[    2.237576] ip (273) used greatest stack depth: 12320 bytes left
[   16.102848] ip (2139) used greatest stack depth: 12192 bytes left
[  647.741526] blackhole_netdev_xmit(): Dropping skb.
[  647.741586] blackhole_netdev_xmit(): Dropping skb.
[  647.741624] blackhole_netdev_xmit(): Dropping skb.
[  647.741653] blackhole_netdev_xmit(): Dropping skb.
[  711.131700] blackhole_netdev_xmit(): Dropping skb.
[  711.131761] blackhole_netdev_xmit(): Dropping skb.
[  711.131797] blackhole_netdev_xmit(): Dropping skb.
[  711.131834] blackhole_netdev_xmit(): Dropping skb.
[  777.183135] blackhole_netdev_xmit(): Dropping skb.
[  777.183183] blackhole_netdev_xmit(): Dropping skb.
[  777.183213] blackhole_netdev_xmit(): Dropping skb.
[  777.183238] blackhole_netdev_xmit(): Dropping skb.
[ 1230.674380] blackhole_netdev_xmit(): Dropping skb.
[ 1230.674449] blackhole_netdev_xmit(): Dropping skb.
[ 1230.674485] blackhole_netdev_xmit(): Dropping skb.
[ 1230.674525] blackhole_netdev_xmit(): Dropping skb.