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| author | Thomas Munro <tmunro@postgresql.org> | 2023-07-03 16:16:27 +1200 |
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| committer | Thomas Munro <tmunro@postgresql.org> | 2023-07-04 09:14:16 +1200 |
| commit | ae6d536ed0dcb5e29126975d4a07eb308fdc5cfa (patch) | |
| tree | e8ad10a2614d7d7f3e78654e3daafb9e30fb2f47 /src/tutorial/funcs.c | |
| parent | 5396b188c92213216248fa8f311c0f031a137e2a (diff) | |
| download | postgresql-ae6d536ed0dcb5e29126975d4a07eb308fdc5cfa.tar.gz postgresql-ae6d536ed0dcb5e29126975d4a07eb308fdc5cfa.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/funcs.c')
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