Hi Dave,

Try to reproduce without that patch installed.

If there is any mixup of SKB handling by any element in the
path the packet travels, you're screw up all the TCP
accounting knobs on the socket and easily trigger messages
like the above.

I'll try. FYI we have 70 gigabit cards in that machine, the reason
send-to-self is so useful is that we only need one expensive machine.
Without the patch we need to find two expensive machines with 35
gigabits in each :)

Anton