[    2.110651] ip (276) used greatest stack depth: 12320 bytes left
[    8.406860] ip (950) used greatest stack depth: 12144 bytes left
[  622.509815] ip (12526) used greatest stack depth: 12128 bytes left
[  647.069959] blackhole_netdev_xmit(): Dropping skb.
[  647.070019] blackhole_netdev_xmit(): Dropping skb.
[  647.070069] blackhole_netdev_xmit(): Dropping skb.
[  647.070111] blackhole_netdev_xmit(): Dropping skb.
[  697.051813] blackhole_netdev_xmit(): Dropping skb.
[  697.051883] blackhole_netdev_xmit(): Dropping skb.
[  697.051934] blackhole_netdev_xmit(): Dropping skb.
[  697.051979] blackhole_netdev_xmit(): Dropping skb.
[ 1060.371966] blackhole_netdev_xmit(): Dropping skb.
[ 1060.372039] blackhole_netdev_xmit(): Dropping skb.
[ 1060.372079] blackhole_netdev_xmit(): Dropping skb.
[ 1060.372114] blackhole_netdev_xmit(): Dropping skb.
[ 1085.538690] blackhole_netdev_xmit(): Dropping skb.
[ 1085.538753] blackhole_netdev_xmit(): Dropping skb.
[ 1085.538790] blackhole_netdev_xmit(): Dropping skb.
[ 1085.538831] blackhole_netdev_xmit(): Dropping skb.