[    2.066915] ip (277) used greatest stack depth: 12320 bytes left
[   17.988975] ip (2136) used greatest stack depth: 12160 bytes left
[  718.412499] blackhole_netdev_xmit(): Dropping skb.
[  718.412573] blackhole_netdev_xmit(): Dropping skb.
[  718.412631] blackhole_netdev_xmit(): Dropping skb.
[  718.412691] blackhole_netdev_xmit(): Dropping skb.
[  727.412968] blackhole_netdev_xmit(): Dropping skb.
[  727.413030] blackhole_netdev_xmit(): Dropping skb.
[  727.413066] blackhole_netdev_xmit(): Dropping skb.
[  727.413115] blackhole_netdev_xmit(): Dropping skb.
[  842.642231] blackhole_netdev_xmit(): Dropping skb.
[  842.642297] blackhole_netdev_xmit(): Dropping skb.
[  842.642330] blackhole_netdev_xmit(): Dropping skb.
[  842.642369] blackhole_netdev_xmit(): Dropping skb.