[    2.378196] ip (248) used greatest stack depth: 12376 bytes left
[    2.987520] ip (282) used greatest stack depth: 12360 bytes left
[    7.289891] ip (445) used greatest stack depth: 12344 bytes left
[   23.636463] ip (2140) used greatest stack depth: 12288 bytes left
[  670.239901] blackhole_netdev_xmit(): Dropping skb.
[  670.239970] blackhole_netdev_xmit(): Dropping skb.
[  670.240014] blackhole_netdev_xmit(): Dropping skb.
[  670.240055] blackhole_netdev_xmit(): Dropping skb.
[  686.526716] blackhole_netdev_xmit(): Dropping skb.
[  686.526804] blackhole_netdev_xmit(): Dropping skb.
[  686.526856] blackhole_netdev_xmit(): Dropping skb.
[  686.526920] blackhole_netdev_xmit(): Dropping skb.
[  689.412457] blackhole_netdev_xmit(): Dropping skb.
[  689.412521] blackhole_netdev_xmit(): Dropping skb.
[  689.412563] blackhole_netdev_xmit(): Dropping skb.
[  689.412609] blackhole_netdev_xmit(): Dropping skb.
[  699.988674] blackhole_netdev_xmit(): Dropping skb.
[  699.988749] blackhole_netdev_xmit(): Dropping skb.
[  699.988792] blackhole_netdev_xmit(): Dropping skb.
[  699.988835] blackhole_netdev_xmit(): Dropping skb.
[  708.718097] blackhole_netdev_xmit(): Dropping skb.
[  708.718153] blackhole_netdev_xmit(): Dropping skb.
[  708.718187] blackhole_netdev_xmit(): Dropping skb.
[  708.718219] blackhole_netdev_xmit(): Dropping skb.
[ 1019.354381] blackhole_netdev_xmit(): Dropping skb.
[ 1019.354451] blackhole_netdev_xmit(): Dropping skb.
[ 1019.354486] blackhole_netdev_xmit(): Dropping skb.
[ 1019.354528] blackhole_netdev_xmit(): Dropping skb.