[    1.787789] ip (244) used greatest stack depth: 12352 bytes left
[    2.408422] ip (275) used greatest stack depth: 12320 bytes left
[  706.117834] blackhole_netdev_xmit(): Dropping skb.
[  706.117910] blackhole_netdev_xmit(): Dropping skb.
[  706.117956] blackhole_netdev_xmit(): Dropping skb.
[  706.117993] blackhole_netdev_xmit(): Dropping skb.
[ 1162.974644] blackhole_netdev_xmit(): Dropping skb.
[ 1162.974733] blackhole_netdev_xmit(): Dropping skb.
[ 1162.974785] blackhole_netdev_xmit(): Dropping skb.
[ 1162.974838] blackhole_netdev_xmit(): Dropping skb.