[    1.630817] ip (246) used greatest stack depth: 12352 bytes left
[    2.048136] ip (277) used greatest stack depth: 12320 bytes left
[    5.200629] ip (446) used greatest stack depth: 12272 bytes left
[    9.124146] ip (952) used greatest stack depth: 12032 bytes left
[  643.617122] blackhole_netdev_xmit(): Dropping skb.
[  643.617191] blackhole_netdev_xmit(): Dropping skb.
[  643.617226] blackhole_netdev_xmit(): Dropping skb.
[  643.617258] blackhole_netdev_xmit(): Dropping skb.
[  665.843097] blackhole_netdev_xmit(): Dropping skb.
[  665.843159] blackhole_netdev_xmit(): Dropping skb.
[  665.843201] blackhole_netdev_xmit(): Dropping skb.
[  665.843237] blackhole_netdev_xmit(): Dropping skb.
[  676.644295] blackhole_netdev_xmit(): Dropping skb.
[  676.644353] blackhole_netdev_xmit(): Dropping skb.
[  676.644390] blackhole_netdev_xmit(): Dropping skb.
[  676.644424] blackhole_netdev_xmit(): Dropping skb.
[  730.274762] blackhole_netdev_xmit(): Dropping skb.
[  730.274825] blackhole_netdev_xmit(): Dropping skb.
[  730.274881] blackhole_netdev_xmit(): Dropping skb.
[  730.274935] blackhole_netdev_xmit(): Dropping skb.