0001-Fix-setting-next-multixid-s-offset-at-offset-wraparo.patch
text/x-patch
Filename: 0001-Fix-setting-next-multixid-s-offset-at-offset-wraparo.patch
Type: text/x-patch
Part: 0
Patch
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Format: format-patch
Series: patch 0001
Subject: Fix setting next multixid's offset at offset wraparound
| File | + | − |
|---|---|---|
| src/backend/access/transam/multixact.c | 7 | 2 |
From f9b2cc8daea1cd0462e9455736237da0f7f00a3d Mon Sep 17 00:00:00 2001
From: Heikki Linnakangas <heikki.linnakangas@iki.fi>
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