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help / color / mirror / Atom feedFrom: Heikki Linnakangas <[email protected]>
To: [email protected]
Subject: pgsql: Fix self-deadlock when replaying WAL generated by older minor ve
Date: Wed, 27 May 2026 09:06:36 +0000
Message-ID: <[email protected]> (raw)
Fix self-deadlock when replaying WAL generated by older minor version
Commit 77dff5d937 introduced a SimpleLruWriteAll() call when replaying
multixact WAL records generated by older minor versions. However,
SimpleLruWriteAll() acquires the SLRU lock and on v16 and below, it's
called while already holding the lock, leading to self-deadlock.
Version 17 and 18 did not have that problem, because in those versions
the lock is acquired later in the function.
To fix, acquire MultiXactOffsetSLRULock later in RecordNewMultiXact(),
at the same place where it's acquired on version 17 and 18.
Author: Andrey Borodin <[email protected]>
Reported-by: Radim Marek <[email protected]>
Discussion: https://www.postgresql.org/message-id/[email protected]
Backpatch-through: 14-16
Branch
------
REL_16_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/42a3194e548349b658a808347df3d3d5e6b968af
Modified Files
--------------
src/backend/access/transam/multixact.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
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Subject: Re: pgsql: Fix self-deadlock when replaying WAL generated by older minor ve
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