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+after upgrade to 6.1.0, snapshot creation fails with "pre-save failed: qxl"
+Description of problem:
+When trying to create a snapshot using `virsh --connect qemu:///system snapshot-create-as <domain-name> <snapshot-name>` or virt-manager GUI, I get the following error:
+
+```
+Error: Error while writing VM state: Unknown error -1
+
+
+Traceback (most recent call last):
+  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 65, in cb_wrapper
+    callback(asyncjob, *args, **kwargs)
+  File "/usr/share/virt-manager/virtManager/details/snapshots.py", line 237, in _do_create_snapshot
+    self.vm.create_snapshot(xml)
+  File "/usr/share/virt-manager/virtManager/object/domain.py", line 1124, in create_snapshot
+    self._backend.snapshotCreateXML(xml, flags)
+  File "/usr/lib/python3.9/site-packages/libvirt.py", line 3059, in snapshotCreateXML
+    raise libvirtError('virDomainSnapshotCreateXML() failed')
+libvirt.libvirtError: operation failed: Failed to take snapshot: pre-save failed: qxl
+Error: Error while writing VM state: Unknown error -1
+```
+Additional information:
+I'm using Arch Linux distro packages.
+The issue appeared after upgrading qemu-headless from 6.0.0 to 6.1.0.
+Downgrading back to 6.0.0 fixes the problem (snapshot are created
+successfully and work as expected).
+
+In a reply to my message to libvirt-users describing the issue [1],
+Daniel P. Berrangé confirmed that the error comes from QEMU and
+recommended reporting it here.
+
+[1] https://listman.redhat.com/archives/libvirt-users/2021-September/msg00007.html