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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

** Also affects: nova/train
   Importance: Undecided
       Status: New

** Changed in: nova/train
   Importance: Undecided => Low

** Changed in: nova/train
       Status: New => In Progress

** Changed in: nova/train
     Assignee: (unassigned) => Matt Riedemann (mriedem)

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https://bugs.launchpad.net/bugs/1551703

Title:
  Resize a vm that vm_state is "stopped"  failure， vm's task_state
  rollback to "active"

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) train series:
  In Progress

Bug description:
  1. version
  kilo 2015.1.0

  2. Reproduce steps
  2.1 create a instance, then stop it.

  [root@SBCJNailSlot3 ~(keystone_admin)]# nova list
  +--------------------------------------+--------+---------+--------------+-------------+-------------------+
  | ID                                   | Name   | Status  | Task State   | Power State | Networks          |
  +--------------------------------------+--------+---------+--------------+-------------+-------------------+
  | 6fe59445-fb89-47ab-9ead-2476c4522a61 | njq    | SHUTOFF | -            | Shutdown    | test=192.168.1.52 |
  +--------------------------------------+--------+---------+--------------+-------------+-------------------+

  2.2 resize the instance use a new flavor which it's disk less than current flavor's disk
  [root@SBCJNailSlot3 ~(keystone_admin)]# nova resize 6fe59445-fb89-47ab-9ead-2476c4522a61 45

  disk value in the current flavor of  instance “njq” is 20
  disk value in the  flavor which id equal 45 is 18.
  So this resize action will  trigger ResizeError that msg is unable to resize disk down.
  Then enter the rollback process

  2.3 rollback result：
  [root@SBCJNailSlot3 ~(keystone_admin)]# nova list
  +--------------------------------------+--------+---------+--------------+-------------+-------------------+
  | ID                                   | Name   | Status  | Task State   | Power State | Networks          |
  +--------------------------------------+--------+---------+--------------+-------------+-------------------+
  | 6fe59445-fb89-47ab-9ead-2476c4522a61 | njq    | ACTIVE  | -            | Shutdown    | test=192.168.1.52 |
  +--------------------------------------+--------+---------+--------------+-------------+-------------------+

  Although the finally vm_state of instance will be set to stoped by  heal_instance_state.
  But the process often takes some time.

  IMO， This process is not reasonable, and need fix.

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