[    2.035425] ip (240) used greatest stack depth: 12368 bytes left
[    2.710703] ip (274) used greatest stack depth: 12336 bytes left
[   21.914633] ip (2148) used greatest stack depth: 12176 bytes left
[  632.874029] ip (9742) used greatest stack depth: 12064 bytes left
[  665.545171] blackhole_netdev_xmit(): Dropping skb.
[  665.545240] blackhole_netdev_xmit(): Dropping skb.
[  665.545275] blackhole_netdev_xmit(): Dropping skb.
[  665.545319] blackhole_netdev_xmit(): Dropping skb.
[  720.691493] hrtimer: interrupt took 10816322 ns
[  972.528287] blackhole_netdev_xmit(): Dropping skb.
[  972.528369] blackhole_netdev_xmit(): Dropping skb.
[  972.528422] blackhole_netdev_xmit(): Dropping skb.
[  972.528480] blackhole_netdev_xmit(): Dropping skb.
[ 1066.717939] blackhole_netdev_xmit(): Dropping skb.
[ 1066.718002] blackhole_netdev_xmit(): Dropping skb.
[ 1066.718038] blackhole_netdev_xmit(): Dropping skb.
[ 1066.718071] blackhole_netdev_xmit(): Dropping skb.