[1.20-63~havana] First Ping packet failure seen in multi-stage ECMP scenario

[Ganesha HV]

Setup
=====
env.roledefs = {
    'all': [host1, host2, host3, host4, host5],
    'cfgm': [host1],
    'control': [host2, host3],
    'compute': [host4, host5],
    'collector': [host1],
    'openstack': [host1],
    'webui': [host1],
    'database': [host1],
    'build': [host_build],
}

env.hostnames = {
     'all': ['nodec4', 'nodec5', 'nodec26', 'nodei27', 'nodei28']
}

1]. Have a 3-stage ECMP service chain between vn1 and vn2 as below :

vm1 ---- bridge(2 SI) ---- in-net(2 SI) ---- nat(2 SI) ---vm2

2]. Observed that the ping from vm1 to vm2 is passing, but the first packet fails.

Shown to Naveen.

Reproducible : 3/3 times.

[Naveen N (naveenn)]

Duplicate of bug #1385272