[   10.863997] ip (1077) used greatest stack depth: 12160 bytes left
[   24.337907] ip (2625) used greatest stack depth: 12048 bytes left
[  655.565048] blackhole_netdev_xmit(): Dropping skb.
[  655.565121] blackhole_netdev_xmit(): Dropping skb.
[  655.565160] blackhole_netdev_xmit(): Dropping skb.
[  655.565193] blackhole_netdev_xmit(): Dropping skb.
[  811.740790] blackhole_netdev_xmit(): Dropping skb.
[  811.740844] blackhole_netdev_xmit(): Dropping skb.
[  811.740889] blackhole_netdev_xmit(): Dropping skb.
[  811.740924] blackhole_netdev_xmit(): Dropping skb.