[    1.679893] ip (245) used greatest stack depth: 12352 bytes left
[    2.080674] ip (276) used greatest stack depth: 12320 bytes left
[  658.879210] blackhole_netdev_xmit(): Dropping skb.
[  658.879302] blackhole_netdev_xmit(): Dropping skb.
[  658.879363] blackhole_netdev_xmit(): Dropping skb.
[  658.879430] blackhole_netdev_xmit(): Dropping skb.
[ 1232.882033] blackhole_netdev_xmit(): Dropping skb.
[ 1232.882102] blackhole_netdev_xmit(): Dropping skb.
[ 1232.882135] blackhole_netdev_xmit(): Dropping skb.
[ 1232.882172] blackhole_netdev_xmit(): Dropping skb.