[    1.996367] ip (242) used greatest stack depth: 12368 bytes left
[    2.621843] ip (276) used greatest stack depth: 12336 bytes left
[   12.815248] ip (1045) used greatest stack depth: 12320 bytes left
[   25.870823] ip (2371) used greatest stack depth: 12288 bytes left
[  748.673775] blackhole_netdev_xmit(): Dropping skb.
[  748.673849] blackhole_netdev_xmit(): Dropping skb.
[  748.673894] blackhole_netdev_xmit(): Dropping skb.
[  748.673946] blackhole_netdev_xmit(): Dropping skb.
[  751.389983] blackhole_netdev_xmit(): Dropping skb.
[  751.390032] blackhole_netdev_xmit(): Dropping skb.
[  751.390061] blackhole_netdev_xmit(): Dropping skb.
[  751.390087] blackhole_netdev_xmit(): Dropping skb.
[ 1073.263758] blackhole_netdev_xmit(): Dropping skb.
[ 1073.263817] blackhole_netdev_xmit(): Dropping skb.
[ 1073.263845] blackhole_netdev_xmit(): Dropping skb.
[ 1073.263870] blackhole_netdev_xmit(): Dropping skb.