[    2.095558] ip (240) used greatest stack depth: 12352 bytes left
[    2.731294] ip (274) used greatest stack depth: 12320 bytes left
[  630.460716] ip (25776) used greatest stack depth: 12048 bytes left
[  876.074336] blackhole_netdev_xmit(): Dropping skb.
[  876.074398] blackhole_netdev_xmit(): Dropping skb.
[  876.074434] blackhole_netdev_xmit(): Dropping skb.
[  876.074474] blackhole_netdev_xmit(): Dropping skb.
[ 1201.363034] blackhole_netdev_xmit(): Dropping skb.
[ 1201.363113] blackhole_netdev_xmit(): Dropping skb.
[ 1201.363151] blackhole_netdev_xmit(): Dropping skb.
[ 1201.363199] blackhole_netdev_xmit(): Dropping skb.
[ 1228.171331] blackhole_netdev_xmit(): Dropping skb.
[ 1228.171396] blackhole_netdev_xmit(): Dropping skb.
[ 1228.171430] blackhole_netdev_xmit(): Dropping skb.
[ 1228.171465] blackhole_netdev_xmit(): Dropping skb.