[    2.023819] ip (247) used greatest stack depth: 12376 bytes left
[    2.700497] ip (281) used greatest stack depth: 12360 bytes left
[    5.904945] ip (448) used greatest stack depth: 12344 bytes left
[   15.920615] mpls_gso: MPLS GSO support
[ 1155.524236] blackhole_netdev_xmit(): Dropping skb.
[ 1155.524419] blackhole_netdev_xmit(): Dropping skb.
[ 1155.524457] blackhole_netdev_xmit(): Dropping skb.
[ 1155.524499] blackhole_netdev_xmit(): Dropping skb.