[    2.603419] ip (277) used greatest stack depth: 12360 bytes left
[    2.840492] ip (291) used greatest stack depth: 12344 bytes left
[  672.499989] blackhole_netdev_xmit(): Dropping skb.
[  672.500056] blackhole_netdev_xmit(): Dropping skb.
[  672.500090] blackhole_netdev_xmit(): Dropping skb.
[  672.500123] blackhole_netdev_xmit(): Dropping skb.
[  718.348527] blackhole_netdev_xmit(): Dropping skb.
[  718.348600] blackhole_netdev_xmit(): Dropping skb.
[  718.348636] blackhole_netdev_xmit(): Dropping skb.
[  718.348669] blackhole_netdev_xmit(): Dropping skb.
[  778.640264] blackhole_netdev_xmit(): Dropping skb.
[  778.640335] blackhole_netdev_xmit(): Dropping skb.
[  778.640376] blackhole_netdev_xmit(): Dropping skb.
[  778.640417] blackhole_netdev_xmit(): Dropping skb.