[    1.950401] ip (240) used greatest stack depth: 12304 bytes left
[  696.476104] blackhole_netdev_xmit(): Dropping skb.
[  696.476168] blackhole_netdev_xmit(): Dropping skb.
[  696.476202] blackhole_netdev_xmit(): Dropping skb.
[  696.476235] blackhole_netdev_xmit(): Dropping skb.
[  875.246305] blackhole_netdev_xmit(): Dropping skb.
[  875.246367] blackhole_netdev_xmit(): Dropping skb.
[  875.246398] blackhole_netdev_xmit(): Dropping skb.
[  875.246424] blackhole_netdev_xmit(): Dropping skb.