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[Launchpad Bug Tracker <1431958@xxxxxxxxxxxxxxxxxx>]

[Expired for neutron because there has been no activity for 60 days.]

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

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https://bugs.launchpad.net/bugs/1431958

Title:
  Missing ovs flows results in vm isolation for particular tenants

Status in OpenStack Neutron (virtual network service):
  Expired

Bug description:
  For some reason, some compute nodes are missing ovs flows of various
  tenants (not all of them), resulting in vm isolation (no dhcp/metadata
  on boot). A particular tenant "A" might have issues with node "B"
  whilst tenant "B" might have problems with node "A" and not "B". All
  of the affected tenant VMs running in an affected node are isolated.

  In those compute nodes, the ovs-vswitchd process has crashed previously:
  ubuntu@niagara:~$ ps -ef | grep vswitchd
  root      1959     1  0 Feb12 ?        00:41:15 ovs-vswitchd: monitoring pid 62005 (4 crashes: pid 59408 died, killed (Segmentation fault), core dumped)

  After restarting the openvswitch-switch service, ps shows that the missing flows are being created by neutron (e.g. sudo neutron-rootwrap /etc/neutron/rootwrap.conf ovs-ofctl mod-flows br-tun table=21,dl_vlan=11,actions=strip_vlan,set_tunnel:4,output:5,6,2,4,7,3).
  --- 
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  DistroRelease: Ubuntu 14.04
  Package: neutron-common 1:2014.1.3-0ubuntu1
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: User Name 3.13.0-45.74-generic 3.13.11-ckt13
  Tags:  trusty uec-images
  Uname: Linux 3.13.0-45-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm audio cdrom dialout dip floppy libvirtd netdev plugdev sudo video
  _MarkForUpload: True
  modified.conffile..etc.neutron.api.paste.ini: [deleted]
  modified.conffile..etc.neutron.fwaas.driver.ini: [deleted]
  modified.conffile..etc.neutron.l3.agent.ini: [deleted]
  modified.conffile..etc.neutron.neutron.conf: [deleted]
  modified.conffile..etc.neutron.policy.json: [deleted]
  modified.conffile..etc.neutron.rootwrap.conf: [deleted]
  modified.conffile..etc.neutron.rootwrap.d.debug.filters: [deleted]
  modified.conffile..etc.neutron.rootwrap.d.iptables.firewall.filters: [deleted]
  modified.conffile..etc.neutron.rootwrap.d.l3.filters: [deleted]
  modified.conffile..etc.neutron.rootwrap.d.vpnaas.filters: [deleted]
  modified.conffile..etc.neutron.vpn.agent.ini: [deleted]
  modified.conffile..etc.sudoers.d.neutron.sudoers: [deleted]

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