[    1.842892] ip (242) used greatest stack depth: 12352 bytes left
[    2.303728] ip (276) used greatest stack depth: 12320 bytes left
[    9.233868] ip (950) used greatest stack depth: 12272 bytes left
[   17.191644] ip (2139) used greatest stack depth: 12224 bytes left
[  810.520214] blackhole_netdev_xmit(): Dropping skb.
[  810.520283] blackhole_netdev_xmit(): Dropping skb.
[  810.520322] blackhole_netdev_xmit(): Dropping skb.
[  810.520359] blackhole_netdev_xmit(): Dropping skb.
[  858.603445] blackhole_netdev_xmit(): Dropping skb.
[  858.603497] blackhole_netdev_xmit(): Dropping skb.
[  858.603531] blackhole_netdev_xmit(): Dropping skb.
[  858.603566] blackhole_netdev_xmit(): Dropping skb.
[ 1238.215570] blackhole_netdev_xmit(): Dropping skb.
[ 1238.215639] blackhole_netdev_xmit(): Dropping skb.
[ 1238.215675] blackhole_netdev_xmit(): Dropping skb.
[ 1238.215703] blackhole_netdev_xmit(): Dropping skb.