[Qemu-devel] [Bug 1816189] Re: Unable to create or revert snapshots

[Larry Dewey <larry.j.dewey@gmail.com>]

Adding System Information

** Attachment added: "System-Details.txt"
   https://bugs.launchpad.net/qemu/+bug/1816189/+attachment/5238921/+files/System-Details.txt

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Title:
  Unable to create or revert snapshots

Status in QEMU:
  New

Bug description:
  With an update to Qemu (3.1.x) I am unable to revert snapshots using
  virt-manager or virsh. Virtual Machines existing before the update
  seem to function properly. It is only after creating a new machine
  that snapshots are misbehaving. I tested spinning up vms of
  tumbleweed, leap15, and ubuntu 18.04. Each of them had the following
  issues:

  - With the machine running, live reversions act like they apply, but no changes are actually made.
  - With the machine paused, reversion also does not apply.
  - With the machine turned off, reversion is not possible. Virsh is unable to find the snapshot, and virt-manager errors out with:

  Error running snapshot 'FreshInstall': internal error: qemu
  unexpectedly closed the monitor: 2019-01-15T19:19:46.020247Z qemu-
  system-x86_64: Device 'drive-virtio-disk0' does not have the requested
  snapshot 'FreshInstall'

  Traceback (most recent call last):
    File "/usr/share/virt-manager/virtManager/asyncjob.py", line 75, in cb_wrapper
      callback(asyncjob, *args, **kwargs)
    File "/usr/share/virt-manager/virtManager/asyncjob.py", line 111, in tmpcb
      callback(*args, **kwargs)
    File "/usr/share/virt-manager/virtManager/libvirtobject.py", line 66, in newfn
      ret = fn(self, *args, **kwargs)
    File "/usr/share/virt-manager/virtManager/domain.py", line 1105, in revert_to_snapshot
      self._backend.revertToSnapshot(snap.get_backend())
    File "/usr/lib64/python3.6/site-packages/libvirt.py", line 2024, in revertToSnapshot
      if ret == -1: raise libvirtError ('virDomainRevertToSnapshot() failed', dom=self)

  libvirt.libvirtError: internal error: qemu unexpectedly closed the
  monitor: 2019-01-15T19:19:46.020247Z qemu-system-x86_64: Device
  'drive-virtio-disk0' does not have the requested snapshot
  'FreshInstall'

  After doing some digging, the error occurs because of the following commit:
  d98f26073bebddcd3da0ba1b86c3a34e840c0fb8

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