[    2.366778] ip (276) used greatest stack depth: 12336 bytes left
[    4.225835] ip (406) used greatest stack depth: 12320 bytes left
[  627.978373] ip (5292) used greatest stack depth: 12176 bytes left
[ 1103.874659] blackhole_netdev_xmit(): Dropping skb.
[ 1103.874736] blackhole_netdev_xmit(): Dropping skb.
[ 1103.874786] blackhole_netdev_xmit(): Dropping skb.
[ 1103.874829] blackhole_netdev_xmit(): Dropping skb.
[ 1172.656408] blackhole_netdev_xmit(): Dropping skb.
[ 1172.656466] blackhole_netdev_xmit(): Dropping skb.
[ 1172.656504] blackhole_netdev_xmit(): Dropping skb.
[ 1172.656546] blackhole_netdev_xmit(): Dropping skb.
[ 1237.432359] blackhole_netdev_xmit(): Dropping skb.
[ 1237.432421] blackhole_netdev_xmit(): Dropping skb.
[ 1237.432462] blackhole_netdev_xmit(): Dropping skb.
[ 1237.432519] blackhole_netdev_xmit(): Dropping skb.