[    1.783474] ip (241) used greatest stack depth: 12352 bytes left
[    2.279954] ip (275) used greatest stack depth: 12320 bytes left
[   10.094614] ip (1071) used greatest stack depth: 12160 bytes left
[   20.403600] ip (2381) used greatest stack depth: 12144 bytes left
[  782.804865] blackhole_netdev_xmit(): Dropping skb.
[  782.805002] blackhole_netdev_xmit(): Dropping skb.
[  782.805062] blackhole_netdev_xmit(): Dropping skb.
[  782.805112] blackhole_netdev_xmit(): Dropping skb.
[  790.307153] blackhole_netdev_xmit(): Dropping skb.
[  790.307216] blackhole_netdev_xmit(): Dropping skb.
[  790.307251] blackhole_netdev_xmit(): Dropping skb.
[  790.307288] blackhole_netdev_xmit(): Dropping skb.