[    1.847340] ip (243) used greatest stack depth: 12352 bytes left
[    2.409768] ip (277) used greatest stack depth: 12272 bytes left
[  326.762003] ip (31149) used greatest stack depth: 12016 bytes left
[  827.019252] blackhole_netdev_xmit(): Dropping skb.
[  827.019313] blackhole_netdev_xmit(): Dropping skb.
[  827.019341] blackhole_netdev_xmit(): Dropping skb.
[  827.019380] blackhole_netdev_xmit(): Dropping skb.