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| author | Thomas Munro <tmunro@postgresql.org> | 2023-07-03 16:16:27 +1200 |
|---|---|---|
| committer | Thomas Munro <tmunro@postgresql.org> | 2023-07-04 09:04:35 +1200 |
| commit | 0cb1fb2c9bf8fdc27044082757cde79de1a8e482 (patch) | |
| tree | 5582efc9f7ae1bc0625219d4cf56ac54014eaaa9 /src/tutorial/basics.source | |
| parent | 6b488d5dc2fe4dc12e1ef15c0ea4c1a4e7170ae0 (diff) | |
| download | postgresql-0cb1fb2c9bf8fdc27044082757cde79de1a8e482.tar.gz postgresql-0cb1fb2c9bf8fdc27044082757cde79de1a8e482.zip | |
Fix race in SSI interaction with empty btrees.
When predicate-locking btrees, we have a special case for completely
empty btrees, since there is no page to lock. This was racy, because,
without buffer lock held, a matching key could be inserted between the
_bt_search() and the PredicateLockRelation() calls.
Fix, by rechecking _bt_search() after taking the relation-level SIREAD
lock, if using SERIALIZABLE isolation and an empty btree is discovered.
Back-patch to all supported releases. Fixes one aspect of bug #17949.
Reported-by: Artem Anisimov <artem.anisimov.255@gmail.com>
Reviewed-by: Dmitry Dolgov <9erthalion6@gmail.com>
Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi>
Discussion: https://postgr.es/m/17949-a0f17035294a55e2%40postgresql.org
Diffstat (limited to 'src/tutorial/basics.source')
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