Public bug reported:

libvirtd cannot properly configure the default bridge device when
installed inside of unprivileged LXD containers. 'systemctl status
libvirtd' shows the following error:

  error : virNetDevBridgeSet:140 : Unable to set bridge virbr0
forward_delay: Permission denied

This is caused due to the files under /sys/class/net/ being owned by
init namespace root rather than container root even when the bridge
device is created inside of the container. Here's an example from inside
of an unprivileged container:

# brctl addbr testbr0
# ls -al /sys/class/net/testbr0/bridge/forward_delay 
-rw-r--r-- 1 nobody nogroup 4096 Jul 30 22:33 
/sys/class/net/testbr0/bridge/forward_delay

libvirt cannot open this file for writing even though it created the
device. Where safe, files under /sys/class/net/ should be owned by
container root.

The following upstream patches have been merged into linux-next which
fix this bug:

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=c59e18b876da3e466abe5fa066aa69050f5be17c
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=d1753390274f7760e5b593cb657ea34f0617e559

** Affects: linux (Ubuntu)
     Importance: Medium
     Assignee: Tyler Hicks (tyhicks)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1784501

Title:
  libvirtd is unable to configure bridge devices inside of LXD
  containers

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