[    2.773172] ip (278) used greatest stack depth: 12368 bytes left
[    2.828633] ip (282) used greatest stack depth: 12352 bytes left
[   16.635975] ip (1369) used greatest stack depth: 12336 bytes left
[   17.349079] ip (1411) used greatest stack depth: 12312 bytes left
[  983.801732] blackhole_netdev_xmit(): Dropping skb.
[  983.801788] blackhole_netdev_xmit(): Dropping skb.
[  983.801822] blackhole_netdev_xmit(): Dropping skb.
[  983.801856] blackhole_netdev_xmit(): Dropping skb.
[ 1144.084631] blackhole_netdev_xmit(): Dropping skb.
[ 1144.084710] blackhole_netdev_xmit(): Dropping skb.
[ 1144.084744] blackhole_netdev_xmit(): Dropping skb.
[ 1144.084776] blackhole_netdev_xmit(): Dropping skb.