[    2.352313] ip (273) used greatest stack depth: 12320 bytes left
[    7.752176] ip (795) used greatest stack depth: 12224 bytes left
[  323.374573] ip (1620) used greatest stack depth: 12144 bytes left
[  798.540196] blackhole_netdev_xmit(): Dropping skb.
[  798.540248] blackhole_netdev_xmit(): Dropping skb.
[  798.540280] blackhole_netdev_xmit(): Dropping skb.
[  798.540310] blackhole_netdev_xmit(): Dropping skb.
[ 1068.012211] blackhole_netdev_xmit(): Dropping skb.
[ 1068.012293] blackhole_netdev_xmit(): Dropping skb.
[ 1068.012337] blackhole_netdev_xmit(): Dropping skb.
[ 1068.012391] blackhole_netdev_xmit(): Dropping skb.