[    2.584398] ip (277) used greatest stack depth: 12336 bytes left
[  637.658811] ip (6753) used greatest stack depth: 12192 bytes left
[  671.961551] blackhole_netdev_xmit(): Dropping skb.
[  671.961603] blackhole_netdev_xmit(): Dropping skb.
[  671.961632] blackhole_netdev_xmit(): Dropping skb.
[  671.961658] blackhole_netdev_xmit(): Dropping skb.
[  868.225980] blackhole_netdev_xmit(): Dropping skb.
[  868.226057] blackhole_netdev_xmit(): Dropping skb.
[  868.226107] blackhole_netdev_xmit(): Dropping skb.
[  868.226156] blackhole_netdev_xmit(): Dropping skb.
[ 1039.717119] blackhole_netdev_xmit(): Dropping skb.
[ 1039.717185] blackhole_netdev_xmit(): Dropping skb.
[ 1039.717217] blackhole_netdev_xmit(): Dropping skb.
[ 1039.717250] blackhole_netdev_xmit(): Dropping skb.
[ 1085.738867] blackhole_netdev_xmit(): Dropping skb.
[ 1085.738929] blackhole_netdev_xmit(): Dropping skb.
[ 1085.738967] blackhole_netdev_xmit(): Dropping skb.
[ 1085.739015] blackhole_netdev_xmit(): Dropping skb.