[    2.264393] ip (275) used greatest stack depth: 12320 bytes left
[   16.261239] ip (2150) used greatest stack depth: 12160 bytes left
[  715.255959] blackhole_netdev_xmit(): Dropping skb.
[  715.256031] blackhole_netdev_xmit(): Dropping skb.
[  715.256089] blackhole_netdev_xmit(): Dropping skb.
[  715.256144] blackhole_netdev_xmit(): Dropping skb.
[ 1134.937271] blackhole_netdev_xmit(): Dropping skb.
[ 1134.937348] blackhole_netdev_xmit(): Dropping skb.
[ 1134.937385] blackhole_netdev_xmit(): Dropping skb.
[ 1134.937425] blackhole_netdev_xmit(): Dropping skb.