[    2.648233] ip (274) used greatest stack depth: 12336 bytes left
[    7.856955] ip (618) used greatest stack depth: 12320 bytes left
[   14.751368] ip (1184) used greatest stack depth: 12160 bytes left
[  665.230003] blackhole_netdev_xmit(): Dropping skb.
[  665.230077] blackhole_netdev_xmit(): Dropping skb.
[  665.230110] blackhole_netdev_xmit(): Dropping skb.
[  665.230144] blackhole_netdev_xmit(): Dropping skb.
[ 1064.844142] blackhole_netdev_xmit(): Dropping skb.
[ 1064.844203] blackhole_netdev_xmit(): Dropping skb.
[ 1064.844233] blackhole_netdev_xmit(): Dropping skb.
[ 1064.844265] blackhole_netdev_xmit(): Dropping skb.