[    2.178462] ip (275) used greatest stack depth: 12320 bytes left
[    2.333797] ip (289) used greatest stack depth: 12272 bytes left
[    9.040949] ip (946) used greatest stack depth: 12032 bytes left
[  819.702593] blackhole_netdev_xmit(): Dropping skb.
[  819.702658] blackhole_netdev_xmit(): Dropping skb.
[  819.702692] blackhole_netdev_xmit(): Dropping skb.
[  819.702726] blackhole_netdev_xmit(): Dropping skb.
[  982.047319] blackhole_netdev_xmit(): Dropping skb.
[  982.047402] blackhole_netdev_xmit(): Dropping skb.
[  982.047453] blackhole_netdev_xmit(): Dropping skb.
[  982.047498] blackhole_netdev_xmit(): Dropping skb.
[ 1019.058808] blackhole_netdev_xmit(): Dropping skb.
[ 1019.058886] blackhole_netdev_xmit(): Dropping skb.
[ 1019.058937] blackhole_netdev_xmit(): Dropping skb.
[ 1019.058998] blackhole_netdev_xmit(): Dropping skb.