Created attachment 1309649 [details]
vdsm log

Description of problem:
Power-off VM via the engine, raise Traceback in the vdsm log
2017-08-06 15:19:44,002+0300 ERROR (jsonrpc/3) [api] FINISH destroy error=Virtual machine does not exist: {'vmId': u'4854aff0-263e-43e9-ac83-6e55f5d49ef7'} (api:119)
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/vdsm/common/api.py", line 117, in method
    ret = func(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/vdsm/API.py", line 301, in destroy
    res = self.vm.destroy(gracefulAttempts)
  File "/usr/lib/python2.7/site-packages/vdsm/API.py", line 129, in vm
    raise exception.NoSuchVM(vmId=self._UUID)
NoSuchVM: Virtual machine does not exist: {'vmId': u'4854aff0-263e-43e9-ac83-6e55f5d49ef7'}

Version-Release number of selected component (if applicable):
vdsm-4.20.1-269.git4afc67d.el7.centos.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Start VM via the engine
2. Wait until the VM will have state UP
3. Power-off the VM

Actual results:
Power-off action succeeded and VM destroyed, but I can see Traceback under the vdsm.log

Expected results:
Power-off action succeeded and VM destroyed without any Traceback in vdsm log

Additional info:
Looks like VDSM runs two concurrent JSON requests to destroy VDSM, I checked the VDSM log in 4.1 and I can see, two destroy commands outputs for the same VM
2017-08-06 15:13:01,209+0300 INFO  (jsonrpc/7) [jsonrpc.JsonRpcServer] RPC call VM.destroy succeeded in 3.25 seconds (__init__:539)
2017-08-06 15:13:03,242+0300 INFO  (jsonrpc/5) [jsonrpc.JsonRpcServer] RPC call VM.destroy failed (error 1) in 0.00 seconds (__init__:539)