[    1.943345] ip (242) used greatest stack depth: 12384 bytes left
[    2.559447] ip (276) used greatest stack depth: 12368 bytes left
[    2.605719] ip (280) used greatest stack depth: 12352 bytes left
[   20.242547] ip (2103) used greatest stack depth: 12336 bytes left
[  647.847980] ip (20418) used greatest stack depth: 12296 bytes left
[  651.948201] blackhole_netdev_xmit(): Dropping skb.
[  651.948264] blackhole_netdev_xmit(): Dropping skb.
[  651.948305] blackhole_netdev_xmit(): Dropping skb.
[  651.948353] blackhole_netdev_xmit(): Dropping skb.
[ 1120.137237] blackhole_netdev_xmit(): Dropping skb.
[ 1120.137318] blackhole_netdev_xmit(): Dropping skb.
[ 1120.137366] blackhole_netdev_xmit(): Dropping skb.
[ 1120.137409] blackhole_netdev_xmit(): Dropping skb.
[ 1244.118331] blackhole_netdev_xmit(): Dropping skb.
[ 1244.118388] blackhole_netdev_xmit(): Dropping skb.
[ 1244.118431] blackhole_netdev_xmit(): Dropping skb.
[ 1244.118467] blackhole_netdev_xmit(): Dropping skb.