Great progress, thanks Chris.  I did some initial instrumentation of
dev_put and dev_hold calls earlier, dumping out the call stack and
comparing a good run to a bad one.  Nothing definitive yet, and it's bit
tricky to match up on an SMP machine, but one thing stood out: many of
the bad traces had UDP in the mix (for example, calls to
__udp4_lib_mcast_deliver and __udp4_lib_rcv).  Maybe useful information,
maybe not.

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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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