[    1.812542] ip (243) used greatest stack depth: 12352 bytes left
[    2.386991] ip (277) used greatest stack depth: 12320 bytes left
[   24.377912] ip (2340) used greatest stack depth: 12304 bytes left
[  804.875646] blackhole_netdev_xmit(): Dropping skb.
[  804.875732] blackhole_netdev_xmit(): Dropping skb.
[  804.875776] blackhole_netdev_xmit(): Dropping skb.
[  804.875830] blackhole_netdev_xmit(): Dropping skb.