[    2.764756] ip (276) used greatest stack depth: 12320 bytes left
[   21.486640] ip (2380) used greatest stack depth: 12160 bytes left
[  678.567956] blackhole_netdev_xmit(): Dropping skb.
[  678.568026] blackhole_netdev_xmit(): Dropping skb.
[  678.568068] blackhole_netdev_xmit(): Dropping skb.
[  678.568113] blackhole_netdev_xmit(): Dropping skb.
[  854.628586] blackhole_netdev_xmit(): Dropping skb.
[  854.628638] blackhole_netdev_xmit(): Dropping skb.
[  854.628672] blackhole_netdev_xmit(): Dropping skb.
[  854.628705] blackhole_netdev_xmit(): Dropping skb.
[  921.560944] blackhole_netdev_xmit(): Dropping skb.
[  921.561016] blackhole_netdev_xmit(): Dropping skb.
[  921.561064] blackhole_netdev_xmit(): Dropping skb.
[  921.561117] blackhole_netdev_xmit(): Dropping skb.
[  934.099662] blackhole_netdev_xmit(): Dropping skb.
[  934.099731] blackhole_netdev_xmit(): Dropping skb.
[  934.099773] blackhole_netdev_xmit(): Dropping skb.
[  934.099806] blackhole_netdev_xmit(): Dropping skb.