[    2.623715] ip (280) used greatest stack depth: 12360 bytes left
[    2.672699] ip (284) used greatest stack depth: 12344 bytes left
[    2.818772] ip (294) used greatest stack depth: 12192 bytes left
[  662.049331] blackhole_netdev_xmit(): Dropping skb.
[  662.049387] blackhole_netdev_xmit(): Dropping skb.
[  662.049418] blackhole_netdev_xmit(): Dropping skb.
[  662.049450] blackhole_netdev_xmit(): Dropping skb.
[  750.050733] blackhole_netdev_xmit(): Dropping skb.
[  750.050812] blackhole_netdev_xmit(): Dropping skb.
[  750.050852] blackhole_netdev_xmit(): Dropping skb.
[  750.050891] blackhole_netdev_xmit(): Dropping skb.
[  800.319644] blackhole_netdev_xmit(): Dropping skb.
[  800.319698] blackhole_netdev_xmit(): Dropping skb.
[  800.319729] blackhole_netdev_xmit(): Dropping skb.
[  800.319770] blackhole_netdev_xmit(): Dropping skb.
[  873.824161] blackhole_netdev_xmit(): Dropping skb.
[  873.824215] blackhole_netdev_xmit(): Dropping skb.
[  873.824247] blackhole_netdev_xmit(): Dropping skb.
[  873.824279] blackhole_netdev_xmit(): Dropping skb.