[    1.776987] ip (241) used greatest stack depth: 12352 bytes left
[    1.840859] ip (247) used greatest stack depth: 12304 bytes left
[   25.165137] ip (2367) used greatest stack depth: 12160 bytes left
[  710.109894] blackhole_netdev_xmit(): Dropping skb.
[  710.110043] blackhole_netdev_xmit(): Dropping skb.
[  710.110088] blackhole_netdev_xmit(): Dropping skb.
[  710.110127] blackhole_netdev_xmit(): Dropping skb.
[  985.283667] blackhole_netdev_xmit(): Dropping skb.
[  985.283720] blackhole_netdev_xmit(): Dropping skb.
[  985.283750] blackhole_netdev_xmit(): Dropping skb.
[  985.283781] blackhole_netdev_xmit(): Dropping skb.