[    1.853809] ip (242) used greatest stack depth: 12352 bytes left
[    1.909214] ip (248) used greatest stack depth: 12304 bytes left
[  630.576644] ip (11075) used greatest stack depth: 12272 bytes left
[  748.737110] blackhole_netdev_xmit(): Dropping skb.
[  748.737162] blackhole_netdev_xmit(): Dropping skb.
[  748.737195] blackhole_netdev_xmit(): Dropping skb.
[  748.737231] blackhole_netdev_xmit(): Dropping skb.
[  759.694679] blackhole_netdev_xmit(): Dropping skb.
[  759.694742] blackhole_netdev_xmit(): Dropping skb.
[  759.694777] blackhole_netdev_xmit(): Dropping skb.
[  759.694808] blackhole_netdev_xmit(): Dropping skb.
[  838.316332] blackhole_netdev_xmit(): Dropping skb.
[  838.316390] blackhole_netdev_xmit(): Dropping skb.
[  838.316443] blackhole_netdev_xmit(): Dropping skb.
[  838.316488] blackhole_netdev_xmit(): Dropping skb.
[ 1154.624503] blackhole_netdev_xmit(): Dropping skb.
[ 1154.624574] blackhole_netdev_xmit(): Dropping skb.
[ 1154.624623] blackhole_netdev_xmit(): Dropping skb.
[ 1154.624667] blackhole_netdev_xmit(): Dropping skb.