[    2.350270] ip (276) used greatest stack depth: 12344 bytes left
[  673.581538] blackhole_netdev_xmit(): Dropping skb.
[  673.581630] blackhole_netdev_xmit(): Dropping skb.
[  673.581670] blackhole_netdev_xmit(): Dropping skb.
[  673.581708] blackhole_netdev_xmit(): Dropping skb.