[    2.412194] ip (272) used greatest stack depth: 12344 bytes left
[   10.797089] ip (1071) used greatest stack depth: 12296 bytes left
[ 1140.830022] blackhole_netdev_xmit(): Dropping skb.
[ 1140.830139] blackhole_netdev_xmit(): Dropping skb.
[ 1140.830173] blackhole_netdev_xmit(): Dropping skb.
[ 1140.830204] blackhole_netdev_xmit(): Dropping skb.