[    2.783369] ip (275) used greatest stack depth: 12320 bytes left
[   27.905636] ip (2371) used greatest stack depth: 12160 bytes left
[  869.552294] blackhole_netdev_xmit(): Dropping skb.
[  869.552362] blackhole_netdev_xmit(): Dropping skb.
[  869.552400] blackhole_netdev_xmit(): Dropping skb.
[  869.552430] blackhole_netdev_xmit(): Dropping skb.
[ 1150.195122] blackhole_netdev_xmit(): Dropping skb.
[ 1150.195190] blackhole_netdev_xmit(): Dropping skb.
[ 1150.195223] blackhole_netdev_xmit(): Dropping skb.
[ 1150.195256] blackhole_netdev_xmit(): Dropping skb.