[    1.833386] ip (241) used greatest stack depth: 12384 bytes left
[    2.458586] ip (275) used greatest stack depth: 12368 bytes left
[    2.506447] ip (279) used greatest stack depth: 12352 bytes left
[ 1021.148332] blackhole_netdev_xmit(): Dropping skb.
[ 1021.148418] blackhole_netdev_xmit(): Dropping skb.
[ 1021.148462] blackhole_netdev_xmit(): Dropping skb.
[ 1021.148501] blackhole_netdev_xmit(): Dropping skb.
[ 1200.024244] blackhole_netdev_xmit(): Dropping skb.
[ 1200.024326] blackhole_netdev_xmit(): Dropping skb.
[ 1200.024369] blackhole_netdev_xmit(): Dropping skb.
[ 1200.024411] blackhole_netdev_xmit(): Dropping skb.