[    1.785676] ip (242) used greatest stack depth: 12352 bytes left
[    1.837829] ip (248) used greatest stack depth: 12304 bytes left
[  639.350156] ip (15937) used greatest stack depth: 12176 bytes left
[  858.810219] blackhole_netdev_xmit(): Dropping skb.
[  858.810277] blackhole_netdev_xmit(): Dropping skb.
[  858.810311] blackhole_netdev_xmit(): Dropping skb.
[  858.810343] blackhole_netdev_xmit(): Dropping skb.
[ 1092.528633] blackhole_netdev_xmit(): Dropping skb.
[ 1092.528721] blackhole_netdev_xmit(): Dropping skb.
[ 1092.528763] blackhole_netdev_xmit(): Dropping skb.
[ 1092.528804] blackhole_netdev_xmit(): Dropping skb.
[ 1157.053354] blackhole_netdev_xmit(): Dropping skb.
[ 1157.053424] blackhole_netdev_xmit(): Dropping skb.
[ 1157.053470] blackhole_netdev_xmit(): Dropping skb.
[ 1157.053512] blackhole_netdev_xmit(): Dropping skb.