[    1.638745] ip (241) used greatest stack depth: 12304 bytes left
[    7.071356] ip (781) used greatest stack depth: 12160 bytes left
[ 1204.600663] blackhole_netdev_xmit(): Dropping skb.
[ 1204.600735] blackhole_netdev_xmit(): Dropping skb.
[ 1204.600792] blackhole_netdev_xmit(): Dropping skb.
[ 1204.600832] blackhole_netdev_xmit(): Dropping skb.
[ 1236.643228] blackhole_netdev_xmit(): Dropping skb.
[ 1236.643283] blackhole_netdev_xmit(): Dropping skb.
[ 1236.643315] blackhole_netdev_xmit(): Dropping skb.
[ 1236.643342] blackhole_netdev_xmit(): Dropping skb.