[    2.290645] ip (277) used greatest stack depth: 12320 bytes left
[  631.480647] ip (32539) used greatest stack depth: 12304 bytes left
[  641.105444] ip (1210) used greatest stack depth: 12272 bytes left
[  689.049289] blackhole_netdev_xmit(): Dropping skb.
[  689.049360] blackhole_netdev_xmit(): Dropping skb.
[  689.049413] blackhole_netdev_xmit(): Dropping skb.
[  689.049474] blackhole_netdev_xmit(): Dropping skb.
[ 1189.484059] blackhole_netdev_xmit(): Dropping skb.
[ 1189.484134] blackhole_netdev_xmit(): Dropping skb.
[ 1189.484171] blackhole_netdev_xmit(): Dropping skb.
[ 1189.484218] blackhole_netdev_xmit(): Dropping skb.
[ 1217.212831] blackhole_netdev_xmit(): Dropping skb.
[ 1217.212888] blackhole_netdev_xmit(): Dropping skb.
[ 1217.212922] blackhole_netdev_xmit(): Dropping skb.
[ 1217.212960] blackhole_netdev_xmit(): Dropping skb.