[    2.560165] ip (276) used greatest stack depth: 12352 bytes left
[    5.821402] ip (439) used greatest stack depth: 12344 bytes left
[    7.804187] ip (652) used greatest stack depth: 12072 bytes left
[  677.066701] blackhole_netdev_xmit(): Dropping skb.
[  677.066866] blackhole_netdev_xmit(): Dropping skb.
[  677.066899] blackhole_netdev_xmit(): Dropping skb.
[  677.066931] blackhole_netdev_xmit(): Dropping skb.
[  784.808749] blackhole_netdev_xmit(): Dropping skb.
[  784.808802] blackhole_netdev_xmit(): Dropping skb.
[  784.808832] blackhole_netdev_xmit(): Dropping skb.
[  784.808864] blackhole_netdev_xmit(): Dropping skb.
[ 1073.922485] blackhole_netdev_xmit(): Dropping skb.
[ 1073.922571] blackhole_netdev_xmit(): Dropping skb.
[ 1073.922610] blackhole_netdev_xmit(): Dropping skb.
[ 1073.922649] blackhole_netdev_xmit(): Dropping skb.
[ 1215.323714] blackhole_netdev_xmit(): Dropping skb.
[ 1215.323791] blackhole_netdev_xmit(): Dropping skb.
[ 1215.323856] blackhole_netdev_xmit(): Dropping skb.
[ 1215.323933] blackhole_netdev_xmit(): Dropping skb.