[    2.429470] ip (244) used greatest stack depth: 12352 bytes left
[    3.200175] ip (275) used greatest stack depth: 12320 bytes left
[    3.377777] ip (289) used greatest stack depth: 12160 bytes left
[  760.150831] blackhole_netdev_xmit(): Dropping skb.
[  760.150892] blackhole_netdev_xmit(): Dropping skb.
[  760.150928] blackhole_netdev_xmit(): Dropping skb.
[  760.150963] blackhole_netdev_xmit(): Dropping skb.
[  793.045565] blackhole_netdev_xmit(): Dropping skb.
[  793.045639] blackhole_netdev_xmit(): Dropping skb.
[  793.045685] blackhole_netdev_xmit(): Dropping skb.
[  793.045729] blackhole_netdev_xmit(): Dropping skb.