[    2.571182] ip (277) used greatest stack depth: 12352 bytes left
[   16.334386] ip (1363) used greatest stack depth: 12336 bytes left
[  868.214994] blackhole_netdev_xmit(): Dropping skb.
[  868.215064] blackhole_netdev_xmit(): Dropping skb.
[  868.215109] blackhole_netdev_xmit(): Dropping skb.
[  868.215160] blackhole_netdev_xmit(): Dropping skb.
[ 1121.628353] blackhole_netdev_xmit(): Dropping skb.
[ 1121.628424] blackhole_netdev_xmit(): Dropping skb.
[ 1121.628460] blackhole_netdev_xmit(): Dropping skb.
[ 1121.628501] blackhole_netdev_xmit(): Dropping skb.