[    2.472224] ip (276) used greatest stack depth: 12352 bytes left
[   16.081819] ip (1369) used greatest stack depth: 12336 bytes left
[  863.818855] blackhole_netdev_xmit(): Dropping skb.
[  863.818923] blackhole_netdev_xmit(): Dropping skb.
[  863.818962] blackhole_netdev_xmit(): Dropping skb.
[  863.818994] blackhole_netdev_xmit(): Dropping skb.
[  906.315277] blackhole_netdev_xmit(): Dropping skb.
[  906.315329] blackhole_netdev_xmit(): Dropping skb.
[  906.315362] blackhole_netdev_xmit(): Dropping skb.
[  906.315395] blackhole_netdev_xmit(): Dropping skb.