Comment 6 for bug 1786168

Those extra MPs only exist in LXD containers, but other solutions might have other sub /dev/* MPs.
Newer libvirt tries to preserve these into the qemu namespace, which is what breaks it now.

But when resolving the LXD specials I found that others are hit just as much.
E.g. mount:
  devpts on /dev/console type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
triggers:
  profile="/usr/sbin/libvirtd" name="/run/libvirt/qemu/1-kvmguest-cosmic-norm.console" srcname="/dev/console" flags="rw, move"

Essentially any mounts under /dev would have to be covered, we don't want to have a LXD only solution that tomorrow breaks on any other container and/or different LXD setup.

Also hit /dev/net/tun, ... this is not LXD only at all