[    1.944717] ip (251) used greatest stack depth: 12480 bytes left
[    1.982277] ip (254) used greatest stack depth: 12416 bytes left
[    2.581373] ip (285) used greatest stack depth: 12384 bytes left
[   16.010682] mpls_gso: MPLS GSO support
[   17.321569] ip (1469) used greatest stack depth: 12320 bytes left
[  678.656120] blackhole_netdev_xmit(): Dropping skb.
[  678.656199] blackhole_netdev_xmit(): Dropping skb.
[  678.656243] blackhole_netdev_xmit(): Dropping skb.
[  678.656281] blackhole_netdev_xmit(): Dropping skb.