[    1.788373] ip (246) used greatest stack depth: 12304 bytes left
[   10.691135] ip (1176) used greatest stack depth: 12272 bytes left
[  845.991987] blackhole_netdev_xmit(): Dropping skb.
[  845.992054] blackhole_netdev_xmit(): Dropping skb.
[  845.992101] blackhole_netdev_xmit(): Dropping skb.
[  845.992155] blackhole_netdev_xmit(): Dropping skb.