[    2.104410] ip (277) used greatest stack depth: 12320 bytes left
[  634.257230] ip (31710) used greatest stack depth: 12272 bytes left
[  647.226661] blackhole_netdev_xmit(): Dropping skb.
[  647.226712] blackhole_netdev_xmit(): Dropping skb.
[  647.226742] blackhole_netdev_xmit(): Dropping skb.
[  647.226767] blackhole_netdev_xmit(): Dropping skb.
[ 1112.198658] blackhole_netdev_xmit(): Dropping skb.
[ 1112.198760] blackhole_netdev_xmit(): Dropping skb.
[ 1112.198819] blackhole_netdev_xmit(): Dropping skb.
[ 1112.198883] blackhole_netdev_xmit(): Dropping skb.
[ 1175.162847] blackhole_netdev_xmit(): Dropping skb.
[ 1175.162904] blackhole_netdev_xmit(): Dropping skb.
[ 1175.162939] blackhole_netdev_xmit(): Dropping skb.
[ 1175.162979] blackhole_netdev_xmit(): Dropping skb.
[ 1196.026129] blackhole_netdev_xmit(): Dropping skb.
[ 1196.026182] blackhole_netdev_xmit(): Dropping skb.
[ 1196.026211] blackhole_netdev_xmit(): Dropping skb.
[ 1196.026236] blackhole_netdev_xmit(): Dropping skb.