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[Bug 1919487] Re: virDomainBlockCommit called when deleting an intermediary snapshot via os-assisted-volume-snapshots even when instance is shutoff

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

** Changed in: nova/wallaby
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1919487

Title:
  virDomainBlockCommit called when deleting an intermediary snapshot via
  os-assisted-volume-snapshots even when instance is shutoff

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

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

  Attempting to delete a NFS volume snapshot (via c-api and the the os-
  assisted-volume-snapshots n-api) of a volume attached to a SHUTOFF
  instance currently results in n-cpu attempting to fire off a
  virDomainBlockCommit command even though the instance isn't running.

  Steps to reproduce
  ==================
  1. Create multiple volume snapshots against a volume.
  2. Attach the volume to an ACTIVE instance.
  3. Stop the instance and ensure it is SHUTOFF.
  4. Attempt to delete an intermediary snapshot.

  Expected result
  ===============
  qemu-img commit or qemu-img rebase should be used to handle this offline.

  Actual result
  =============
  virDomainBlockCommit is called even though the domain isn't running.

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

  1. Exact version of OpenStack you are running. See the following
    list for all releases: http://docs.openstack.org/releases/

     master

  2. Which hypervisor did you use?
     (For example: Libvirt + KVM, Libvirt + XEN, Hyper-V, PowerKVM, ...)
     What's the version of that?

     libvirt + KVM

  2. Which storage type did you use?
     (For example: Ceph, LVM, GPFS, ...)
     What's the version of that?

     NFS c-vol

  3. Which networking type did you use?
     (For example: nova-network, Neutron with OpenVSwitch, ...)

     N/A

  Logs & Configs
  ==============

  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server [req-570281c6-566e-44a3-9953-eeb634513778 req-0fbbe87f-fd1d-4861-9fb3-21b8eb011e55 service nova] Exception during message handling: libvirt.libvirtError: Requested operation is not valid: domain is not >
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server Traceback (most recent call last):
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server   File "/usr/local/lib/python3.7/site-packages/oslo_messaging/rpc/server.py", line 165, in _process_incoming
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server     res = self.dispatcher.dispatch(message)
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server   File "/usr/local/lib/python3.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 273, in dispatch
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server     return self._do_dispatch(endpoint, method, ctxt, args)
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server   File "/usr/local/lib/python3.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 193, in _do_dispatch
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server     result = func(ctxt, **new_args)
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server   File "/usr/local/lib/python3.7/site-packages/oslo_messaging/rpc/server.py", line 241, in inner
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server     return func(*args, **kwargs)
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/exception_wrapper.py", line 78, in wrapped
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server     function_name, call_dict, binary)
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server   File "/usr/local/lib/python3.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server     self.force_reraise()
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server   File "/usr/local/lib/python3.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server   File "/usr/local/lib/python3.7/site-packages/six.py", line 703, in reraise
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server     raise value
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/exception_wrapper.py", line 69, in wrapped
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server     return f(self, context, *args, **kw)
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/compute/manager.py", line 3916, in volume_snapshot_delete
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server     snapshot_id, delete_info)
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 3129, in volume_snapshot_delete
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server     context, snapshot_id, 'error_deleting')
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server   File "/usr/local/lib/python3.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server     self.force_reraise()
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server   File "/usr/local/lib/python3.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server   File "/usr/local/lib/python3.7/site-packages/six.py", line 703, in reraise
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server     raise value
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 3122, in volume_snapshot_delete
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server     snapshot_id, delete_info=delete_info)
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 3107, in _volume_snapshot_delete
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server     result = dev.commit(commit_base, commit_top, relative=True)
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/virt/libvirt/guest.py", line 809, in commit
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server     self._disk, base, top, self.COMMIT_DEFAULT_BANDWIDTH, flags=flags)
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server   File "/usr/local/lib/python3.7/site-packages/eventlet/tpool.py", line 190, in doit
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server     result = proxy_call(self._autowrap, f, *args, **kwargs)
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server   File "/usr/local/lib/python3.7/site-packages/eventlet/tpool.py", line 148, in proxy_call
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server     rv = execute(f, *args, **kwargs)
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server   File "/usr/local/lib/python3.7/site-packages/eventlet/tpool.py", line 129, in execute
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server     six.reraise(c, e, tb)
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server   File "/usr/local/lib/python3.7/site-packages/six.py", line 703, in reraise
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server     raise value
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server   File "/usr/local/lib/python3.7/site-packages/eventlet/tpool.py", line 83, in tworker
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server     rv = meth(*args, **kwargs)
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server   File "/usr/local/lib64/python3.7/site-packages/libvirt.py", line 728, in blockCommit
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server     if ret == -1: raise libvirtError ('virDomainBlockCommit() failed', dom=self)
  Jul 03 09:37:57 localhost.localdomain nova-compute[127223]: ERROR oslo_messaging.rpc.server libvirt.libvirtError: Requested operation is not valid: domain is not running

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