[    2.339398] ip (276) used greatest stack depth: 12320 bytes left
[   13.077772] ip (1401) used greatest stack depth: 12160 bytes left
[  744.238748] blackhole_netdev_xmit(): Dropping skb.
[  744.238814] blackhole_netdev_xmit(): Dropping skb.
[  744.238852] blackhole_netdev_xmit(): Dropping skb.
[  744.238891] blackhole_netdev_xmit(): Dropping skb.
[  826.378661] blackhole_netdev_xmit(): Dropping skb.
[  826.378731] blackhole_netdev_xmit(): Dropping skb.
[  826.378775] blackhole_netdev_xmit(): Dropping skb.
[  826.378821] blackhole_netdev_xmit(): Dropping skb.
[  873.163425] blackhole_netdev_xmit(): Dropping skb.
[  873.163493] blackhole_netdev_xmit(): Dropping skb.
[  873.163546] blackhole_netdev_xmit(): Dropping skb.
[  873.163584] blackhole_netdev_xmit(): Dropping skb.