[ 2.427671] ip (280) used greatest stack depth: 12344 bytes left [ 16.047823] mpls_gso: MPLS GSO support [ 637.912498] ip (17786) used greatest stack depth: 12120 bytes left [ 893.036491] blackhole_netdev_xmit(): Dropping skb. [ 893.036577] blackhole_netdev_xmit(): Dropping skb. [ 893.036630] blackhole_netdev_xmit(): Dropping skb. [ 893.036683] blackhole_netdev_xmit(): Dropping skb.