[    1.689968] ip (242) used greatest stack depth: 12352 bytes left
[    2.189458] ip (276) used greatest stack depth: 12320 bytes left
[  654.803010] blackhole_netdev_xmit(): Dropping skb.
[  654.803138] blackhole_netdev_xmit(): Dropping skb.
[  654.803182] blackhole_netdev_xmit(): Dropping skb.
[  654.803219] blackhole_netdev_xmit(): Dropping skb.
[ 1003.391754] blackhole_netdev_xmit(): Dropping skb.
[ 1003.391832] blackhole_netdev_xmit(): Dropping skb.
[ 1003.391869] blackhole_netdev_xmit(): Dropping skb.
[ 1003.391910] blackhole_netdev_xmit(): Dropping skb.