[    2.132050] ip (245) used greatest stack depth: 12304 bytes left
[  653.273486] blackhole_netdev_xmit(): Dropping skb.
[  653.273566] blackhole_netdev_xmit(): Dropping skb.
[  653.273609] blackhole_netdev_xmit(): Dropping skb.
[  653.273657] blackhole_netdev_xmit(): Dropping skb.
[  669.711431] blackhole_netdev_xmit(): Dropping skb.
[  669.711490] blackhole_netdev_xmit(): Dropping skb.
[  669.711529] blackhole_netdev_xmit(): Dropping skb.
[  669.711558] blackhole_netdev_xmit(): Dropping skb.