[    2.498204] ip (276) used greatest stack depth: 12360 bytes left
[    2.542007] ip (280) used greatest stack depth: 12344 bytes left
[   23.092858] ip (2221) used greatest stack depth: 12296 bytes left
[  741.280927] blackhole_netdev_xmit(): Dropping skb.
[  741.281002] blackhole_netdev_xmit(): Dropping skb.
[  741.281036] blackhole_netdev_xmit(): Dropping skb.
[  741.281067] blackhole_netdev_xmit(): Dropping skb.
[  836.820391] blackhole_netdev_xmit(): Dropping skb.
[  836.820450] blackhole_netdev_xmit(): Dropping skb.
[  836.820483] blackhole_netdev_xmit(): Dropping skb.
[  836.820518] blackhole_netdev_xmit(): Dropping skb.
[  951.756869] blackhole_netdev_xmit(): Dropping skb.
[  951.756938] blackhole_netdev_xmit(): Dropping skb.
[  951.756975] blackhole_netdev_xmit(): Dropping skb.
[  951.757009] blackhole_netdev_xmit(): Dropping skb.
[ 1209.899219] blackhole_netdev_xmit(): Dropping skb.
[ 1209.899280] blackhole_netdev_xmit(): Dropping skb.
[ 1209.899310] blackhole_netdev_xmit(): Dropping skb.
[ 1209.899337] blackhole_netdev_xmit(): Dropping skb.