[    2.599708] ip (282) used greatest stack depth: 12288 bytes left
[    2.828366] ip (296) used greatest stack depth: 12064 bytes left
[  708.247542] blackhole_netdev_xmit(): Dropping skb.
[  708.247599] blackhole_netdev_xmit(): Dropping skb.
[  708.247631] blackhole_netdev_xmit(): Dropping skb.
[  708.247660] blackhole_netdev_xmit(): Dropping skb.