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[efineshi <2040038@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Description
===========

if we evacuate a vm agent when if is still evacuating, it will leads the
vm be many unexpect errors.

so, wo don't allow the vm to be evacuated when it is in rebuilding state
before Train version, but this patch makes it allowed.

https://review.opendev.org/c/openstack/nova/+/864169


Steps to reproduce
==================

1. create a vm

2. down the host compute node

3. evacuate the vm last twice

openstack server evacuate XXXXX
openstack server evacuate XXXX

Expected result
===============

it should be not allowed to evacuate twice.

Actual result
=============

the 2nd evacuate are allowed and the vm will be error, if the vm is
created in the other node, but not

evacuate completed, it will be evacuate again, and leads to many errors,
such as double alive, or if it

is schedued to the same node, it will be error and can't be evacuate as
the vm or vm files exsit.


Environment
===========


openstack wallaby / master

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2040038

Title:
  evacuate a vm when it is evacuating will cause vm error

Status in OpenStack Compute (nova):
  New

Bug description:
  Description
  ===========

  if we evacuate a vm agent when if is still evacuating, it will leads
  the vm be many unexpect errors.

  so, wo don't allow the vm to be evacuated when it is in rebuilding
  state before Train version, but this patch makes it allowed.

  https://review.opendev.org/c/openstack/nova/+/864169

  
  Steps to reproduce
  ==================

  1. create a vm

  2. down the host compute node

  3. evacuate the vm last twice

  openstack server evacuate XXXXX
  openstack server evacuate XXXX

  Expected result
  ===============

  it should be not allowed to evacuate twice.

  Actual result
  =============

  the 2nd evacuate are allowed and the vm will be error, if the vm is
  created in the other node, but not

  evacuate completed, it will be evacuate again, and leads to many
  errors, such as double alive, or if it

  is schedued to the same node, it will be error and can't be evacuate
  as the vm or vm files exsit.

  
  Environment
  ===========

  
  openstack wallaby / master

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