[    2.257962] ip (275) used greatest stack depth: 12320 bytes left
[  720.544879] blackhole_netdev_xmit(): Dropping skb.
[  720.544948] blackhole_netdev_xmit(): Dropping skb.
[  720.544978] blackhole_netdev_xmit(): Dropping skb.
[  720.545008] blackhole_netdev_xmit(): Dropping skb.
[ 1097.622573] blackhole_netdev_xmit(): Dropping skb.
[ 1097.622652] blackhole_netdev_xmit(): Dropping skb.
[ 1097.622685] blackhole_netdev_xmit(): Dropping skb.
[ 1097.622719] blackhole_netdev_xmit(): Dropping skb.