A "prohibit default" route causes crash

[Martin Nicholas]

This bug:
https://bugs.kde.org/show_bug.cgi?id=312677
is apparently the fault of /usr/lib64/libnl-route-3.so.200
so I'm reporting it here.

This is related to the route in a second ip2 routing table:
$ ip route show table vpn
0.0.0.0/1 via 10.10.10.65 dev tap0
prohibit default
128.0.0.0/1 via 10.10.10.65 dev tap0
192.168.0.0/24 dev eth0 proto kernel scope link metric 1
192.168.188.0/24 dev virbr1 proto kernel scope link src 192.168.188.1

A "blackhole default" may well work, but I'm out of my depth a little here.