write_to_journal() was called via $(...) command substitution, so SERVICE_COUNTER++ ran in a subshell and never incremented in the parent: [ 1492.668302] TEST-04-JOURNAL.sh[15064]: + local service=test-0-18493.service [ 1492.725882] TEST-04-JOURNAL.sh[15064]: + local service=test-0-18009.service [ 1492.739643] TEST-04-JOURNAL.sh[15064]: + local service=test-0-18493.service [ 1492.774586] TEST-04-JOURNAL.sh[15064]: + local service=test-0-25540.service [ 1492.815664] TEST-04-JOURNAL.sh[15064]: + local service=test-0-15916.service [ 1492.867067] TEST-04-JOURNAL.sh[15064]: + local service=test-0-20327.service [ 1492.899077] TEST-04-JOURNAL.sh[15064]: + local service=test-0-86.service [ 1497.289715] TEST-04-JOURNAL.sh[15064]: + local service=test-0-10849.service [ 1497.335791] TEST-04-JOURNAL.sh[15064]: + local service=test-0-18009.service With 99999 possible unit names collisions are rare but not impossible, so every now and then a CI run fails. Have write_to_journal() set a global SERVICE_NAME variable instead and call it directly so SERVICE_COUNTER actually goes up through the test.
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