[    2.681412] ip (275) used greatest stack depth: 12320 bytes left
[   12.783021] ip (1084) used greatest stack depth: 12272 bytes left
[  750.090230] blackhole_netdev_xmit(): Dropping skb.
[  750.090312] blackhole_netdev_xmit(): Dropping skb.
[  750.090357] blackhole_netdev_xmit(): Dropping skb.
[  750.090397] blackhole_netdev_xmit(): Dropping skb.
[ 1192.499118] blackhole_netdev_xmit(): Dropping skb.
[ 1192.499190] blackhole_netdev_xmit(): Dropping skb.
[ 1192.499234] blackhole_netdev_xmit(): Dropping skb.
[ 1192.499295] blackhole_netdev_xmit(): Dropping skb.