[    1.794306] ip (243) used greatest stack depth: 12304 bytes left
[  740.342025] blackhole_netdev_xmit(): Dropping skb.
[  740.342088] blackhole_netdev_xmit(): Dropping skb.
[  740.342118] blackhole_netdev_xmit(): Dropping skb.
[  740.342148] blackhole_netdev_xmit(): Dropping skb.
[  874.515729] blackhole_netdev_xmit(): Dropping skb.
[  874.515791] blackhole_netdev_xmit(): Dropping skb.
[  874.515822] blackhole_netdev_xmit(): Dropping skb.
[  874.515852] blackhole_netdev_xmit(): Dropping skb.