[    2.164238] ip (275) used greatest stack depth: 12320 bytes left
[   20.814085] ip (2367) used greatest stack depth: 12160 bytes left
[  731.496277] blackhole_netdev_xmit(): Dropping skb.
[  731.496367] blackhole_netdev_xmit(): Dropping skb.
[  731.496439] blackhole_netdev_xmit(): Dropping skb.
[  731.496515] blackhole_netdev_xmit(): Dropping skb.
[ 1053.740029] blackhole_netdev_xmit(): Dropping skb.
[ 1053.740090] blackhole_netdev_xmit(): Dropping skb.
[ 1053.740122] blackhole_netdev_xmit(): Dropping skb.
[ 1053.740158] blackhole_netdev_xmit(): Dropping skb.