So far I haven't been able to reproduce this with 3.13.0-49, nor
3.13.0-37.

My setup is as follows:
Two vms, one with nfs-server and another for reproducer.

nfs-server setup with these commands:
  apt-get install nfs-kernel-server
  mkdir /export
  chown 777 /export
  echo "/export *(rw,no_root_squash,fsid=0,no_subtree_check)" > /etc/exports
  service nfs-kernel-server restart

Reproducer VM has LXC container that is bridged to the libvirt bridge.
  apt-get update
  apt-get install lxc
  lxc-create -t download -n base -- -d ubuntu -r trusty -a amd64
Then edit /var/lib/lxc/base/config to use:
  lxc.aa_profile = unconfined
  lxc.network.link = br0

Then run:
 sudo ./reproducer.py 5 10 192.168.122.241:/export

I tried running this many times with no luck. Any other variables I need
to consider?

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https://bugs.launchpad.net/bugs/1403152

Title:
  unregister_netdevice: waiting for lo to become free. Usage count

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