[    1.776754] ip (241) used greatest stack depth: 12352 bytes left
[    2.283410] ip (275) used greatest stack depth: 12320 bytes left
[    8.112697] ip (783) used greatest stack depth: 12160 bytes left
[  686.786542] blackhole_netdev_xmit(): Dropping skb.
[  686.786600] blackhole_netdev_xmit(): Dropping skb.
[  686.786629] blackhole_netdev_xmit(): Dropping skb.
[  686.786655] blackhole_netdev_xmit(): Dropping skb.
[  749.843553] blackhole_netdev_xmit(): Dropping skb.
[  749.843607] blackhole_netdev_xmit(): Dropping skb.
[  749.843639] blackhole_netdev_xmit(): Dropping skb.
[  749.843668] blackhole_netdev_xmit(): Dropping skb.
[  753.777306] blackhole_netdev_xmit(): Dropping skb.
[  753.777357] blackhole_netdev_xmit(): Dropping skb.
[  753.777386] blackhole_netdev_xmit(): Dropping skb.
[  753.777420] blackhole_netdev_xmit(): Dropping skb.