[    2.575849] ip (277) used greatest stack depth: 12352 bytes left
[  999.163255] blackhole_netdev_xmit(): Dropping skb.
[  999.163386] blackhole_netdev_xmit(): Dropping skb.
[  999.163441] blackhole_netdev_xmit(): Dropping skb.
[  999.163496] blackhole_netdev_xmit(): Dropping skb.