[    2.034497] ip (240) used greatest stack depth: 12832 bytes left
[    2.661907] ip (275) used greatest stack depth: 12368 bytes left
[    2.713823] ip (279) used greatest stack depth: 12352 bytes left
[  784.059084] blackhole_netdev_xmit(): Dropping skb.
[  784.059151] blackhole_netdev_xmit(): Dropping skb.
[  784.059182] blackhole_netdev_xmit(): Dropping skb.
[  784.059208] blackhole_netdev_xmit(): Dropping skb.
[ 1075.324967] blackhole_netdev_xmit(): Dropping skb.
[ 1075.325046] blackhole_netdev_xmit(): Dropping skb.
[ 1075.325085] blackhole_netdev_xmit(): Dropping skb.
[ 1075.325130] blackhole_netdev_xmit(): Dropping skb.
[ 1190.246488] blackhole_netdev_xmit(): Dropping skb.
[ 1190.246542] blackhole_netdev_xmit(): Dropping skb.
[ 1190.246579] blackhole_netdev_xmit(): Dropping skb.
[ 1190.246606] blackhole_netdev_xmit(): Dropping skb.