[    1.659232] ip (241) used greatest stack depth: 12352 bytes left
[    2.141137] ip (275) used greatest stack depth: 12320 bytes left
[   20.093102] ip (2496) used greatest stack depth: 12048 bytes left
[  818.687457] blackhole_netdev_xmit(): Dropping skb.
[  818.687515] blackhole_netdev_xmit(): Dropping skb.
[  818.687545] blackhole_netdev_xmit(): Dropping skb.
[  818.687575] blackhole_netdev_xmit(): Dropping skb.
[  894.953624] blackhole_netdev_xmit(): Dropping skb.
[  894.953689] blackhole_netdev_xmit(): Dropping skb.
[  894.953744] blackhole_netdev_xmit(): Dropping skb.
[  894.953804] blackhole_netdev_xmit(): Dropping skb.
[  981.572581] blackhole_netdev_xmit(): Dropping skb.
[  981.572641] blackhole_netdev_xmit(): Dropping skb.
[  981.572672] blackhole_netdev_xmit(): Dropping skb.
[  981.572705] blackhole_netdev_xmit(): Dropping skb.