Samba service fails to start after upgrading the system to RHEL 6.7

Issue

• On startup, smbd is failing with the following errors:

[2015/07/29 11:07:06.532362, 10] passdb/lookup_sid.c:76(lookup_name)
  lookup_name: EXAMPLE0\root => domain=[EXAMPLE0], name=[root]
[2015/07/29 11:07:06.532412, 10] passdb/lookup_sid.c:77(lookup_name)
  lookup_name: flags = 0x073
[2015/07/29 11:07:06.532760,  1] auth/token_util.c:581(create_token_from_username)
  root is a Domain Group, not a user
[2015/07/29 11:07:06.532821,  0] auth/auth_util.c:795(make_system_session_info_from_pw)
  create_local_token failed: NT_STATUS_NO_SUCH_USER
[2015/07/29 11:07:06.533142,  1] smbd/server.c:1228(main)
  ERROR: failed to setup system user info: NT_STATUS_NO_SUCH_USER.