[  846.174951] ip (20515) used greatest stack depth: 12272 bytes left
[  858.549741] blackhole_netdev_xmit(): Dropping skb.
[  858.549795] blackhole_netdev_xmit(): Dropping skb.
[  858.549821] blackhole_netdev_xmit(): Dropping skb.
[  858.549846] blackhole_netdev_xmit(): Dropping skb.
[  861.456320] blackhole_netdev_xmit(): Dropping skb.
[  861.456399] blackhole_netdev_xmit(): Dropping skb.
[  861.456444] blackhole_netdev_xmit(): Dropping skb.
[  861.456498] blackhole_netdev_xmit(): Dropping skb.
[ 1081.567638] blackhole_netdev_xmit(): Dropping skb.
[ 1081.567703] blackhole_netdev_xmit(): Dropping skb.
[ 1081.567747] blackhole_netdev_xmit(): Dropping skb.
[ 1081.567778] blackhole_netdev_xmit(): Dropping skb.