[    2.609408] ip (278) used greatest stack depth: 12360 bytes left
[    2.662908] ip (282) used greatest stack depth: 12344 bytes left
[    9.503052] ip (788) used greatest stack depth: 12200 bytes left
[  728.965015] blackhole_netdev_xmit(): Dropping skb.
[  728.965084] blackhole_netdev_xmit(): Dropping skb.
[  728.965132] blackhole_netdev_xmit(): Dropping skb.
[  728.965182] blackhole_netdev_xmit(): Dropping skb.
[  903.022100] blackhole_netdev_xmit(): Dropping skb.
[  903.022163] blackhole_netdev_xmit(): Dropping skb.
[  903.022202] blackhole_netdev_xmit(): Dropping skb.
[  903.022237] blackhole_netdev_xmit(): Dropping skb.
[  975.881115] blackhole_netdev_xmit(): Dropping skb.
[  975.881192] blackhole_netdev_xmit(): Dropping skb.
[  975.881241] blackhole_netdev_xmit(): Dropping skb.
[  975.881284] blackhole_netdev_xmit(): Dropping skb.
[ 1079.144561] blackhole_netdev_xmit(): Dropping skb.
[ 1079.144619] blackhole_netdev_xmit(): Dropping skb.
[ 1079.144650] blackhole_netdev_xmit(): Dropping skb.
[ 1079.144679] blackhole_netdev_xmit(): Dropping skb.
[ 1094.318129] blackhole_netdev_xmit(): Dropping skb.
[ 1094.318179] blackhole_netdev_xmit(): Dropping skb.
[ 1094.318211] blackhole_netdev_xmit(): Dropping skb.
[ 1094.318237] blackhole_netdev_xmit(): Dropping skb.