[    2.433017] ip (275) used greatest stack depth: 12344 bytes left
[  857.284609] blackhole_netdev_xmit(): Dropping skb.
[  857.284676] blackhole_netdev_xmit(): Dropping skb.
[  857.284713] blackhole_netdev_xmit(): Dropping skb.
[  857.284760] blackhole_netdev_xmit(): Dropping skb.
[  975.968940] blackhole_netdev_xmit(): Dropping skb.
[  975.968993] blackhole_netdev_xmit(): Dropping skb.
[  975.969023] blackhole_netdev_xmit(): Dropping skb.
[  975.969048] blackhole_netdev_xmit(): Dropping skb.