Could you please run apport-collect 1179509 from the system after this
happens?

This sounds like a regression - there was a similar bug around 3.5 or
so, but that was fixed upstream.

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1179509

Title:
  'unregister_netdevice: waiting for lo to become free. Usage count = 2'
  is reported and causing kernel hang when floodlight tests are run
  using utah

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