From f9b2cc8daea1cd0462e9455736237da0f7f00a3d Mon Sep 17 00:00:00 2001 From: Heikki Linnakangas Date: Thu, 4 Dec 2025 16:05:13 +0200 Subject: [PATCH 1/1] Fix setting next multixid's offset at offset wraparound --- src/backend/access/transam/multixact.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/src/backend/access/transam/multixact.c b/src/backend/access/transam/multixact.c index 27f02faec80..8ed3fd9d071 100644 --- a/src/backend/access/transam/multixact.c +++ b/src/backend/access/transam/multixact.c @@ -909,6 +909,7 @@ RecordNewMultiXact(MultiXactId multi, MultiXactOffset offset, int64 next_pageno; int next_entryno; MultiXactOffset *next_offptr; + MultiXactOffset next_offset; LWLock *lock; LWLock *prevlock = NULL; @@ -976,11 +977,15 @@ RecordNewMultiXact(MultiXactId multi, MultiXactOffset offset, next_offptr += next_entryno; } - if (*next_offptr != offset + nmembers) + /* Like in GetNewMultiXactId(), skip over offset 0 */ + next_offset = offset + nmembers; + if (next_offset == 0) + next_offset = 1; + if (*next_offptr != next_offset) { /* should already be set to the correct value, or not at all */ Assert(*next_offptr == 0); - *next_offptr = offset + nmembers; + *next_offptr = next_offset; MultiXactOffsetCtl->shared->page_dirty[slotno] = true; } -- 2.47.3