Jarek Poplawski wrote:

Sorry for my not humble and simplistic opinion, but I'd dare
to remind you are changing "stable" version and even without
this lockups this patch would look very "serious". Why don't
try to restore not-rcu version of qdisc_destroy which looks
not lot to do.

I'm trying to restore the original rules, while keeping the
loopback optimization. That should be safe once I figure out
whats causing the crash.