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

[Thomas Huth]

Can you still reproduce this issue with the latest version of QEMU and
libvirt? Anyway, since the problem occurs with libvirt, have you already
tried to report this issue to the libvirt project instead?

** Changed in: qemu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1816189

Title:
  Unable to create or revert snapshots

Status in QEMU:
  Incomplete

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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