[    2.291659] ip (273) used greatest stack depth: 12344 bytes left
[    6.455223] ip (615) used greatest stack depth: 12328 bytes left
[  627.214543] ip (5726) used greatest stack depth: 12296 bytes left
[  690.411104] blackhole_netdev_xmit(): Dropping skb.
[  690.411163] blackhole_netdev_xmit(): Dropping skb.
[  690.411200] blackhole_netdev_xmit(): Dropping skb.
[  690.411235] blackhole_netdev_xmit(): Dropping skb.
[  717.758877] blackhole_netdev_xmit(): Dropping skb.
[  717.758947] blackhole_netdev_xmit(): Dropping skb.
[  717.758988] blackhole_netdev_xmit(): Dropping skb.
[  717.759034] blackhole_netdev_xmit(): Dropping skb.
[  750.223514] blackhole_netdev_xmit(): Dropping skb.
[  750.223592] blackhole_netdev_xmit(): Dropping skb.
[  750.223634] blackhole_netdev_xmit(): Dropping skb.
[  750.223681] blackhole_netdev_xmit(): Dropping skb.
[  846.457471] blackhole_netdev_xmit(): Dropping skb.
[  846.457535] blackhole_netdev_xmit(): Dropping skb.
[  846.457579] blackhole_netdev_xmit(): Dropping skb.
[  846.457621] blackhole_netdev_xmit(): Dropping skb.