[    3.450135] ip (276) used greatest stack depth: 12320 bytes left
[  835.628229] blackhole_netdev_xmit(): Dropping skb.
[  835.628400] blackhole_netdev_xmit(): Dropping skb.
[  835.628443] blackhole_netdev_xmit(): Dropping skb.
[  835.628495] blackhole_netdev_xmit(): Dropping skb.
[  980.865612] blackhole_netdev_xmit(): Dropping skb.
[  980.865681] blackhole_netdev_xmit(): Dropping skb.
[  980.865722] blackhole_netdev_xmit(): Dropping skb.
[  980.865763] blackhole_netdev_xmit(): Dropping skb.
[ 1015.069480] blackhole_netdev_xmit(): Dropping skb.
[ 1015.069548] blackhole_netdev_xmit(): Dropping skb.
[ 1015.069582] blackhole_netdev_xmit(): Dropping skb.
[ 1015.069613] blackhole_netdev_xmit(): Dropping skb.