[    2.807783] ip (275) used greatest stack depth: 12320 bytes left
[   11.306273] ip (917) used greatest stack depth: 12304 bytes left
[  637.439387] ip (19584) used greatest stack depth: 12272 bytes left
[  779.121175] blackhole_netdev_xmit(): Dropping skb.
[  779.121263] blackhole_netdev_xmit(): Dropping skb.
[  779.121300] blackhole_netdev_xmit(): Dropping skb.
[  779.121338] blackhole_netdev_xmit(): Dropping skb.
[  793.508279] blackhole_netdev_xmit(): Dropping skb.
[  793.508330] blackhole_netdev_xmit(): Dropping skb.
[  793.508362] blackhole_netdev_xmit(): Dropping skb.
[  793.508394] blackhole_netdev_xmit(): Dropping skb.