[    2.547906] ip (277) used greatest stack depth: 12320 bytes left
[ 1202.298061] blackhole_netdev_xmit(): Dropping skb.
[ 1202.298126] blackhole_netdev_xmit(): Dropping skb.
[ 1202.298158] blackhole_netdev_xmit(): Dropping skb.
[ 1202.298195] blackhole_netdev_xmit(): Dropping skb.