[    2.178344] ip (275) used greatest stack depth: 12320 bytes left
[  636.981283] ip (17243) used greatest stack depth: 12160 bytes left
[  648.587882] blackhole_netdev_xmit(): Dropping skb.
[  648.587944] blackhole_netdev_xmit(): Dropping skb.
[  648.587994] blackhole_netdev_xmit(): Dropping skb.
[  648.588045] blackhole_netdev_xmit(): Dropping skb.
[  796.088449] blackhole_netdev_xmit(): Dropping skb.
[  796.088502] blackhole_netdev_xmit(): Dropping skb.
[  796.088534] blackhole_netdev_xmit(): Dropping skb.
[  796.088561] blackhole_netdev_xmit(): Dropping skb.
[  943.478612] blackhole_netdev_xmit(): Dropping skb.
[  943.478675] blackhole_netdev_xmit(): Dropping skb.
[  943.478706] blackhole_netdev_xmit(): Dropping skb.
[  943.478739] blackhole_netdev_xmit(): Dropping skb.