2022-12-20 12:46:21,311 [INFO] {2023090} koji.build.buildroot:564 Running mock as kojibuilder
INFO: mock.py version 3.5 starting (python version = 3.6.8, NVR = mock-3.5-1.el8)...
INFO: Using 'dnf' instead of 'yum' for bootstrap chroot
Start(bootstrap): init plugins
INFO: selinux disabled
Finish(bootstrap): init plugins
Start: init plugins
INFO: selinux disabled
Finish: init plugins
INFO: Signal handler active
Start: run
Start: clean chroot
Finish: clean chroot
Start(bootstrap): chroot init
INFO: calling preinit hooks
INFO: enabled HW Info plugin
Mock Version: 3.5
INFO: Mock Version: 3.5
Start(bootstrap): dnf install
Finish(bootstrap): dnf install
Finish(bootstrap): chroot init
Start: chroot init
INFO: calling preinit hooks
INFO: enabled HW Info plugin
Mock Version: 3.5
INFO: Mock Version: 3.5
Start: yum install
ERROR: Command failed: 
 # /usr/bin/systemd-nspawn -q -M bf7596531b034f698c9f720b8dc1dd82 -D /var/lib/mock/dist-an7_9-updates-build-184331-60119-bootstrap/root -a --capability=cap_ipc_lock --bind=/tmp/mock-resolv.4cmhx4sp:/etc/resolv.conf --setenv=TERM=vt100 --setenv=SHELL=/bin/bash --setenv=HOME=/var/lib/mock/dist-an7_9-updates-build-184331-60119/root/installation-homedir --setenv=HOSTNAME=mock --setenv=PATH=/usr/bin:/bin:/usr/sbin:/sbin --setenv=PROMPT_COMMAND=printf "\033]0;<mock-chroot>\007" --setenv=PS1=<mock-chroot> \s-\v\$  --setenv=LANG=C.UTF-8 --setenv=LC_MESSAGES=C.UTF-8 --resolv-conf=off /usr/bin/yum --installroot /var/lib/mock/dist-an7_9-updates-build-184331-60119/root/ groupinstall build
Failed to determine whether the unified cgroups hierarchy is used: No medium found