[    1.782069] ip (247) used greatest stack depth: 12352 bytes left
[    2.156234] ip (275) used greatest stack depth: 12320 bytes left
[  634.914233] ip (14693) used greatest stack depth: 12304 bytes left
[  796.051094] blackhole_netdev_xmit(): Dropping skb.
[  796.051151] blackhole_netdev_xmit(): Dropping skb.
[  796.051186] blackhole_netdev_xmit(): Dropping skb.
[  796.051223] blackhole_netdev_xmit(): Dropping skb.
[ 1130.614762] blackhole_netdev_xmit(): Dropping skb.
[ 1130.614832] blackhole_netdev_xmit(): Dropping skb.
[ 1130.614888] blackhole_netdev_xmit(): Dropping skb.
[ 1130.614923] blackhole_netdev_xmit(): Dropping skb.