[    3.211708] ip (276) used greatest stack depth: 12320 bytes left
[   19.803638] ip (2366) used greatest stack depth: 12160 bytes left
[  829.584270] blackhole_netdev_xmit(): Dropping skb.
[  829.584328] blackhole_netdev_xmit(): Dropping skb.
[  829.584358] blackhole_netdev_xmit(): Dropping skb.
[  829.584384] blackhole_netdev_xmit(): Dropping skb.
[  840.736675] blackhole_netdev_xmit(): Dropping skb.
[  840.736740] blackhole_netdev_xmit(): Dropping skb.
[  840.736780] blackhole_netdev_xmit(): Dropping skb.
[  840.736823] blackhole_netdev_xmit(): Dropping skb.
[  873.246265] blackhole_netdev_xmit(): Dropping skb.
[  873.246324] blackhole_netdev_xmit(): Dropping skb.
[  873.246360] blackhole_netdev_xmit(): Dropping skb.
[  873.246388] blackhole_netdev_xmit(): Dropping skb.
[  915.955560] blackhole_netdev_xmit(): Dropping skb.
[  915.955715] blackhole_netdev_xmit(): Dropping skb.
[  915.955764] blackhole_netdev_xmit(): Dropping skb.
[  915.955826] blackhole_netdev_xmit(): Dropping skb.