[    2.342074] ip (277) used greatest stack depth: 12320 bytes left
[  624.627642] ip (797) used greatest stack depth: 12304 bytes left
[  835.219151] blackhole_netdev_xmit(): Dropping skb.
[  835.219206] blackhole_netdev_xmit(): Dropping skb.
[  835.219239] blackhole_netdev_xmit(): Dropping skb.
[  835.219267] blackhole_netdev_xmit(): Dropping skb.
[ 1137.745830] blackhole_netdev_xmit(): Dropping skb.
[ 1137.745888] blackhole_netdev_xmit(): Dropping skb.
[ 1137.745918] blackhole_netdev_xmit(): Dropping skb.
[ 1137.745944] blackhole_netdev_xmit(): Dropping skb.