It's a follow-up to https://github.com/systemd/systemd/pull/10200 where that fuzzer was introduced. At the time it was run regularly on machines where machine-id wasn't present so it was kind of reproducible. Now it's run on CIFuzz and CFLite using GHActions with the public OSS-Fuzz corpora (based on that particular machine-id) so to fully utilize those corpora it's necessary to use it always. Other than that it makes it possible for fuzzers targeting outgoing packets based on incoming packets like https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1795921 to get past client_parse_message on my machine :-)
System and Service Manager
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