[    3.035953] ip (241) used greatest stack depth: 12832 bytes left
[    3.697810] ip (275) used greatest stack depth: 12320 bytes left
[   15.940621] ip (1170) used greatest stack depth: 12032 bytes left
[  724.587079] blackhole_netdev_xmit(): Dropping skb.
[  724.587278] blackhole_netdev_xmit(): Dropping skb.
[  724.587344] blackhole_netdev_xmit(): Dropping skb.
[  724.587408] blackhole_netdev_xmit(): Dropping skb.
[ 1080.309137] blackhole_netdev_xmit(): Dropping skb.
[ 1080.309227] blackhole_netdev_xmit(): Dropping skb.
[ 1080.309270] blackhole_netdev_xmit(): Dropping skb.
[ 1080.309323] blackhole_netdev_xmit(): Dropping skb.