[    1.998146] ip (242) used greatest stack depth: 12832 bytes left
[    2.036382] ip (245) used greatest stack depth: 12384 bytes left
[    2.739241] ip (276) used greatest stack depth: 12352 bytes left
[  646.646579] ip (21120) used greatest stack depth: 12344 bytes left
[  954.254356] ip (22893) used greatest stack depth: 12312 bytes left
[ 1021.856740] blackhole_netdev_xmit(): Dropping skb.
[ 1021.856795] blackhole_netdev_xmit(): Dropping skb.
[ 1021.856828] blackhole_netdev_xmit(): Dropping skb.
[ 1021.856860] blackhole_netdev_xmit(): Dropping skb.
[ 1110.427725] blackhole_netdev_xmit(): Dropping skb.
[ 1110.427806] blackhole_netdev_xmit(): Dropping skb.
[ 1110.427852] blackhole_netdev_xmit(): Dropping skb.
[ 1110.427891] blackhole_netdev_xmit(): Dropping skb.