I've noticed on and off during random reboots I'll occasionally get the following error messages when openrc does its thing.

/lib64/rc/sh/rc-cgroup.sh: line 91: /sys/fs/cgroup/openrc/loopback/tasks: No such file or directory
/lib64/rc/sh/rc-cgroup.sh: line 91: /sys/fs/cgroup/openrc/swapfiles/tasks: No such file or directory
/lib64/rc/sh/rc-cgroup.sh: line 91: printf: write error: No such device

Never do I get these messages all at once, but occasionally one of them will appear during the boot up process. I've checked the logs but I can't find anything associated with these error messages.