[    2.403062] ip (276) used greatest stack depth: 12320 bytes left
[   15.113506] ip (1411) used greatest stack depth: 12272 bytes left
[  326.691494] ip (4166) used greatest stack depth: 12144 bytes left
[  803.487344] blackhole_netdev_xmit(): Dropping skb.
[  803.487403] blackhole_netdev_xmit(): Dropping skb.
[  803.487443] blackhole_netdev_xmit(): Dropping skb.
[  803.487476] blackhole_netdev_xmit(): Dropping skb.
[  838.046650] blackhole_netdev_xmit(): Dropping skb.
[  838.046705] blackhole_netdev_xmit(): Dropping skb.
[  838.046739] blackhole_netdev_xmit(): Dropping skb.
[  838.046775] blackhole_netdev_xmit(): Dropping skb.
[ 1007.734957] blackhole_netdev_xmit(): Dropping skb.
[ 1007.735025] blackhole_netdev_xmit(): Dropping skb.
[ 1007.735058] blackhole_netdev_xmit(): Dropping skb.
[ 1007.735097] blackhole_netdev_xmit(): Dropping skb.