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help / color / mirror / Atom feedFrom: Heikki Linnakangas <heikki.linnakangas@iki.fi>
To: pgsql-committers@lists.postgresql.org
Subject: pgsql: pg_resetwal: do not allow zero next multixact offset
Date: Mon, 27 Jul 2026 13:08:35 +0000
Message-ID: <E1woL4N-00000000WAP-3Iby@gemulon.postgresql.org> (raw)
pg_resetwal: do not allow zero next multixact offset
Offset 0 is the "invalid" marker in pg_multixact/offsets since offsets
went 64-bit and the allocator stopped skipping it. pg_resetwal could
still produce it via -O 0 or guessed control values, breaking the first
multixact created after the reset ("MultiXact n has invalid offset",
and vacuum of the affected table fails from then on). Reject -O 0 like
-m and -o already do, and guess 1 like initdb does.
Author: Zsolt Parragi <zsolt.parragi@percona.com>
Discussion: https://www.postgresql.org/message-id/CAN4CZFNoO6MUkg526TmA=mC_RjY2gp4VKCnvK6y12v3ppOkhJA@mail.gmail...
Backpatch-through: 19
Branch
------
REL_19_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/31974f64f029a29a6d7eeeb3f870030beee2066f
Modified Files
--------------
src/bin/pg_resetwal/pg_resetwal.c | 6 +++++-
src/bin/pg_resetwal/t/001_basic.pl | 4 ++++
2 files changed, 9 insertions(+), 1 deletion(-)
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To: pgsql-committers@postgresql.org
Cc: heikki.linnakangas@iki.fi, pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: pg_resetwal: do not allow zero next multixact offset
In-Reply-To: <E1woL4N-00000000WAP-3Iby@gemulon.postgresql.org>
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