On Thu, Sep 09, 2021 at 02:33:25PM +0200, Štěpán Němec wrote:
>
> 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?
Yes, auite likely related to the QEMU update as
"pre-save failed: qxl"
is an error message that libvirt is getting back from QEMU.
There was a change in this code in qemu in 6.1.0, but that was
replacing an assert() with this graceful error message. So if
anything your older QEMU ought to have been crashing !
Anyway, I think you need to report this to the QEMU community.
Regards,
Daniel
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