[    1.692216] ip (243) used greatest stack depth: 12352 bytes left
[    2.095310] ip (277) used greatest stack depth: 12320 bytes left
[    4.207654] ip (407) used greatest stack depth: 12304 bytes left
[  321.566955] ip (4990) used greatest stack depth: 12272 bytes left
[  636.634147] ip (5807) used greatest stack depth: 12224 bytes left
[  758.363982] blackhole_netdev_xmit(): Dropping skb.
[  758.364038] blackhole_netdev_xmit(): Dropping skb.
[  758.364075] blackhole_netdev_xmit(): Dropping skb.
[  758.364103] blackhole_netdev_xmit(): Dropping skb.
[  885.116661] blackhole_netdev_xmit(): Dropping skb.
[  885.116722] blackhole_netdev_xmit(): Dropping skb.
[  885.116757] blackhole_netdev_xmit(): Dropping skb.
[  885.116791] blackhole_netdev_xmit(): Dropping skb.
[ 1001.193146] blackhole_netdev_xmit(): Dropping skb.
[ 1001.193251] blackhole_netdev_xmit(): Dropping skb.
[ 1001.193307] blackhole_netdev_xmit(): Dropping skb.
[ 1001.193372] blackhole_netdev_xmit(): Dropping skb.