Created attachment 1650361 [details]
evm.log

Description of problem:
Using ManageIQ (CFME upstream), when migrating VM (VMware to RHV) who is expected to fail at preflight check - the migration plan seems to be stuck in the preflight stage and cannot be canceled


Version-Release number of selected component (if applicable):
ManageIQ: master.20191217224046_ebd4ebf


How reproducible:
100%


Steps to Reproduce:
1. Create a infrastructure mapping with one cluster mapping
2. Create a migration plan with the previously created infrastructure mapping
3. Delete the cluster mapping item from Rails console:
   irb> mapping = TransformationMapping.find_by(:name => 'My Mapping')
   irb> mapping.transformation_mapping_items.select { |i| i.source_type == 'EmsCluster' }.each { |i| i.destroy }

4. Start the migration plan


Actual results:
The preflight check isn't reported the expected error status (see below) - task.status is OK.
It seems that the migration plan is stuck on preflight stage - "Waiting for an available conversion host..." is displayed in UI
And the migration plan cannot be canceled - pressing on 'Cancel Migration' button actually doesn't cancel it and the button becomes disabled after one try


Expected results:
The VM migration should fail right away, without waiting for a conversion host. This can be verified in Rails console:

irb> vm = Vm.find_by(:name => 'my_vm', :vendor => 'vmware')
irb> task = ServiceTemplateTransformationPlanTask.where(:source => vm).last
irb> task.status
=> "Error"
irb> task.conversion_host
=> nil


Additional info:
In log/evm.log, you can see the following error message:

[----] E, [2020-01-07T04:48:43.630262 #10908:8c260c] ERROR -- : Q-task_id([job_dispatcher]) /var/www/miq/vmdb/app/models/service_template_transformation_plan_task.rb:82:in `destination_cluster'


Attachment: evm.log