[    2.107774] ip (274) used greatest stack depth: 12320 bytes left
[  671.236805] blackhole_netdev_xmit(): Dropping skb.
[  671.236864] blackhole_netdev_xmit(): Dropping skb.
[  671.236895] blackhole_netdev_xmit(): Dropping skb.
[  671.236926] blackhole_netdev_xmit(): Dropping skb.
[ 1185.518469] blackhole_netdev_xmit(): Dropping skb.
[ 1185.518539] blackhole_netdev_xmit(): Dropping skb.
[ 1185.518576] blackhole_netdev_xmit(): Dropping skb.
[ 1185.518612] blackhole_netdev_xmit(): Dropping skb.