Alexandre, please see my last comment, that links to a test kernel PPA
with EXACTLY that upstream commit,
751eb6b6042a596b0080967c1a529a9fe98dac1d ("ipv6: addrconf: fix dev
refcont leak when DAD failed")

If you can reproduce this, please test with the PPA and report if it
fixes the problem.

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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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