systemd: Specified group 'render' unknown

[coretemp]

Issue description

In journalctl, I see:

systemd-udevd[7440]: Specified group 'render' unknown

Same error for "kvm".

It doesn't seem to have any other effect, but it's just sloppy.

Technical details

• system: "x86_64-linux"
• host os: Linux 4.14.57, NixOS, 18.03.git.5b8a24a (Impala)
• multi-user?: no
• sandbox: yes
• version: nix-env (Nix) 2.0.4
• nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs

[typetetris]

/run/current-system/systemd/lib/udev/rules.d/50-udev-default.rules contains the offending configurations.

What would be a reasonable thing to do? Create those groups or change the default udev rules?

[typetetris]

From systemd README (obtained via nix-shell -E '(import <nixos> {}).systemd)' and then run unpackPhase):

USERS AND GROUPS:
Default udev rules use the following standard system group
names, which need to be resolvable by getgrnam() at any time,
even in the very early boot stages, where no other databases
and network are available:

    audio, cdrom, dialout, disk, input, kmem, kvm, lp, render, tape, tty, video

So those groups should probably exist.