[    2.548637] ip (273) used greatest stack depth: 12320 bytes left
[   18.828954] ip (2147) used greatest stack depth: 12272 bytes left
[   25.274339] ip (2614) used greatest stack depth: 12048 bytes left
[  845.596738] blackhole_netdev_xmit(): Dropping skb.
[  845.596846] blackhole_netdev_xmit(): Dropping skb.
[  845.596880] blackhole_netdev_xmit(): Dropping skb.
[  845.596913] blackhole_netdev_xmit(): Dropping skb.
[  851.110439] blackhole_netdev_xmit(): Dropping skb.
[  851.110504] blackhole_netdev_xmit(): Dropping skb.
[  851.110540] blackhole_netdev_xmit(): Dropping skb.
[  851.110578] blackhole_netdev_xmit(): Dropping skb.
[ 1151.582834] blackhole_netdev_xmit(): Dropping skb.
[ 1151.582897] blackhole_netdev_xmit(): Dropping skb.
[ 1151.582928] blackhole_netdev_xmit(): Dropping skb.
[ 1151.582961] blackhole_netdev_xmit(): Dropping skb.
[ 1154.044067] blackhole_netdev_xmit(): Dropping skb.
[ 1154.044121] blackhole_netdev_xmit(): Dropping skb.
[ 1154.044153] blackhole_netdev_xmit(): Dropping skb.
[ 1154.044187] blackhole_netdev_xmit(): Dropping skb.