[    2.027787] ip (275) used greatest stack depth: 12320 bytes left
[  856.632344] blackhole_netdev_xmit(): Dropping skb.
[  856.632418] blackhole_netdev_xmit(): Dropping skb.
[  856.632456] blackhole_netdev_xmit(): Dropping skb.
[  856.632508] blackhole_netdev_xmit(): Dropping skb.
[  923.046901] blackhole_netdev_xmit(): Dropping skb.
[  923.046980] blackhole_netdev_xmit(): Dropping skb.
[  923.047020] blackhole_netdev_xmit(): Dropping skb.
[  923.047057] blackhole_netdev_xmit(): Dropping skb.