[    2.206405] ip (275) used greatest stack depth: 12320 bytes left
[    4.717398] ip (410) used greatest stack depth: 12304 bytes left
[  633.506974] ip (5770) used greatest stack depth: 12176 bytes left
[  663.859200] blackhole_netdev_xmit(): Dropping skb.
[  663.859254] blackhole_netdev_xmit(): Dropping skb.
[  663.859291] blackhole_netdev_xmit(): Dropping skb.
[  663.859330] blackhole_netdev_xmit(): Dropping skb.
[  678.827785] blackhole_netdev_xmit(): Dropping skb.
[  678.827844] blackhole_netdev_xmit(): Dropping skb.
[  678.827877] blackhole_netdev_xmit(): Dropping skb.
[  678.827912] blackhole_netdev_xmit(): Dropping skb.
[  836.717791] blackhole_netdev_xmit(): Dropping skb.
[  836.717863] blackhole_netdev_xmit(): Dropping skb.
[  836.717911] blackhole_netdev_xmit(): Dropping skb.
[  836.717963] blackhole_netdev_xmit(): Dropping skb.
[  867.317350] blackhole_netdev_xmit(): Dropping skb.
[  867.317416] blackhole_netdev_xmit(): Dropping skb.
[  867.317453] blackhole_netdev_xmit(): Dropping skb.
[  867.317486] blackhole_netdev_xmit(): Dropping skb.
[ 1016.589341] blackhole_netdev_xmit(): Dropping skb.
[ 1016.589405] blackhole_netdev_xmit(): Dropping skb.
[ 1016.589440] blackhole_netdev_xmit(): Dropping skb.
[ 1016.589483] blackhole_netdev_xmit(): Dropping skb.
[ 1025.330957] blackhole_netdev_xmit(): Dropping skb.
[ 1025.331017] blackhole_netdev_xmit(): Dropping skb.
[ 1025.331053] blackhole_netdev_xmit(): Dropping skb.
[ 1025.331094] blackhole_netdev_xmit(): Dropping skb.