Hi linux-stable, This is a request to backport 751eb6b6 ipv6: addrconf: fix dev refcont leak when DAD failed https://github.com/torvalds/linux/commit/751eb6b6042a596b0080967c1a529a9fe98dac1d to linux-stable 4.4.y branch. It has already been applied to stable master, and 4.7.y, but not longterm 4.4.y We often (1+/week) run into hosts hanging with errors like [1637669.684652] unregister_netdevice: waiting for veth26dc718 to become free. Usage count = 1 [1637679.864366] unregister_netdevice: waiting for veth26dc718 to become free. Usage count = 1 and have been told that this patch likely fixes the problem. I am not on the list so please keep me on CC for any followup. Thanks! Steven
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