[    2.354414] ip (275) used greatest stack depth: 12352 bytes left
[   24.761109] ip (2367) used greatest stack depth: 12312 bytes left
[  914.279603] blackhole_netdev_xmit(): Dropping skb.
[  914.279673] blackhole_netdev_xmit(): Dropping skb.
[  914.279716] blackhole_netdev_xmit(): Dropping skb.
[  914.279757] blackhole_netdev_xmit(): Dropping skb.