I folded it into cerowrt 3.10.7-1 just now. No noise on the patch. I was scared by some of the backtraces you posted, so I'd like to keep the testing simple for a while... and...

I still have the ADSL htb fixes to fold back in from 3.11 to 3.10, to massively update cisco's pie implementation, and to make one more tweak to codel, before I do anything other than compile testing, personally.

Probably will be a couple days.

I have no idea the state of the babel branch on this stuff. My own use case is a system with multiple 6rd, 6in4, 6to4 tunnels in play....

One of my concerns was that: is there an easy way to detect at runtime via netlink if subtrees was working correctly or not?