[    2.437539] ip (275) used greatest stack depth: 12320 bytes left
[   26.793636] ip (2507) used greatest stack depth: 12160 bytes left
[  684.357514] blackhole_netdev_xmit(): Dropping skb.
[  684.357578] blackhole_netdev_xmit(): Dropping skb.
[  684.357611] blackhole_netdev_xmit(): Dropping skb.
[  684.357645] blackhole_netdev_xmit(): Dropping skb.
[ 1008.364344] blackhole_netdev_xmit(): Dropping skb.
[ 1008.364414] blackhole_netdev_xmit(): Dropping skb.
[ 1008.364443] blackhole_netdev_xmit(): Dropping skb.
[ 1008.364470] blackhole_netdev_xmit(): Dropping skb.