[    2.348356] ip (280) used greatest stack depth: 12360 bytes left
[    2.531265] ip (294) used greatest stack depth: 12344 bytes left
[   11.647310] ip (1077) used greatest stack depth: 12304 bytes left
[  792.434517] blackhole_netdev_xmit(): Dropping skb.
[  792.434599] blackhole_netdev_xmit(): Dropping skb.
[  792.434657] blackhole_netdev_xmit(): Dropping skb.
[  792.434713] blackhole_netdev_xmit(): Dropping skb.
[  914.345866] blackhole_netdev_xmit(): Dropping skb.
[  914.345931] blackhole_netdev_xmit(): Dropping skb.
[  914.345970] blackhole_netdev_xmit(): Dropping skb.
[  914.346008] blackhole_netdev_xmit(): Dropping skb.