[    1.970637] ip (248) used greatest stack depth: 12320 bytes left
[   15.805478] ip (1400) used greatest stack depth: 12064 bytes left
[  870.227022] blackhole_netdev_xmit(): Dropping skb.
[  870.227104] blackhole_netdev_xmit(): Dropping skb.
[  870.227150] blackhole_netdev_xmit(): Dropping skb.
[  870.227199] blackhole_netdev_xmit(): Dropping skb.
[  872.431969] blackhole_netdev_xmit(): Dropping skb.
[  872.432023] blackhole_netdev_xmit(): Dropping skb.
[  872.432060] blackhole_netdev_xmit(): Dropping skb.
[  872.432090] blackhole_netdev_xmit(): Dropping skb.
[  962.958825] blackhole_netdev_xmit(): Dropping skb.
[  962.958896] blackhole_netdev_xmit(): Dropping skb.
[  962.958935] blackhole_netdev_xmit(): Dropping skb.
[  962.958976] blackhole_netdev_xmit(): Dropping skb.
[ 1005.066754] blackhole_netdev_xmit(): Dropping skb.
[ 1005.066807] blackhole_netdev_xmit(): Dropping skb.
[ 1005.066839] blackhole_netdev_xmit(): Dropping skb.
[ 1005.066873] blackhole_netdev_xmit(): Dropping skb.
[ 1085.169687] blackhole_netdev_xmit(): Dropping skb.
[ 1085.169750] blackhole_netdev_xmit(): Dropping skb.
[ 1085.169789] blackhole_netdev_xmit(): Dropping skb.
[ 1085.169823] blackhole_netdev_xmit(): Dropping skb.