[    1.948586] ip (244) used greatest stack depth: 12360 bytes left
[    2.481755] ip (278) used greatest stack depth: 12344 bytes left
[    2.527868] ip (282) used greatest stack depth: 12328 bytes left
[   15.316156] ip (1412) used greatest stack depth: 12176 bytes left
[  709.568187] blackhole_netdev_xmit(): Dropping skb.
[  709.568255] blackhole_netdev_xmit(): Dropping skb.
[  709.568309] blackhole_netdev_xmit(): Dropping skb.
[  709.568368] blackhole_netdev_xmit(): Dropping skb.
[  730.713954] blackhole_netdev_xmit(): Dropping skb.
[  730.714011] blackhole_netdev_xmit(): Dropping skb.
[  730.714044] blackhole_netdev_xmit(): Dropping skb.
[  730.714076] blackhole_netdev_xmit(): Dropping skb.
[  740.148887] blackhole_netdev_xmit(): Dropping skb.
[  740.148969] blackhole_netdev_xmit(): Dropping skb.
[  740.149015] blackhole_netdev_xmit(): Dropping skb.
[  740.149062] blackhole_netdev_xmit(): Dropping skb.
[ 1169.234848] blackhole_netdev_xmit(): Dropping skb.
[ 1169.234925] blackhole_netdev_xmit(): Dropping skb.
[ 1169.234956] blackhole_netdev_xmit(): Dropping skb.
[ 1169.234990] blackhole_netdev_xmit(): Dropping skb.