[    2.439732] ip (276) used greatest stack depth: 12352 bytes left
[  781.613937] blackhole_netdev_xmit(): Dropping skb.
[  781.613998] blackhole_netdev_xmit(): Dropping skb.
[  781.614032] blackhole_netdev_xmit(): Dropping skb.
[  781.614066] blackhole_netdev_xmit(): Dropping skb.