There are upstream commits that may fix this problem, I've updated the same ppa 
with a new test build (with only the commits, and without any debug).  If 
anyone can still reproduce this problem, please try the latest kernel in the 
ppa and report if it fixes the problem or not:
https://launchpad.net/~ddstreet/+archive/ubuntu/lp1403152

the upstream commits are:
751eb6b6042a596b0080967c1a529a9fe98dac1d ("ipv6: addrconf: fix dev refcont leak 
when DAD failed") 
a5d0dc810abf3d6b241777467ee1d6efb02575fc ("vti: flush x-netns xfrm cache when 
vti interface is removed")

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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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