[    2.392108] ip (275) used greatest stack depth: 12336 bytes left
[    4.735335] ip (406) used greatest stack depth: 12320 bytes left
[  648.092409] ip (11214) used greatest stack depth: 12176 bytes left
[  652.483114] blackhole_netdev_xmit(): Dropping skb.
[  652.483172] blackhole_netdev_xmit(): Dropping skb.
[  652.483210] blackhole_netdev_xmit(): Dropping skb.
[  652.483249] blackhole_netdev_xmit(): Dropping skb.
[  752.601285] blackhole_netdev_xmit(): Dropping skb.
[  752.601347] blackhole_netdev_xmit(): Dropping skb.
[  752.601380] blackhole_netdev_xmit(): Dropping skb.
[  752.601414] blackhole_netdev_xmit(): Dropping skb.
[  795.660866] blackhole_netdev_xmit(): Dropping skb.
[  795.660938] blackhole_netdev_xmit(): Dropping skb.
[  795.660998] blackhole_netdev_xmit(): Dropping skb.
[  795.661047] blackhole_netdev_xmit(): Dropping skb.
[  922.607069] blackhole_netdev_xmit(): Dropping skb.
[  922.607131] blackhole_netdev_xmit(): Dropping skb.
[  922.607160] blackhole_netdev_xmit(): Dropping skb.
[  922.607197] blackhole_netdev_xmit(): Dropping skb.