[    2.563613] ip (274) used greatest stack depth: 12344 bytes left
[  325.139667] ip (6769) used greatest stack depth: 12328 bytes left
[  644.231156] ip (8619) used greatest stack depth: 12296 bytes left
[  683.950939] blackhole_netdev_xmit(): Dropping skb.
[  683.951026] blackhole_netdev_xmit(): Dropping skb.
[  683.951091] blackhole_netdev_xmit(): Dropping skb.
[  683.951181] blackhole_netdev_xmit(): Dropping skb.
[ 1016.963604] blackhole_netdev_xmit(): Dropping skb.
[ 1016.963662] blackhole_netdev_xmit(): Dropping skb.
[ 1016.963691] blackhole_netdev_xmit(): Dropping skb.
[ 1016.963725] blackhole_netdev_xmit(): Dropping skb.
[ 1159.210094] blackhole_netdev_xmit(): Dropping skb.
[ 1159.210158] blackhole_netdev_xmit(): Dropping skb.
[ 1159.210198] blackhole_netdev_xmit(): Dropping skb.
[ 1159.210242] blackhole_netdev_xmit(): Dropping skb.