Describe the bug

The channel-blocking networking.networkd.privacy test is failing. The test hangs for 15 minutes and times out. I bisected this failure to commit ef050bc “systemd: 246.6 -> 247-rc2” (#102355), then bisected systemd and found systemd/systemd@5e0534f (systemd/systemd#17240) to be the first bad commit.

To Reproduce
nix build -Lf ~/nixpkgs nixosTests.networking.networkd.privacy

Notify maintainers
@Mic92 @andir @edolstra @flokli @kloenk

Metadata

• system: "x86_64-linux"
• host os: Linux 5.4.81, NixOS, 21.03.git.b7c48f3ea5c (Okapi)
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.3.9
• channels(root): "nixos-21.03pre257780.e9158eca70a"
• nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixos

Maintainer information:

# a list of nixpkgs attributes affected by the problem
attribute: [systemd]
# a list of nixos modules affected by the problem
module: []