[    2.456266] ip (278) used greatest stack depth: 12352 bytes left
[  652.009040] ip (22246) used greatest stack depth: 12296 bytes left
[  667.795673] blackhole_netdev_xmit(): Dropping skb.
[  667.795732] blackhole_netdev_xmit(): Dropping skb.
[  667.795766] blackhole_netdev_xmit(): Dropping skb.
[  667.795803] blackhole_netdev_xmit(): Dropping skb.
[  781.544086] blackhole_netdev_xmit(): Dropping skb.
[  781.544165] blackhole_netdev_xmit(): Dropping skb.
[  781.544209] blackhole_netdev_xmit(): Dropping skb.
[  781.544247] blackhole_netdev_xmit(): Dropping skb.
[ 1238.802076] blackhole_netdev_xmit(): Dropping skb.
[ 1238.802146] blackhole_netdev_xmit(): Dropping skb.
[ 1238.802180] blackhole_netdev_xmit(): Dropping skb.
[ 1238.802212] blackhole_netdev_xmit(): Dropping skb.