[    1.606637] ip (241) used greatest stack depth: 12304 bytes left
[   19.212893] ip (2620) used greatest stack depth: 12160 bytes left
[  994.609433] blackhole_netdev_xmit(): Dropping skb.
[  994.609588] blackhole_netdev_xmit(): Dropping skb.
[  994.609627] blackhole_netdev_xmit(): Dropping skb.
[  994.609671] blackhole_netdev_xmit(): Dropping skb.
[ 1220.328378] blackhole_netdev_xmit(): Dropping skb.
[ 1220.328439] blackhole_netdev_xmit(): Dropping skb.
[ 1220.328481] blackhole_netdev_xmit(): Dropping skb.
[ 1220.328519] blackhole_netdev_xmit(): Dropping skb.