Comment 74 for bug 1403152

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")