[    2.579512] ip (275) used greatest stack depth: 12320 bytes left
[  644.056906] ip (22745) used greatest stack depth: 12160 bytes left
[  900.657844] blackhole_netdev_xmit(): Dropping skb.
[  900.657921] blackhole_netdev_xmit(): Dropping skb.
[  900.657969] blackhole_netdev_xmit(): Dropping skb.
[  900.658021] blackhole_netdev_xmit(): Dropping skb.
[ 1083.596917] blackhole_netdev_xmit(): Dropping skb.
[ 1083.596979] blackhole_netdev_xmit(): Dropping skb.
[ 1083.597008] blackhole_netdev_xmit(): Dropping skb.
[ 1083.597039] blackhole_netdev_xmit(): Dropping skb.
[ 1246.372484] blackhole_netdev_xmit(): Dropping skb.
[ 1246.372541] blackhole_netdev_xmit(): Dropping skb.
[ 1246.372579] blackhole_netdev_xmit(): Dropping skb.
[ 1246.372622] blackhole_netdev_xmit(): Dropping skb.