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We hadn't noticed this because (a) few people feed invalid timezone abbreviation files to the server, and (b) in typical scenarios guc.c would throw ereport(ERROR) and then transaction abort handling would silently clean up the leaked file reference. However, it was possible to observe file leakage warnings if one breaks an already-active abbreviation file, because guc.c does not throw ERROR when loading supposedly-validated settings during session start or SIGHUP processing. Report and fix by Kyotaro Horiguchi (cosmetic adjustments by me) Discussion: https://postgr.es/m/20220530.173740.748502979257582392.horikyota.ntt@gmail.com