[    2.750678] ip (274) used greatest stack depth: 12344 bytes left
[   14.292135] ip (1169) used greatest stack depth: 12296 bytes left
[  642.788393] ip (7273) used greatest stack depth: 12184 bytes left
[  683.776216] blackhole_netdev_xmit(): Dropping skb.
[  683.776284] blackhole_netdev_xmit(): Dropping skb.
[  683.776325] blackhole_netdev_xmit(): Dropping skb.
[  683.776364] blackhole_netdev_xmit(): Dropping skb.
[  793.648930] blackhole_netdev_xmit(): Dropping skb.
[  793.649005] blackhole_netdev_xmit(): Dropping skb.
[  793.649060] blackhole_netdev_xmit(): Dropping skb.
[  793.649108] blackhole_netdev_xmit(): Dropping skb.
[ 1047.675808] blackhole_netdev_xmit(): Dropping skb.
[ 1047.675864] blackhole_netdev_xmit(): Dropping skb.
[ 1047.675899] blackhole_netdev_xmit(): Dropping skb.
[ 1047.675944] blackhole_netdev_xmit(): Dropping skb.