vpp-agent does not configure rx-mode about vpp-agent HOT 8 CLOSED

time="2019-06-04T14:14:14Z" level=warning msg="Unable to deliver the notification, reciever end not ready." msg_id=83 msg_name=sw_interface_event msg_size=17

2019-06-04 08:04:01,108 DEBG 'agent' stdout output:
time="2019-06-04 08:04:01.10817" level=debug msg="Interface state notification for memif181 (idx: 2): &{SwIfIndex:2 AdminState:0 LinkState:0 Deleted:false}" loc="ifplugin/interface_state.go(345)" logger=vpp-ifplugin.if-state
time="2019-06-04 08:04:01.10825" level=debug msg="Interface state notification for memif180 (idx: 1): &{SwIfIndex:1 AdminState:0 LinkState:0 Deleted:false}" loc="ifplugin/interface_state.go(345)" logger=vpp-ifplugin.if-state
+======================================================================================================================+
| Transaction #18                                                                                      SB Notification |
+======================================================================================================================+
  * transaction arguments:
      - seq-num: 18
      - type: SB Notification
      - values:
          - key: vpp/interface/memif181/link-state/DOWN
            val: <EMPTY>
          - key: vpp/interface/memif181/link-state/UP
            val: <NIL>


2019-06-04 08:04:01,140 DEBG 'vpp' stdout output:
/usr/bin/vpp[11]: set_hw_interface_rx_mode: invalid interface

2019-06-04 08:04:01,140 DEBG 'agent' stdout output:
time="2019-06-04 08:04:01.13947" level=warning msg="failed to un-configure Rx-mode (VPPApiError: Unimplemented (-9)) - most likely the interface is already without a link" loc="descriptor/rx_mode.go(214)" logger=vpp-ifplugin.rx-mode-descriptor
o----------------------------------------------------------------------------------------------------------------------o
  * executed operations (2019-06-04 08:04:01.108 +0000 UTC -> 2019-06-04 08:04:01.14 +0000 UTC, dur: 31ms):
      1. DELETE [DERIVED IS-PENDING]:
          - key: vpp/interface/memif181/rx-modes
          - value: { name:"memif181" type:MEMIF rx_modes:<mode:ADAPTIVE default_mode:true >  } 
      2. DELETE [WAS-OBTAINED]:
          - key: vpp/interface/memif181/link-state/UP
          - value: <EMPTY> 
      3. CREATE [OBTAINED]:
          - key: vpp/interface/memif181/link-state/DOWN
          - value: <EMPTY> 
x----------------------------------------------------------------------------------------------------------------------x
| #18                                                                                                      took 31.2ms |
x----------------------------------------------------------------------------------------------------------------------x

vpp# sh inter rx-placement 
Thread 1 (vpp_wk_0):
  node memif-input:
    memif1/0 queue 0 (adaptive)
    memif1/1 queue 0 (adaptive)

vpp# sh inter rx-placement 
Thread 1 (vpp_wk_0):
  node memif-input:
    memif1/0 queue 0 (polling)
    memif1/1 queue 0 (polling)