Bug#947984: libvirt-daemon-driver-lxc: internal error: Unable to find 'devices' cgroups controller mount in cgroup2 / unified hierarchy

[Ryutaroh Matsumoto]

Package: libvirt-daemon-driver-lxc
Version: 5.6.0-3
Severity: normal
User: pkg-systemd-maintainers at lists.alioth.debian.org
Usertags: cgroupv2
Control: block 943981 by -1

Dear Maintainer,

libvirt-daemon-driver-lxc fails in cgroup2 / unified hierarchy
(host Linux booted with systemd.unified_cgroup_hierarchy)
with the following error message:

root at debian:~# virt-install  --connect lxc:/ --os-variant fedora30 --memory 2096 --filesystem /var/lib/lxc/chrome1/rootfs,/ --network network=default,model=virtio --graphics=vnc,listen=0.0.0.0 --video qxl --accelerate --cpuset 2 --cpu host-model --transient --import --name chrommee 
WARNING  Graphics requested but DISPLAY is not set. Not running virt-viewer.
WARNING  No console to launch for the guest, defaulting to --wait -1

Starting install...
ERROR    internal error: Unable to find 'devices' cgroups controller mount
Domain installation does not appear to have been successful.
If it was, you can restart your domain by running:
  virsh --connect lxc:/ start chrommee
otherwise, please restart your installation.
root at debian:~# virsh --connect lxc:/ start chrommee
error: failed to get domain 'chrommee'

Best regards, Ryutaroh Matsumoto

-- System Information:
Debian Release: bullseye/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.3.0-3-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages libvirt-daemon-driver-lxc depends on:
ii  libblkid1       2.34-0.1
ii  libc6           2.29-3
ii  libcap-ng0      0.7.9-2.1+b1
ii  libfuse2        2.9.9-2
ii  libgcc1         1:9.2.1-21
ii  libvirt-daemon  5.6.0-3
ii  libvirt0        5.6.0-3
ii  libxml2         2.9.4+dfsg1-8

libvirt-daemon-driver-lxc recommends no packages.

libvirt-daemon-driver-lxc suggests no packages.

-- no debconf information