Hello,
until very recently I had been happily creating snapshots of running VMs
(created using virt-install) simply with
virsh --connect qemu:///system snapshot-create-as <domain-name>
<snapshot-name>
Now when I try to do that I get the following error:
Error creating snapshot: operation failed: Failed to take snapshot: pre-save
failed: qxl
Same thing trying to create a snapshot from virt-manager (which also
used to work). Here's the full backtrace (as displayed in virt-manager):
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
I am on Arch Linux (x86_64), using the distro packages. Checking my
pacman logs, might update of qemu-headless from 6.0.0 to 6.1.0 have
something to do with that?
(Since then, libvirt has also been updated from 7.6.0 to 7.7.0, but I
see no change WRT the problem described.)
I would appreciate any advice on how to further investigate and/or work
around the problem.
(I checked https://gitlab.com/libvirt/libvirt/-/issues and didn't find
anything that seemed related.)
Thanks,
Štěpán
