[    2.480785] ip (274) used greatest stack depth: 12344 bytes left
[   24.842599] ip (2493) used greatest stack depth: 12296 bytes left
[  649.032789] blackhole_netdev_xmit(): Dropping skb.
[  649.032859] blackhole_netdev_xmit(): Dropping skb.
[  649.032894] blackhole_netdev_xmit(): Dropping skb.
[  649.032936] blackhole_netdev_xmit(): Dropping skb.