[    2.584043] ip (277) used greatest stack depth: 12352 bytes left
[   12.189345] ip (961) used greatest stack depth: 12200 bytes left
[  788.578954] blackhole_netdev_xmit(): Dropping skb.
[  788.579025] blackhole_netdev_xmit(): Dropping skb.
[  788.579081] blackhole_netdev_xmit(): Dropping skb.
[  788.579139] blackhole_netdev_xmit(): Dropping skb.
[ 1221.448030] blackhole_netdev_xmit(): Dropping skb.
[ 1221.448100] blackhole_netdev_xmit(): Dropping skb.
[ 1221.448131] blackhole_netdev_xmit(): Dropping skb.
[ 1221.448164] blackhole_netdev_xmit(): Dropping skb.