[    1.899216] ip (248) used greatest stack depth: 12360 bytes left
[    2.452336] ip (282) used greatest stack depth: 12344 bytes left
[    2.493480] ip (286) used greatest stack depth: 12328 bytes left
[   16.988148] ip (1402) used greatest stack depth: 12176 bytes left
[  697.789614] blackhole_netdev_xmit(): Dropping skb.
[  697.789798] blackhole_netdev_xmit(): Dropping skb.
[  697.789838] blackhole_netdev_xmit(): Dropping skb.
[  697.789882] blackhole_netdev_xmit(): Dropping skb.
[  832.085864] blackhole_netdev_xmit(): Dropping skb.
[  832.085933] blackhole_netdev_xmit(): Dropping skb.
[  832.085965] blackhole_netdev_xmit(): Dropping skb.
[  832.086004] blackhole_netdev_xmit(): Dropping skb.