[    2.600731] ip (282) used greatest stack depth: 12328 bytes left
[    9.430738] ip (792) used greatest stack depth: 12048 bytes left
[  891.699741] blackhole_netdev_xmit(): Dropping skb.
[  891.699799] blackhole_netdev_xmit(): Dropping skb.
[  891.699831] blackhole_netdev_xmit(): Dropping skb.
[  891.699863] blackhole_netdev_xmit(): Dropping skb.
[ 1155.549615] blackhole_netdev_xmit(): Dropping skb.
[ 1155.549701] blackhole_netdev_xmit(): Dropping skb.
[ 1155.549738] blackhole_netdev_xmit(): Dropping skb.
[ 1155.549776] blackhole_netdev_xmit(): Dropping skb.