[    2.246213] ip (274) used greatest stack depth: 12320 bytes left
[   11.874864] ip (1183) used greatest stack depth: 12160 bytes left
[ 1062.074031] blackhole_netdev_xmit(): Dropping skb.
[ 1062.074093] blackhole_netdev_xmit(): Dropping skb.
[ 1062.074127] blackhole_netdev_xmit(): Dropping skb.
[ 1062.074164] blackhole_netdev_xmit(): Dropping skb.