[    2.143997] ip (249) used greatest stack depth: 12352 bytes left
[    2.745749] ip (277) used greatest stack depth: 12320 bytes left
[   13.945212] ip (1142) used greatest stack depth: 12304 bytes left
[   27.174940] ip (2497) used greatest stack depth: 12272 bytes left
[  650.359291] ip (27774) used greatest stack depth: 12160 bytes left
[ 1013.606854] blackhole_netdev_xmit(): Dropping skb.
[ 1013.606911] blackhole_netdev_xmit(): Dropping skb.
[ 1013.606943] blackhole_netdev_xmit(): Dropping skb.
[ 1013.606976] blackhole_netdev_xmit(): Dropping skb.
[ 1018.957451] blackhole_netdev_xmit(): Dropping skb.
[ 1018.957500] blackhole_netdev_xmit(): Dropping skb.
[ 1018.957533] blackhole_netdev_xmit(): Dropping skb.
[ 1018.957565] blackhole_netdev_xmit(): Dropping skb.