On Thu, Aug 27, 2026 at 10:28:45AM +0200, Sascha Frey wrote:
> Package: libvirt-daemon-driver-qemu
> Version: 11.3.0-3+deb13u2
> Severity: important
>
> Dear Maintainer,
>
> After upgrading our VM hosts from Debian 12 to Debian 13 (trixie),
> live migration of VMs from the upgraded hosts started failing.
>
> The affected hosts use:
>
> libvirt 11.3.0-3+deb13u2
> qemu-system-x86 1:11.0.2+ds-2~bpo13+1
>
> The QEMU processes were restarted after the Debian upgrade, so all
> running VMs were using the new QEMU version.
>
> I attempted a normal live migration using virsh, for example:
>
> virsh -c qemu+ssh://SOURCE/system migrate \
> --live --persistent --undefinesource \
> VMNAME \
> qemu+ssh://DEST/system \
> tcp://migrate.DEST/
>
> The migration fails with:
>
> error: internal error: unable to execute QEMU command 'migrate':
> Parameter 'detach' is unexpected
>
> The problem can also be reproduced directly through QMP:
>
> virsh qemu-monitor-command VMNAME --pretty \
> '{"execute":"migrate","arguments":{"detach":true}}'
>
> QEMU 11 responds with:
>
> Parameter 'detach' is unexpected
>
> I locally backported the upstream libvirt change
> "qemuMonitorJSONMigrate: Drop 'detach' QMP option" to
> 11.3.0-3+deb13u2.
>
> After rebuilding and installing the modified libvirt package,
> live migration works successfully again.
>
> I therefore believe the Debian trixie libvirt package needs the
> upstream fix for compatibility with QEMU 11.
>
> Please consider backporting this upstream fix to the trixie package.
> Alternatively, a newer libvirt version could be made available
> through trixie-backports.
>
> Upstream patch:
> https://www.mail-archive.com/[email protected]/msg10575.htmlRunning a backported version of QEMU is probably not the best idea overall, since obviously the older libvirt cannot possibly know about incompatible changes in the newer QEMU. Anyway, in this case the fix is quite trivial so I've included it in the upload that will hopefully make it into the next trixie stable update (approval from the release team pending). https://salsa.debian.org/libvirt-team/libvirt/-/merge_requests/296 https://bugs.debian.org/1146164 -- Andrea Bolognani <[email protected]> Resistance is futile, you will be garbage collected.
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