[    2.028259] ip (244) used greatest stack depth: 12376 bytes left
[    2.695329] ip (278) used greatest stack depth: 12360 bytes left
[    2.747871] ip (282) used greatest stack depth: 12344 bytes left
[    9.758417] ip (798) used greatest stack depth: 12200 bytes left
[ 1039.144501] blackhole_netdev_xmit(): Dropping skb.
[ 1039.144570] blackhole_netdev_xmit(): Dropping skb.
[ 1039.144600] blackhole_netdev_xmit(): Dropping skb.
[ 1039.144631] blackhole_netdev_xmit(): Dropping skb.
[ 1072.103670] blackhole_netdev_xmit(): Dropping skb.
[ 1072.103746] blackhole_netdev_xmit(): Dropping skb.
[ 1072.103792] blackhole_netdev_xmit(): Dropping skb.
[ 1072.103837] blackhole_netdev_xmit(): Dropping skb.
[ 1091.497148] blackhole_netdev_xmit(): Dropping skb.
[ 1091.497218] blackhole_netdev_xmit(): Dropping skb.
[ 1091.497266] blackhole_netdev_xmit(): Dropping skb.
[ 1091.497309] blackhole_netdev_xmit(): Dropping skb.