[    1.880627] ip (245) used greatest stack depth: 12320 bytes left
[    8.874903] ip (783) used greatest stack depth: 12064 bytes left
[  873.890600] blackhole_netdev_xmit(): Dropping skb.
[  873.890669] blackhole_netdev_xmit(): Dropping skb.
[  873.890702] blackhole_netdev_xmit(): Dropping skb.
[  873.890733] blackhole_netdev_xmit(): Dropping skb.
[ 1170.198910] blackhole_netdev_xmit(): Dropping skb.
[ 1170.198978] blackhole_netdev_xmit(): Dropping skb.
[ 1170.199009] blackhole_netdev_xmit(): Dropping skb.
[ 1170.199043] blackhole_netdev_xmit(): Dropping skb.