[    1.964649] ip (246) used greatest stack depth: 12376 bytes left
[    2.547941] ip (277) used greatest stack depth: 12360 bytes left
[    2.598198] ip (281) used greatest stack depth: 12352 bytes left
[    5.879247] ip (444) used greatest stack depth: 12344 bytes left
[  713.415414] blackhole_netdev_xmit(): Dropping skb.
[  713.415495] blackhole_netdev_xmit(): Dropping skb.
[  713.415544] blackhole_netdev_xmit(): Dropping skb.
[  713.415590] blackhole_netdev_xmit(): Dropping skb.
[  745.090302] blackhole_netdev_xmit(): Dropping skb.
[  745.090369] blackhole_netdev_xmit(): Dropping skb.
[  745.090405] blackhole_netdev_xmit(): Dropping skb.
[  745.090442] blackhole_netdev_xmit(): Dropping skb.
[  924.779944] blackhole_netdev_xmit(): Dropping skb.
[  924.780019] blackhole_netdev_xmit(): Dropping skb.
[  924.780068] blackhole_netdev_xmit(): Dropping skb.
[  924.780110] blackhole_netdev_xmit(): Dropping skb.
[  948.626016] blackhole_netdev_xmit(): Dropping skb.
[  948.626074] blackhole_netdev_xmit(): Dropping skb.
[  948.626108] blackhole_netdev_xmit(): Dropping skb.
[  948.626143] blackhole_netdev_xmit(): Dropping skb.