[    2.428453] ip (277) used greatest stack depth: 12360 bytes left
[    2.656830] ip (291) used greatest stack depth: 12344 bytes left
[    7.702244] ip (648) used greatest stack depth: 12200 bytes left
[  666.556981] blackhole_netdev_xmit(): Dropping skb.
[  666.557131] blackhole_netdev_xmit(): Dropping skb.
[  666.557184] blackhole_netdev_xmit(): Dropping skb.
[  666.557230] blackhole_netdev_xmit(): Dropping skb.
[  741.546157] blackhole_netdev_xmit(): Dropping skb.
[  741.546221] blackhole_netdev_xmit(): Dropping skb.
[  741.546252] blackhole_netdev_xmit(): Dropping skb.
[  741.546278] blackhole_netdev_xmit(): Dropping skb.
[  816.831242] blackhole_netdev_xmit(): Dropping skb.
[  816.831308] blackhole_netdev_xmit(): Dropping skb.
[  816.831355] blackhole_netdev_xmit(): Dropping skb.
[  816.831400] blackhole_netdev_xmit(): Dropping skb.