[    2.475289] ip (276) used greatest stack depth: 12352 bytes left
[   21.015845] ip (2215) used greatest stack depth: 12200 bytes left
[  680.338473] blackhole_netdev_xmit(): Dropping skb.
[  680.338546] blackhole_netdev_xmit(): Dropping skb.
[  680.338591] blackhole_netdev_xmit(): Dropping skb.
[  680.338628] blackhole_netdev_xmit(): Dropping skb.
[  860.006561] blackhole_netdev_xmit(): Dropping skb.
[  860.006628] blackhole_netdev_xmit(): Dropping skb.
[  860.006669] blackhole_netdev_xmit(): Dropping skb.
[  860.006713] blackhole_netdev_xmit(): Dropping skb.
[  965.799716] blackhole_netdev_xmit(): Dropping skb.
[  965.799790] blackhole_netdev_xmit(): Dropping skb.
[  965.799839] blackhole_netdev_xmit(): Dropping skb.
[  965.799888] blackhole_netdev_xmit(): Dropping skb.
[ 1223.838795] blackhole_netdev_xmit(): Dropping skb.
[ 1223.838882] blackhole_netdev_xmit(): Dropping skb.
[ 1223.838927] blackhole_netdev_xmit(): Dropping skb.
[ 1223.838974] blackhole_netdev_xmit(): Dropping skb.