Dave,
Working on this now. I tried a bisect between v3.12..v3.13 where it seemed that 
3.12 worked better, but it wasn't conclusive. I tried looking at dev_put 
dev_hold via systemtap, but that seems to modify the timing sufficiently. 
Looking at comments from Jordan Curzon to see if I can start instrumenting just 
those sections of the kernel to track down where we're failing to decrement the 
reference. I'm tracing the NETDEV_UNREGISTER notifier calls now to see if that 
leads to something conclusive.

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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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