags added: newton-rc-potential

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

** Changed in: neutron
     Assignee: (unassigned) => Kevin Benton (kevinbenton)

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https://bugs.launchpad.net/bugs/1624701

Title:
  OVS port pulled from under dnsmasq

Status in neutron:
  Confirmed

Bug description:
  Change [1] has triggered an issue with the DHCP agent. This can be
  reproduced as below:

  - A subnet gets deleted
  - A dhcp port is deleted
  - A notification is sent to the agent
  - DHCP agent deletes the port from OVS without killing dnsmasq first
  - dnsmasq is holding a file handle to the interface still
  - To this many times
  - OVS goes nuts with [2], where traces 'added interface tap%% on port ##' happens a gazillion time pointing to the same OVS and of port.

  [1] https://review.openstack.org/#/c/355117/
  [2] http://logs.openstack.org/74/370974/2/check/gate-tempest-dsvm-neutron-dvr-ubuntu-xenial/4d01980/logs/openvswitch/ovs-vswitchd.txt.gz

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