[    2.152987] ip (275) used greatest stack depth: 12320 bytes left
[  636.568514] ip (19143) used greatest stack depth: 12304 bytes left
[  773.054611] blackhole_netdev_xmit(): Dropping skb.
[  773.054661] blackhole_netdev_xmit(): Dropping skb.
[  773.054691] blackhole_netdev_xmit(): Dropping skb.
[  773.054722] blackhole_netdev_xmit(): Dropping skb.
[ 1046.692635] blackhole_netdev_xmit(): Dropping skb.
[ 1046.692694] blackhole_netdev_xmit(): Dropping skb.
[ 1046.692725] blackhole_netdev_xmit(): Dropping skb.
[ 1046.692756] blackhole_netdev_xmit(): Dropping skb.
[ 1146.845808] blackhole_netdev_xmit(): Dropping skb.
[ 1146.845861] blackhole_netdev_xmit(): Dropping skb.
[ 1146.845896] blackhole_netdev_xmit(): Dropping skb.
[ 1146.845933] blackhole_netdev_xmit(): Dropping skb.