It appears that randomness was against me when I updated the arm version
as it crashes when used for real. By forcing one full walk of the mbuf
chain the regression tool crashes, hinting that something is wrong.
Those should abort the bpf program.
The test currently fails (out of bound reads silently return zeros), but
succeeds if lo0 is replaced by an Ethernet interface and 127.0.0.1 by an
address reachable through it.
A fix is being worked on.
Approved by martin.