[    1.866617] ip (246) used greatest stack depth: 12384 bytes left
[    2.453602] ip (277) used greatest stack depth: 12352 bytes left
[   11.547013] ip (1072) used greatest stack depth: 12072 bytes left
[  705.971477] blackhole_netdev_xmit(): Dropping skb.
[  705.971545] blackhole_netdev_xmit(): Dropping skb.
[  705.971585] blackhole_netdev_xmit(): Dropping skb.
[  705.971628] blackhole_netdev_xmit(): Dropping skb.
[  706.231016] blackhole_netdev_xmit(): Dropping skb.
[  706.231091] blackhole_netdev_xmit(): Dropping skb.
[  706.231141] blackhole_netdev_xmit(): Dropping skb.
[  706.231191] blackhole_netdev_xmit(): Dropping skb.
[  822.095122] blackhole_netdev_xmit(): Dropping skb.
[  822.095184] blackhole_netdev_xmit(): Dropping skb.
[  822.095223] blackhole_netdev_xmit(): Dropping skb.
[  822.095260] blackhole_netdev_xmit(): Dropping skb.
[  840.593431] blackhole_netdev_xmit(): Dropping skb.
[  840.593484] blackhole_netdev_xmit(): Dropping skb.
[  840.593515] blackhole_netdev_xmit(): Dropping skb.
[  840.593542] blackhole_netdev_xmit(): Dropping skb.