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Commit0bada39c83fixed a bug of this kind, which existed in all branches for six days before detection. While the probability of reaching the trouble was low, the disruption was extreme. No new backends could start, and service restoration needed an immediate shutdown. Hence, add this to catch the next bug like it. The new check in RelationIdGetRelation() suffices to make autovacuum detect the bug in commit243e9b40f1that led to commit0bada39. This also checks in a number of similar places. It replaces each Assert(IsTransactionState()) that pertained to a conditional catalog read. No back-patch for now, but a back-patch of commit243e9b4should back-patch this, too. A back-patch could omit the src/test/regress changes, since back branches won't gain new index columns. Reported-by: Alexander Lakhin <exclusion@gmail.com> Discussion: https://postgr.es/m/20250410191830.0e.nmisch@google.com Discussion: https://postgr.es/m/10ec0bc3-5933-1189-6bb8-5dec4114558e@gmail.com
src/backend/utils/mb/README Encodings ========= conv.c: static functions and a public table for code conversion mbutils.c: public functions for the backend only. stringinfo_mb.c: public backend-only multibyte-aware stringinfo functions wstrcmp.c: strcmp for mb wstrncmp.c: strncmp for mb See also in src/common/: encnames.c: public functions for encoding names wchar.c: mostly static functions and a public table for mb string and multibyte conversion Introduction ------------ http://www.cprogramming.com/tutorial/unicode.html