[    1.984357] ip (241) used greatest stack depth: 12352 bytes left
[    2.570367] ip (275) used greatest stack depth: 12320 bytes left
[   15.432001] ip (1363) used greatest stack depth: 12304 bytes left
[   26.455513] ip (2493) used greatest stack depth: 12272 bytes left
[ 1086.697123] blackhole_netdev_xmit(): Dropping skb.
[ 1086.697186] blackhole_netdev_xmit(): Dropping skb.
[ 1086.697218] blackhole_netdev_xmit(): Dropping skb.
[ 1086.697250] blackhole_netdev_xmit(): Dropping skb.