[    1.769156] ip (242) used greatest stack depth: 12352 bytes left
[    2.216602] ip (276) used greatest stack depth: 12320 bytes left
[   11.844242] ip (1175) used greatest stack depth: 12272 bytes left
[  627.470529] ip (14439) used greatest stack depth: 12160 bytes left
[  745.242567] blackhole_netdev_xmit(): Dropping skb.
[  745.242624] blackhole_netdev_xmit(): Dropping skb.
[  745.242656] blackhole_netdev_xmit(): Dropping skb.
[  745.242693] blackhole_netdev_xmit(): Dropping skb.
[ 1029.356911] blackhole_netdev_xmit(): Dropping skb.
[ 1029.356982] blackhole_netdev_xmit(): Dropping skb.
[ 1029.357023] blackhole_netdev_xmit(): Dropping skb.
[ 1029.357053] blackhole_netdev_xmit(): Dropping skb.