[    2.323520] ip (274) used greatest stack depth: 12344 bytes left
[    8.610516] ip (914) used greatest stack depth: 12328 bytes left
[   22.532829] ip (2602) used greatest stack depth: 12056 bytes left
[  950.094959] blackhole_netdev_xmit(): Dropping skb.
[  950.095037] blackhole_netdev_xmit(): Dropping skb.
[  950.095080] blackhole_netdev_xmit(): Dropping skb.
[  950.095120] blackhole_netdev_xmit(): Dropping skb.
[  969.248533] blackhole_netdev_xmit(): Dropping skb.
[  969.248612] blackhole_netdev_xmit(): Dropping skb.
[  969.248671] blackhole_netdev_xmit(): Dropping skb.
[  969.248732] blackhole_netdev_xmit(): Dropping skb.