[    1.879470] ip (243) used greatest stack depth: 12352 bytes left
[    2.395591] ip (277) used greatest stack depth: 12320 bytes left
[   22.117098] ip (2576) used greatest stack depth: 12304 bytes left
[  630.070901] ip (8061) used greatest stack depth: 12272 bytes left
[  634.451400] ip (8876) used greatest stack depth: 12048 bytes left
[  693.022271] blackhole_netdev_xmit(): Dropping skb.
[  693.022341] blackhole_netdev_xmit(): Dropping skb.
[  693.022387] blackhole_netdev_xmit(): Dropping skb.
[  693.022431] blackhole_netdev_xmit(): Dropping skb.
[  721.804315] blackhole_netdev_xmit(): Dropping skb.
[  721.804381] blackhole_netdev_xmit(): Dropping skb.
[  721.804413] blackhole_netdev_xmit(): Dropping skb.
[  721.804453] blackhole_netdev_xmit(): Dropping skb.
[  738.107841] blackhole_netdev_xmit(): Dropping skb.
[  738.107910] blackhole_netdev_xmit(): Dropping skb.
[  738.107957] blackhole_netdev_xmit(): Dropping skb.
[  738.108004] blackhole_netdev_xmit(): Dropping skb.
[  845.208184] blackhole_netdev_xmit(): Dropping skb.
[  845.208243] blackhole_netdev_xmit(): Dropping skb.
[  845.208286] blackhole_netdev_xmit(): Dropping skb.
[  845.208324] blackhole_netdev_xmit(): Dropping skb.
[  989.442211] blackhole_netdev_xmit(): Dropping skb.
[  989.442271] blackhole_netdev_xmit(): Dropping skb.
[  989.442300] blackhole_netdev_xmit(): Dropping skb.
[  989.442334] blackhole_netdev_xmit(): Dropping skb.