[    2.146452] ip (275) used greatest stack depth: 12320 bytes left
[    9.417876] ip (1045) used greatest stack depth: 12304 bytes left
[  807.427675] blackhole_netdev_xmit(): Dropping skb.
[  807.427739] blackhole_netdev_xmit(): Dropping skb.
[  807.427774] blackhole_netdev_xmit(): Dropping skb.
[  807.427810] blackhole_netdev_xmit(): Dropping skb.
[  977.789073] blackhole_netdev_xmit(): Dropping skb.
[  977.789162] blackhole_netdev_xmit(): Dropping skb.
[  977.789198] blackhole_netdev_xmit(): Dropping skb.
[  977.789231] blackhole_netdev_xmit(): Dropping skb.
[ 1221.244720] blackhole_netdev_xmit(): Dropping skb.
[ 1221.244778] blackhole_netdev_xmit(): Dropping skb.
[ 1221.244816] blackhole_netdev_xmit(): Dropping skb.
[ 1221.244869] blackhole_netdev_xmit(): Dropping skb.