[    1.728917] ip (244) used greatest stack depth: 12384 bytes left
[    2.295492] ip (278) used greatest stack depth: 12368 bytes left
[    2.340192] ip (282) used greatest stack depth: 12352 bytes left
[  944.624175] blackhole_netdev_xmit(): Dropping skb.
[  944.624263] blackhole_netdev_xmit(): Dropping skb.
[  944.624310] blackhole_netdev_xmit(): Dropping skb.
[  944.624366] blackhole_netdev_xmit(): Dropping skb.
[ 1214.064724] blackhole_netdev_xmit(): Dropping skb.
[ 1214.064817] blackhole_netdev_xmit(): Dropping skb.
[ 1214.064860] blackhole_netdev_xmit(): Dropping skb.
[ 1214.064900] blackhole_netdev_xmit(): Dropping skb.