[    1.826125] ip (240) used greatest stack depth: 12376 bytes left
[    2.361657] ip (274) used greatest stack depth: 12344 bytes left
[  639.619619] ip (8293) used greatest stack depth: 12328 bytes left
[  991.514713] blackhole_netdev_xmit(): Dropping skb.
[  991.514786] blackhole_netdev_xmit(): Dropping skb.
[  991.514831] blackhole_netdev_xmit(): Dropping skb.
[  991.514873] blackhole_netdev_xmit(): Dropping skb.