[    1.775644] ip (243) used greatest stack depth: 12416 bytes left
[    1.827757] ip (246) used greatest stack depth: 12352 bytes left
[    2.486336] ip (277) used greatest stack depth: 12320 bytes left
[   10.764622] ip (948) used greatest stack depth: 12224 bytes left
[  946.025899] blackhole_netdev_xmit(): Dropping skb.
[  946.025998] blackhole_netdev_xmit(): Dropping skb.
[  946.026043] blackhole_netdev_xmit(): Dropping skb.
[  946.026102] blackhole_netdev_xmit(): Dropping skb.
[ 1173.806759] blackhole_netdev_xmit(): Dropping skb.
[ 1173.806817] blackhole_netdev_xmit(): Dropping skb.
[ 1173.806854] blackhole_netdev_xmit(): Dropping skb.
[ 1173.806892] blackhole_netdev_xmit(): Dropping skb.
[ 1196.654952] blackhole_netdev_xmit(): Dropping skb.
[ 1196.655004] blackhole_netdev_xmit(): Dropping skb.
[ 1196.655035] blackhole_netdev_xmit(): Dropping skb.
[ 1196.655067] blackhole_netdev_xmit(): Dropping skb.