[    1.696336] ip (245) used greatest stack depth: 12304 bytes left
[    6.968775] ip (787) used greatest stack depth: 12176 bytes left
[    9.969859] ip (1186) used greatest stack depth: 12144 bytes left
[  860.268785] blackhole_netdev_xmit(): Dropping skb.
[  860.268857] blackhole_netdev_xmit(): Dropping skb.
[  860.268892] blackhole_netdev_xmit(): Dropping skb.
[  860.268928] blackhole_netdev_xmit(): Dropping skb.
[  954.859779] blackhole_netdev_xmit(): Dropping skb.
[  954.859870] blackhole_netdev_xmit(): Dropping skb.
[  954.859929] blackhole_netdev_xmit(): Dropping skb.
[  954.859997] blackhole_netdev_xmit(): Dropping skb.
[ 1084.021315] blackhole_netdev_xmit(): Dropping skb.
[ 1084.021366] blackhole_netdev_xmit(): Dropping skb.
[ 1084.021398] blackhole_netdev_xmit(): Dropping skb.
[ 1084.021428] blackhole_netdev_xmit(): Dropping skb.