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[Stéphane Graber <stgraber@xxxxxxxxxxxx>]

simplest reproduce for NM: ip link add dev test type bridge && ip link
set dev test up && ip addr add 1.2.3.4/24 dev test && sleep 2 &&
ifconfig test && ip link delete test

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https://bugs.launchpad.net/bugs/1512749

Title:
  lxcbr0 dissappears on Ubuntu 15.10

Status in lxc package in Ubuntu:
  Triaged
Status in network-manager package in Ubuntu:
  Triaged
Status in lxc source package in Wily:
  Triaged
Status in network-manager source package in Wily:
  Triaged
Status in lxc source package in Xenial:
  Triaged
Status in network-manager source package in Xenial:
  Triaged

Bug description:
  After initial upgrade from Ubuntu 15.04 to Ubuntu 15.10 LXC worked for
  a couple days then failed.   I found that the lxcbr0 interface no
  longer existed.

  I reported this on the lxc-user alias and about the same time several
  others had this happen to them also.

  Serge Hallyn requested I open a launchpad bug and post some info but
  before I could gather that info the system returned to normal (re
  lxcbr0 was back) the next day after the server was booted up again.

  note:   at least one other person had this happen to them also (lxcbr0
  came back by itself).

  Today, I booted this server again and ... again lxcbr0 was missing
  where it had been working last night.

  Below is all of the Info Serge Hallyn asked me to post.

  $ ifconfig lxcbr0
  lxcbr0: error fetching interface information: Device not found

  
  $ journalctl -u lxc-net
  -- Logs begin at Tue 2015-11-03 07:25:22 EST, end at Tue 2015-11-03 10:02:08 EST
  Nov 03 07:25:48 server3 systemd[1]: Starting LXC network bridge setup...
  Nov 03 07:25:50 server3 lxc-net[913]: dnsmasq: failed to create listening socket
  Nov 03 07:25:50 server3 lxc-net[913]: Failed to setup lxc-net.
  Nov 03 07:25:50 server3 systemd[1]: Started LXC network bridge setup.

  root@server3:/home/bmullan# /usr/lib/x86_64-linux-gnu/lxc/lxc-net stop         # note - execution just returns to command line
  root@server3:/home/bmullan#

  >> and lxcbr0 is still missing

  # ifconfig lxcbr0
  lxcbr0: error fetching interface information: Device not found

  root@server3:/home/bmullan# /usr/lib/x86_64-linux-gnu/lxc/lxc-net
  start

  dnsmasq: failed to create listening socket for 10.0.3.1: Cannot assign requested address
  Failed to setup lxc-net.
  root@server3:/home/bmullan#

  $ uname -a
  Linux server3 4.2.0-16-generic #19-Ubuntu SMP Thu Oct 8 15:35:06 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

  $ lsb_release -a
  No LSB modules are available.
  Distributor ID:    Ubuntu
  Description:    Ubuntu 15.10
  Release:    15.10
  Codename:    wily

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