Hello Simon,
The fix for the current release can be made, but, in order for that to
happen, we need an exact way how to make the error to happen, and what
was your use case. Reading Debian bug and this bug, it appears that
you've enabled cgroupv2, correct ?
You likely enabled:
systemd.unified_cgroup_hierarchy
When specified without an argument or with a true argument, enables
the usage of
unified cgroup hierarchy[8] (a.k.a. cgroups-v2). When specified with
a false argument,
fall back to hybrid or full legacy cgroup hierarchy.
in cmd line, right ? And your error happened because a cpu controller
cannot be added to cgroupsv2 if there is a realtime process.
Could you explain what is the realtime process, if you are aware of, and
why you need cgroups v2 enabled ? With that, perhaps we can backport a
specific fix for libvirt 5.0.0-1ubuntu2.5 (or later) and fix this
behavior.
Have you also tried removing rtkit package as a workaround ? Did it work
?
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https://bugs.launchpad.net/bugs/1845562
Title:
libvirt error Invalid value '+cpu' for 'cgroup.subtree_control'
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