[    2.061150] ip (246) used greatest stack depth: 12376 bytes left
[    2.794401] ip (280) used greatest stack depth: 12360 bytes left
[    3.015909] ip (295) used greatest stack depth: 12344 bytes left
[  650.500136] ip (23850) used greatest stack depth: 12328 bytes left
[  848.753911] blackhole_netdev_xmit(): Dropping skb.
[  848.753970] blackhole_netdev_xmit(): Dropping skb.
[  848.754005] blackhole_netdev_xmit(): Dropping skb.
[  848.754033] blackhole_netdev_xmit(): Dropping skb.
[  988.403261] blackhole_netdev_xmit(): Dropping skb.
[  988.403321] blackhole_netdev_xmit(): Dropping skb.
[  988.403352] blackhole_netdev_xmit(): Dropping skb.
[  988.403380] blackhole_netdev_xmit(): Dropping skb.