[    2.570594] ip (272) used greatest stack depth: 12344 bytes left
[   12.698207] ip (1136) used greatest stack depth: 12328 bytes left
[   25.438756] ip (2501) used greatest stack depth: 12216 bytes left
[  328.180434] ip (1526) used greatest stack depth: 12056 bytes left
[  772.089759] blackhole_netdev_xmit(): Dropping skb.
[  772.089824] blackhole_netdev_xmit(): Dropping skb.
[  772.089856] blackhole_netdev_xmit(): Dropping skb.
[  772.089901] blackhole_netdev_xmit(): Dropping skb.
[  921.785918] blackhole_netdev_xmit(): Dropping skb.
[  921.785979] blackhole_netdev_xmit(): Dropping skb.
[  921.786019] blackhole_netdev_xmit(): Dropping skb.
[  921.786056] blackhole_netdev_xmit(): Dropping skb.
[ 1026.669791] blackhole_netdev_xmit(): Dropping skb.
[ 1026.669845] blackhole_netdev_xmit(): Dropping skb.
[ 1026.669882] blackhole_netdev_xmit(): Dropping skb.
[ 1026.669921] blackhole_netdev_xmit(): Dropping skb.