pgsql: Fix multixact members truncation at page boundary - Mailing list pgsql-committers

Fix multixact members truncation at page boundary

Like in PerformOffsetsTruncation() and e.g. in TruncateSUBTRANS(),
need to step back to previous page at page boundary, to avoid passing
a cutoff page to SimpleLruTruncate() that hasn't been created
yet. Otherwise you can get a bogus 'LOG: could not truncate directory
"pg_multixact/members": apparent wraparound' message in the log.

Reported-by: Noah Misch <noah@leadboat.com>
Discussion: https://www.postgresql.org/message-id/20260827231757.78.noahmisch@microsoft.com
Backpatch-through: 19

Branch
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REL_19_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/d8408e8d6823036bb88310b36eed8d9607220847

Modified Files
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src/backend/access/transam/multixact.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)