[    2.364057] ip (278) used greatest stack depth: 12344 bytes left
[    5.678583] ip (445) used greatest stack depth: 12328 bytes left
[ 1118.556216] blackhole_netdev_xmit(): Dropping skb.
[ 1118.556305] blackhole_netdev_xmit(): Dropping skb.
[ 1118.556342] blackhole_netdev_xmit(): Dropping skb.
[ 1118.556377] blackhole_netdev_xmit(): Dropping skb.