[    2.663523] ip (275) used greatest stack depth: 12344 bytes left
[    2.714345] ip (279) used greatest stack depth: 12168 bytes left
[  663.433937] blackhole_netdev_xmit(): Dropping skb.
[  663.434028] blackhole_netdev_xmit(): Dropping skb.
[  663.434083] blackhole_netdev_xmit(): Dropping skb.
[  663.434132] blackhole_netdev_xmit(): Dropping skb.
[ 1228.279662] blackhole_netdev_xmit(): Dropping skb.
[ 1228.279729] blackhole_netdev_xmit(): Dropping skb.
[ 1228.279774] blackhole_netdev_xmit(): Dropping skb.
[ 1228.279816] blackhole_netdev_xmit(): Dropping skb.