[    1.801646] ip (242) used greatest stack depth: 12384 bytes left
[    2.449368] ip (276) used greatest stack depth: 12368 bytes left
[    2.643537] ip (290) used greatest stack depth: 12352 bytes left
[   28.645766] ip (2616) used greatest stack depth: 12200 bytes left
[ 1059.206396] blackhole_netdev_xmit(): Dropping skb.
[ 1059.206475] blackhole_netdev_xmit(): Dropping skb.
[ 1059.206515] blackhole_netdev_xmit(): Dropping skb.
[ 1059.206560] blackhole_netdev_xmit(): Dropping skb.
[ 1243.150833] blackhole_netdev_xmit(): Dropping skb.
[ 1243.150887] blackhole_netdev_xmit(): Dropping skb.
[ 1243.150918] blackhole_netdev_xmit(): Dropping skb.
[ 1243.150952] blackhole_netdev_xmit(): Dropping skb.
[ 1247.492880] blackhole_netdev_xmit(): Dropping skb.
[ 1247.492932] blackhole_netdev_xmit(): Dropping skb.
[ 1247.492962] blackhole_netdev_xmit(): Dropping skb.
[ 1247.492989] blackhole_netdev_xmit(): Dropping skb.