[  843.265860] ip (32613) used greatest stack depth: 12288 bytes left
[  855.872556] ip (1453) used greatest stack depth: 12176 bytes left
[ 1204.020338] blackhole_netdev_xmit(): Dropping skb.
[ 1204.020411] blackhole_netdev_xmit(): Dropping skb.
[ 1204.020452] blackhole_netdev_xmit(): Dropping skb.
[ 1204.020491] blackhole_netdev_xmit(): Dropping skb.