[    1.635658] ip (262) used greatest stack depth: 12248 bytes left
[    2.049825] ip (293) used greatest stack depth: 12216 bytes left
[    4.741753] ip (436) used greatest stack depth: 12200 bytes left
[   12.886172] mpls_gso: MPLS GSO support
[  668.370380] blackhole_netdev_xmit(): Dropping skb.
[  668.370485] blackhole_netdev_xmit(): Dropping skb.
[  668.370548] blackhole_netdev_xmit(): Dropping skb.
[  668.370601] blackhole_netdev_xmit(): Dropping skb.