[    1.818144] ip (242) used greatest stack depth: 12384 bytes left
[    2.386679] ip (276) used greatest stack depth: 12368 bytes left
[    2.570200] ip (290) used greatest stack depth: 12352 bytes left
[    5.780400] ip (443) used greatest stack depth: 12312 bytes left
[  794.019362] blackhole_netdev_xmit(): Dropping skb.
[  794.019434] blackhole_netdev_xmit(): Dropping skb.
[  794.019471] blackhole_netdev_xmit(): Dropping skb.
[  794.019506] blackhole_netdev_xmit(): Dropping skb.