[    2.400263] ip (275) used greatest stack depth: 12320 bytes left
[   21.949843] ip (2455) used greatest stack depth: 12304 bytes left
[  628.861157] ip (15786) used greatest stack depth: 12000 bytes left
[ 1096.320241] blackhole_netdev_xmit(): Dropping skb.
[ 1096.320312] blackhole_netdev_xmit(): Dropping skb.
[ 1096.320356] blackhole_netdev_xmit(): Dropping skb.
[ 1096.320397] blackhole_netdev_xmit(): Dropping skb.
[ 1195.558146] blackhole_netdev_xmit(): Dropping skb.
[ 1195.558197] blackhole_netdev_xmit(): Dropping skb.
[ 1195.558228] blackhole_netdev_xmit(): Dropping skb.
[ 1195.558254] blackhole_netdev_xmit(): Dropping skb.
[ 1211.641084] blackhole_netdev_xmit(): Dropping skb.
[ 1211.641141] blackhole_netdev_xmit(): Dropping skb.
[ 1211.641181] blackhole_netdev_xmit(): Dropping skb.
[ 1211.641213] blackhole_netdev_xmit(): Dropping skb.