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Re: snapshot creation broken recently?



On Thu, 09 Sep 2021 19:28:04 +0100
Daniel P. Berrangé wrote:

> On Thu, Sep 09, 2021 at 02:33:25PM +0200, Štěpán Němec wrote:
>> 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.

Thanks!

> 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 !

Not only were/is it not crashing; downgrading the package back to 6.0.0
makes the snapshots work again.

> Anyway, I think you need to report this to the QEMU community.

Filed as https://gitlab.com/qemu-project/qemu/-/issues/610

Thank you,

  Štěpán



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