[    2.426419] ip (275) used greatest stack depth: 12320 bytes left
[ 1254.624103] blackhole_netdev_xmit(): Dropping skb.
[ 1254.624190] blackhole_netdev_xmit(): Dropping skb.
[ 1254.624245] blackhole_netdev_xmit(): Dropping skb.
[ 1254.624306] blackhole_netdev_xmit(): Dropping skb.