[    1.840105] ip (241) used greatest stack depth: 12560 bytes left
[    2.413183] ip (275) used greatest stack depth: 12336 bytes left
[   20.868460] ip (2187) used greatest stack depth: 12320 bytes left
[ 1122.819384] blackhole_netdev_xmit(): Dropping skb.
[ 1122.819477] blackhole_netdev_xmit(): Dropping skb.
[ 1122.819526] blackhole_netdev_xmit(): Dropping skb.
[ 1122.819575] blackhole_netdev_xmit(): Dropping skb.
[ 1176.326552] blackhole_netdev_xmit(): Dropping skb.
[ 1176.326618] blackhole_netdev_xmit(): Dropping skb.
[ 1176.326660] blackhole_netdev_xmit(): Dropping skb.
[ 1176.326711] blackhole_netdev_xmit(): Dropping skb.