[Pkg-libvirt-maintainers] Bug#939983: error: Unable to read from '/sys/fs/cgroup/unified/machine/cgroup.controllers'

[Anthony DeRobertis]

Package: libvirt-daemon
Version: 5.6.0-2
Followup-For: Bug #939983

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Searching the web led to a suggestion this is from libvirt not realizing
its on a systemd machine and trying to use non-systemd cgroups. (It
should be machine.slice under systemd).

Installing systemd-container, making sure it was started
(machines.target and machine.slice, though maybe that'll happen
automatically --- certainly should on reboot), and restarting libvirt
fixed it here.

- -- System Information:
Debian Release: bullseye/sid
  APT prefers testing-debug
  APT policy: (500, 'testing-debug'), (500, 'stable-updates'), (500, 'testing'), (500, 'stable'), (130, 'unstable-debug'), (130, 'unstable'), (120, 'experimental-debug'), (120, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.19.0-5-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages libvirt-daemon depends on:
ii  libblkid1           2.34-0.1
ii  libc6               2.29-2
ii  libcap-ng0          0.7.9-2+b1
ii  libdbus-1-3         1.12.16-2
ii  libdevmapper1.02.1  2:1.02.155-3
ii  libfuse2            2.9.9-2
ii  libgcc1             1:9.2.1-8
ii  libgnutls30         3.6.9-5
ii  libnetcf1           1:0.2.8-1+b3
ii  libparted2          3.3-1
ii  libpcap0.8          1.9.1-2
ii  libpciaccess0       0.14-1
ii  libselinux1         2.9-2+b2
ii  libudev1            242-7
ii  libvirt0            5.6.0-2
ii  libxenmisc4.11      4.11.1+92-g6c33308a8d-2+b1
ii  libxenstore3.0      4.11.1+92-g6c33308a8d-2+b1
ii  libxentoollog1      4.11.1+92-g6c33308a8d-2+b1
ii  libxml2             2.9.4+dfsg1-7+b3

Versions of packages libvirt-daemon recommends:
ii  libxml2-utils   2.9.4+dfsg1-7+b3
ii  netcat-openbsd  1.203-2
ii  qemu-kvm        1:4.1-1+b2

Versions of packages libvirt-daemon suggests:
pn  libvirt-daemon-driver-storage-gluster  <none>
pn  libvirt-daemon-driver-storage-rbd      <none>
pn  libvirt-daemon-driver-storage-zfs      <none>
ii  libvirt-daemon-system                  5.6.0-2
pn  numad                                  <none>

- -- no debconf information

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