[    1.835149] ip (241) used greatest stack depth: 12352 bytes left
[    2.306022] ip (275) used greatest stack depth: 12320 bytes left
[    2.345724] ip (279) used greatest stack depth: 12272 bytes left
[  879.374516] blackhole_netdev_xmit(): Dropping skb.
[  879.374603] blackhole_netdev_xmit(): Dropping skb.
[  879.374643] blackhole_netdev_xmit(): Dropping skb.
[  879.374677] blackhole_netdev_xmit(): Dropping skb.
[  975.791312] blackhole_netdev_xmit(): Dropping skb.
[  975.791377] blackhole_netdev_xmit(): Dropping skb.
[  975.791408] blackhole_netdev_xmit(): Dropping skb.
[  975.791440] blackhole_netdev_xmit(): Dropping skb.
[  992.148346] blackhole_netdev_xmit(): Dropping skb.
[  992.148399] blackhole_netdev_xmit(): Dropping skb.
[  992.148430] blackhole_netdev_xmit(): Dropping skb.
[  992.148456] blackhole_netdev_xmit(): Dropping skb.