[    1.922116] ip (244) used greatest stack depth: 12416 bytes left
[    1.955579] ip (247) used greatest stack depth: 12352 bytes left
[    2.478984] ip (275) used greatest stack depth: 12320 bytes left
[ 1007.110619] blackhole_netdev_xmit(): Dropping skb.
[ 1007.110700] blackhole_netdev_xmit(): Dropping skb.
[ 1007.110733] blackhole_netdev_xmit(): Dropping skb.
[ 1007.110774] blackhole_netdev_xmit(): Dropping skb.
[ 1087.640176] blackhole_netdev_xmit(): Dropping skb.
[ 1087.640246] blackhole_netdev_xmit(): Dropping skb.
[ 1087.640289] blackhole_netdev_xmit(): Dropping skb.
[ 1087.640327] blackhole_netdev_xmit(): Dropping skb.