Comment 1 for bug 1572418

(gdb) bt
#0 NhDecode (nh=<optimized out>, nh@entry=0x7fc2080aafe0, pkt=pkt@entry=0x7fc1708b0110, info=info@entry=0x7fc21db9b8a0, in=in@entry=0x7fc21db9b820, out=out@entry=0x7fc21db9b860,
    force_vmport=force_vmport@entry=false, ecmp_load_balance=...) at controller/src/vnsw/agent/pkt/pkt_flow_info.cc:305
#1 0x0000000000c387b0 in NhDecode (ecmp_load_balance=..., force_vmport=false, out=0x7fc21db9b860, in=0x7fc21db9b820, info=0x7fc21db9b8a0, pkt=0x7fc1708b0110, nh=0x7fc2080aafe0)
    at controller/src/vnsw/agent/pkt/pkt_flow_info.cc:409
#2 RouteToOutInfo (rt=<optimized out>, pkt=pkt@entry=0x7fc1708b0110, info=info@entry=0x7fc21db9b8a0, in=in@entry=0x7fc21db9b820, out=out@entry=0x7fc21db9b860)
    at controller/src/vnsw/agent/pkt/pkt_flow_info.cc:409
#3 0x0000000000c3c354 in PktFlowInfo::IngressProcess (this=this@entry=0x7fc21db9b8a0, pkt=pkt@entry=0x7fc1708b0110, in=in@entry=0x7fc21db9b820, out=out@entry=0x7fc21db9b860)
    at controller/src/vnsw/agent/pkt/pkt_flow_info.cc:1141
#4 0x0000000000c3ce4e in PktFlowInfo::Process (this=this@entry=0x7fc21db9b8a0, pkt=0x7fc1708b0110, in=in@entry=0x7fc21db9b820, out=out@entry=0x7fc21db9b860)
    at controller/src/vnsw/agent/pkt/pkt_flow_info.cc:1424
#5 0x0000000000c48ffd in FlowHandler::Run (this=0x7fc1e32a8820) at controller/src/vnsw/agent/pkt/flow_handler.cc:112
#6 0x0000000000c452d4 in RunProtoHandler (handler=0x7fc1e32a8820, this=0x7fc21db9ba90) at controller/src/vnsw/agent/pkt/proto.cc:51
#7 Proto::ProcessProto (this=this@entry=0x7fc20d027030, msg_info=...) at controller/src/vnsw/agent/pkt/proto.cc:66
#8 0x0000000000c29e90 in FlowProto::FlowEventHandler (this=0x7fc20d027030, req=0x7fc1864e5930, table=<optimized out>) at controller/src/vnsw/agent/pkt/flow_proto.cc:396