[bug] nixos-rebuild switch fails on systemd-udev-settle.service

[coretemp]

Issue description

Job for systemd-udev-settle.service failed because the control process exited with error code.
See "systemctl status systemd-udev-settle.service" and "journalctl -xe" for details.
warning: the following units failed: systemd-udev-settle.service

● systemd-udev-settle.service - udev Wait for Complete Device Initialization
   Loaded: loaded (/nix/store/hjgd23fmmkfxyq896xwyarvgm81274an-systemd-237/example/systemd/system/systemd-udev-settle.service; linked; vendor preset: enabled)
   Active: failed (Result: exit-code) since Tue 2018-07-24 12:28:44 CEST; 371ms ago
     Docs: man:udev(7)
           man:systemd-udevd.service(8)
  Process: 10450 ExecStart=/nix/store/hjgd23fmmkfxyq896xwyarvgm81274an-systemd-237/bin/udevadm settle (code=exited, status=1/FAILURE)
 Main PID: 10450 (code=exited, status=1/FAILURE)

The error message is not useful either, because it doesn't say which device is responsible, etc. When I run nixos-rebuild switch again, it does work.

Steps to reproduce

Unknown

Technical details

• system: "x86_64-linux"
• host os: Linux 4.14.55, NixOS, 18.03.git.d6c6c7f (Impala)
• multi-user?: yes
• sandbox: no
• version: nix-env (Nix) 2.0.4
• nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs

[jfrankenau]

Duplicate, please see #21954.