kernel logs "v_type 1" and "f_type 1"

[Axel Rau]

A firewall box (dual Atom N270, 2GB, 5 nics, running 5.8-current (GENERIC.MP)
#1219)
suddenly started logging
        v_type 1
        f_type 1
(up to 40 times/sec) and stopped routing.

The effect went away after disconnecting all but one nic.

Any help appreciated,
Axel
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PGP-Key:29E99DD6  ☀  computing @ chaos claudius