Unable to delete heat stack

Issue

• Unable to delete heat stack.

  
  $ openstack stack show 3bc534fd-621e-4e7f-b6e8-8a80ec9c9b68
  +-----------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  | Field                 | Value                                                                                                                                                                                   |
  +-----------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  | id                    | 3bc534fd-621e-4e7f-b6e8-8a80ec9c9b68                                                                                                                                                    |
  | stack_name            | production-cfme-5.9-ose-3.5-cfme-stack                                                                                                                                                  |
  | description           | HOT template to create a new neutron network plus a router to the public network, and for deploying one server into the new network. The template also assigns floating IP addresses to |
  |                       | each server so they are routable from the public network.                                                                                                                               |
  |                       |                                                                                                                                                                                         |
  | creation_time         | 2017-12-14T22:49:58Z                                                                                                                                                                    |
  | updated_time          | 2017-12-15T12:31:33Z                                                                                                                                                                    |
  | stack_status          | DELETE_FAILED                                                                                                                                                                           |
  | stack_status_reason   | Resource DELETE failed: BadRequest: resources.cinder_volume: Invalid volume: Volume status must be available or error or error_restoring or error_extending and must not be migrating,  |
  |                       | attached, belong to a group or have snapshots. (HTTP 400) (Request-ID: req-9cb8924e-29cd-4ed4-93a7-72741804f970)                                                                        |