Also, in dmesg:

[54545.873460] unregister_netdevice: waiting for lo to become free. Usage count 
= 1
[54556.103535] unregister_netdevice: waiting for lo to become free. Usage count 
= 1
[54566.333609] unregister_netdevice: waiting for lo to become free. Usage count 
= 1
[54576.563664] unregister_netdevice: waiting for lo to become free. Usage count 
= 1
[54586.793749] unregister_netdevice: waiting for lo to become free. Usage count 
= 1

I've modified my code to use lxc-stop as the cgroups do indeed leak
otherwise. What's strange is that it kept happening after clearing
cgroups, so perhaps it's something else.

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https://bugs.launchpad.net/bugs/1196295

Title:
  lxc-start enters uninterruptible sleep

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