[    2.025013] ip (246) used greatest stack depth: 12328 bytes left
[  330.484051] ip (29042) used greatest stack depth: 12200 bytes left
[ 1134.303744] blackhole_netdev_xmit(): Dropping skb.
[ 1134.303822] blackhole_netdev_xmit(): Dropping skb.
[ 1134.303856] blackhole_netdev_xmit(): Dropping skb.
[ 1134.303892] blackhole_netdev_xmit(): Dropping skb.