[    1.757936] ip (241) used greatest stack depth: 12304 bytes left
[   16.234901] ip (2135) used greatest stack depth: 12272 bytes left
[  650.664110] blackhole_netdev_xmit(): Dropping skb.
[  650.664171] blackhole_netdev_xmit(): Dropping skb.
[  650.664201] blackhole_netdev_xmit(): Dropping skb.
[  650.664231] blackhole_netdev_xmit(): Dropping skb.
[  728.158346] blackhole_netdev_xmit(): Dropping skb.
[  728.158403] blackhole_netdev_xmit(): Dropping skb.
[  728.158435] blackhole_netdev_xmit(): Dropping skb.
[  728.158480] blackhole_netdev_xmit(): Dropping skb.
[  913.114935] blackhole_netdev_xmit(): Dropping skb.
[  913.114993] blackhole_netdev_xmit(): Dropping skb.
[  913.115023] blackhole_netdev_xmit(): Dropping skb.
[  913.115056] blackhole_netdev_xmit(): Dropping skb.