[    1.843311] ip (240) used greatest stack depth: 12616 bytes left
[    1.876493] ip (243) used greatest stack depth: 12376 bytes left
[    2.414713] ip (274) used greatest stack depth: 12344 bytes left
[  630.662651] ip (19141) used greatest stack depth: 12312 bytes left
[  954.749608] ip (21663) used greatest stack depth: 12200 bytes left
[  972.405200] blackhole_netdev_xmit(): Dropping skb.
[  972.405252] blackhole_netdev_xmit(): Dropping skb.
[  972.405283] blackhole_netdev_xmit(): Dropping skb.
[  972.405310] blackhole_netdev_xmit(): Dropping skb.
[ 1081.437458] blackhole_netdev_xmit(): Dropping skb.
[ 1081.437553] blackhole_netdev_xmit(): Dropping skb.
[ 1081.437606] blackhole_netdev_xmit(): Dropping skb.
[ 1081.437663] blackhole_netdev_xmit(): Dropping skb.