Don't worry about it. It appears only on very high-traffic networks and won't
crash the system. You can reduce the frequency of messages by doing some
network tuning. If you want, you can increase the number of NMBUFS in the
kernel with
kconfig -n /unix.
You can list your kernel parameters with
kconfig -avn /unix.
--- WARNING ---
Whenever changing kernel parameters, be sure to save a known-good
working /unix file to another name. You can then use this kernel as
a backup in case you create a non-functioning kernel.