[    1.814895] ip (246) used greatest stack depth: 12384 bytes left
[    2.441987] ip (277) used greatest stack depth: 12368 bytes left
[    2.680815] ip (291) used greatest stack depth: 12352 bytes left
[   20.913967] ip (2136) used greatest stack depth: 12248 bytes left
[  984.515184] blackhole_netdev_xmit(): Dropping skb.
[  984.515253] blackhole_netdev_xmit(): Dropping skb.
[  984.515284] blackhole_netdev_xmit(): Dropping skb.
[  984.515312] blackhole_netdev_xmit(): Dropping skb.
[  987.256413] blackhole_netdev_xmit(): Dropping skb.
[  987.256463] blackhole_netdev_xmit(): Dropping skb.
[  987.256494] blackhole_netdev_xmit(): Dropping skb.
[  987.256527] blackhole_netdev_xmit(): Dropping skb.
[  989.615170] blackhole_netdev_xmit(): Dropping skb.
[  989.615219] blackhole_netdev_xmit(): Dropping skb.
[  989.615248] blackhole_netdev_xmit(): Dropping skb.
[  989.615274] blackhole_netdev_xmit(): Dropping skb.