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[Launchpad Bug Tracker <1512749@xxxxxxxxxxxxxxxxxx>]

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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

** Affects: network-manager (Ubuntu)
     Importance: Critical
         Status: Triaged

-- 
lxcbr0 dissappears on Ubuntu 15.10
https://bugs.launchpad.net/bugs/1512749
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