[    2.520351] ip (275) used greatest stack depth: 12352 bytes left
[    2.564971] ip (280) used greatest stack depth: 12336 bytes left
[    7.612823] ip (652) used greatest stack depth: 12056 bytes left
[  669.332952] blackhole_netdev_xmit(): Dropping skb.
[  669.333035] blackhole_netdev_xmit(): Dropping skb.
[  669.333073] blackhole_netdev_xmit(): Dropping skb.
[  669.333117] blackhole_netdev_xmit(): Dropping skb.
[  747.867076] blackhole_netdev_xmit(): Dropping skb.
[  747.867166] blackhole_netdev_xmit(): Dropping skb.
[  747.867221] blackhole_netdev_xmit(): Dropping skb.
[  747.867282] blackhole_netdev_xmit(): Dropping skb.
[  919.612890] blackhole_netdev_xmit(): Dropping skb.
[  919.612946] blackhole_netdev_xmit(): Dropping skb.
[  919.612982] blackhole_netdev_xmit(): Dropping skb.
[  919.613010] blackhole_netdev_xmit(): Dropping skb.
[ 1136.288577] blackhole_netdev_xmit(): Dropping skb.
[ 1136.288657] blackhole_netdev_xmit(): Dropping skb.
[ 1136.288707] blackhole_netdev_xmit(): Dropping skb.
[ 1136.288761] blackhole_netdev_xmit(): Dropping skb.
[ 1203.206087] blackhole_netdev_xmit(): Dropping skb.
[ 1203.206162] blackhole_netdev_xmit(): Dropping skb.
[ 1203.206205] blackhole_netdev_xmit(): Dropping skb.
[ 1203.206252] blackhole_netdev_xmit(): Dropping skb.