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authorNoah Misch <noah@leadboat.com>2024-04-29 10:24:56 -0700
committerNoah Misch <noah@leadboat.com>2024-04-29 10:24:59 -0700
commit92685c389d5416f87553bfb80205d79d5670a695 (patch)
tree942af99458e5b2bae8cac6eaea0cefe33108438e /src/backend/access/gist/gistvalidate.c
parentb19255ca66f74fe9f8d0372db7d644d0bb4d6ac9 (diff)
downloadpostgresql-92685c389d5416f87553bfb80205d79d5670a695.tar.gz
postgresql-92685c389d5416f87553bfb80205d79d5670a695.zip
Close race condition between datfrozen and relfrozen updates.
vac_update_datfrozenxid() did multiple loads of relfrozenxid and relminmxid from buffer memory, and it assumed each would get the same value. Not so if a concurrent vac_update_relstats() did an inplace update. Commit 2d2e40e3befd8b9e0d2757554537345b15fa6ea2 fixed the same kind of bug in vac_truncate_clog(). Today's bug could cause the rel-level field and XIDs in the rel's rows to precede the db-level field. A cluster having such values should VACUUM affected tables. Back-patch to v12 (all supported versions). Discussion: https://postgr.es/m/20240423003956.e7.nmisch@google.com
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