[    1.781383] ip (241) used greatest stack depth: 12352 bytes left
[    2.250179] ip (275) used greatest stack depth: 12320 bytes left
[  636.943103] ip (15413) used greatest stack depth: 12304 bytes left
[  735.911333] blackhole_netdev_xmit(): Dropping skb.
[  735.911385] blackhole_netdev_xmit(): Dropping skb.
[  735.911421] blackhole_netdev_xmit(): Dropping skb.
[  735.911460] blackhole_netdev_xmit(): Dropping skb.
[  791.086571] blackhole_netdev_xmit(): Dropping skb.
[  791.086626] blackhole_netdev_xmit(): Dropping skb.
[  791.086664] blackhole_netdev_xmit(): Dropping skb.
[  791.086705] blackhole_netdev_xmit(): Dropping skb.
[  829.716332] blackhole_netdev_xmit(): Dropping skb.
[  829.716387] blackhole_netdev_xmit(): Dropping skb.
[  829.716433] blackhole_netdev_xmit(): Dropping skb.
[  829.716479] blackhole_netdev_xmit(): Dropping skb.
[ 1146.579408] blackhole_netdev_xmit(): Dropping skb.
[ 1146.579468] blackhole_netdev_xmit(): Dropping skb.
[ 1146.579502] blackhole_netdev_xmit(): Dropping skb.
[ 1146.579536] blackhole_netdev_xmit(): Dropping skb.