[    2.629851] ip (276) used greatest stack depth: 12360 bytes left
[    2.805979] ip (290) used greatest stack depth: 12344 bytes left
[    5.131172] ip (411) used greatest stack depth: 12328 bytes left
[   27.860088] ip (2498) used greatest stack depth: 12304 bytes left
[  948.806584] blackhole_netdev_xmit(): Dropping skb.
[  948.806651] blackhole_netdev_xmit(): Dropping skb.
[  948.806688] blackhole_netdev_xmit(): Dropping skb.
[  948.806723] blackhole_netdev_xmit(): Dropping skb.
[  993.332122] blackhole_netdev_xmit(): Dropping skb.
[  993.332182] blackhole_netdev_xmit(): Dropping skb.
[  993.332212] blackhole_netdev_xmit(): Dropping skb.
[  993.332244] blackhole_netdev_xmit(): Dropping skb.
[ 1010.736139] blackhole_netdev_xmit(): Dropping skb.
[ 1010.736201] blackhole_netdev_xmit(): Dropping skb.
[ 1010.736235] blackhole_netdev_xmit(): Dropping skb.
[ 1010.736267] blackhole_netdev_xmit(): Dropping skb.