[    1.783161] ip (242) used greatest stack depth: 12832 bytes left
[    1.818586] ip (245) used greatest stack depth: 12304 bytes left
[  908.787258] blackhole_netdev_xmit(): Dropping skb.
[  908.787343] blackhole_netdev_xmit(): Dropping skb.
[  908.787387] blackhole_netdev_xmit(): Dropping skb.
[  908.787420] blackhole_netdev_xmit(): Dropping skb.