[    2.229263] ip (245) used greatest stack depth: 12384 bytes left
[    2.829420] ip (276) used greatest stack depth: 12352 bytes left
[    8.709962] ip (649) used greatest stack depth: 12296 bytes left
[    8.764163] ip (653) used greatest stack depth: 12168 bytes left
[  820.640602] blackhole_netdev_xmit(): Dropping skb.
[  820.640688] blackhole_netdev_xmit(): Dropping skb.
[  820.640735] blackhole_netdev_xmit(): Dropping skb.
[  820.640771] blackhole_netdev_xmit(): Dropping skb.
[ 1253.527854] blackhole_netdev_xmit(): Dropping skb.
[ 1253.527913] blackhole_netdev_xmit(): Dropping skb.
[ 1253.527950] blackhole_netdev_xmit(): Dropping skb.
[ 1253.527997] blackhole_netdev_xmit(): Dropping skb.