diff options
| author | Thomas Munro <tmunro@postgresql.org> | 2023-07-03 16:16:27 +1200 |
|---|---|---|
| committer | Thomas Munro <tmunro@postgresql.org> | 2023-07-04 09:21:33 +1200 |
| commit | fe88497b4d0b0105aa4c3d3ba75ca988058a0381 (patch) | |
| tree | e9ac879a7e1b8867f8decd9919b4deaf03d40126 /src/backend/tcop/postgres.c | |
| parent | bec0dcb62963403490abdb89983f3472377c828e (diff) | |
| download | postgresql-fe88497b4d0b0105aa4c3d3ba75ca988058a0381.tar.gz postgresql-fe88497b4d0b0105aa4c3d3ba75ca988058a0381.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/backend/tcop/postgres.c')
0 files changed, 0 insertions, 0 deletions