[    2.169504] ip (276) used greatest stack depth: 12352 bytes left
[    8.376364] ip (783) used greatest stack depth: 12296 bytes left
[  740.533853] blackhole_netdev_xmit(): Dropping skb.
[  740.533918] blackhole_netdev_xmit(): Dropping skb.
[  740.533956] blackhole_netdev_xmit(): Dropping skb.
[  740.533997] blackhole_netdev_xmit(): Dropping skb.
[  857.009153] blackhole_netdev_xmit(): Dropping skb.
[  857.009211] blackhole_netdev_xmit(): Dropping skb.
[  857.009249] blackhole_netdev_xmit(): Dropping skb.
[  857.009284] blackhole_netdev_xmit(): Dropping skb.