[    2.552753] ip (276) used greatest stack depth: 12320 bytes left
[   19.098998] ip (2101) used greatest stack depth: 12304 bytes left
[  761.479015] blackhole_netdev_xmit(): Dropping skb.
[  761.479091] blackhole_netdev_xmit(): Dropping skb.
[  761.479127] blackhole_netdev_xmit(): Dropping skb.
[  761.479163] blackhole_netdev_xmit(): Dropping skb.
[  890.126859] blackhole_netdev_xmit(): Dropping skb.
[  890.126933] blackhole_netdev_xmit(): Dropping skb.
[  890.126966] blackhole_netdev_xmit(): Dropping skb.
[  890.126998] blackhole_netdev_xmit(): Dropping skb.