[    2.596416] ip (276) used greatest stack depth: 12368 bytes left
[    2.655158] ip (281) used greatest stack depth: 12352 bytes left
[   24.784258] ip (2341) used greatest stack depth: 12336 bytes left
[  985.342888] blackhole_netdev_xmit(): Dropping skb.
[  985.342959] blackhole_netdev_xmit(): Dropping skb.
[  985.342993] blackhole_netdev_xmit(): Dropping skb.
[  985.343027] blackhole_netdev_xmit(): Dropping skb.
[ 1194.227498] blackhole_netdev_xmit(): Dropping skb.
[ 1194.227580] blackhole_netdev_xmit(): Dropping skb.
[ 1194.227623] blackhole_netdev_xmit(): Dropping skb.
[ 1194.227676] blackhole_netdev_xmit(): Dropping skb.