When executed on a systemd with an empty /etc/machine-id, test-journal-interleaving fails in test_sequence_numbers_one() when re-opening the existing "two.journal". This is because opening the existing journal file with managed_journal_file_open() causes journal_file_verify_header() to be called. This function tries to compare the current machine-id to the machine-id in the journal file header, but does not handle the case where the machine-id is empty or non-existent. Check if we have an initialized machine-id before executing this portion of the test.
System and Service Manager
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