Ok, it is now a WARN_ON_ONCE() in my tree (which I _just_ pushed out).
So it's going to cause irritating messages (once), but the machine should
hopefully work.
It's going to bisect down to the same commit you already bisected once,
it's the networking code that changed some of the rules, so various
network drivers that didn't follow the expected rules are now unhappy.
Maybe the network drivers are few enough that it will get fixed, or maybe
the WARN_ON_ONCE() will just be removed and the rule not reinforced.
I personally suspect the latter, since it seems to happen with just about
_any_ random network driver, including the common and well-maintained ones
(ie the Gods only help us for the truly odd/random cases)
Linus
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