[    1.738655] ip (241) used greatest stack depth: 12352 bytes left
[    2.155825] ip (275) used greatest stack depth: 12320 bytes left
[  322.442745] ip (3957) used greatest stack depth: 12272 bytes left
[ 1019.427566] blackhole_netdev_xmit(): Dropping skb.
[ 1019.427640] blackhole_netdev_xmit(): Dropping skb.
[ 1019.427683] blackhole_netdev_xmit(): Dropping skb.
[ 1019.427730] blackhole_netdev_xmit(): Dropping skb.
[ 1176.539061] blackhole_netdev_xmit(): Dropping skb.
[ 1176.539114] blackhole_netdev_xmit(): Dropping skb.
[ 1176.539151] blackhole_netdev_xmit(): Dropping skb.
[ 1176.539186] blackhole_netdev_xmit(): Dropping skb.