| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | pgsql-committers(at)lists(dot)postgresql(dot)org |
| Subject: | pgsql: Fix off-by-one in LimitAdditionalPins() |
| Date: | 2023-07-25 03:24:11 |
| Message-ID: | E1qO8eg-001Cz7-9x@gemulon.postgresql.org |
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| Thread: | |
| Lists: | pgsql-committers |
Fix off-by-one in LimitAdditionalPins()
Due to the bug LimitAdditionalPins() could return 0, violating
LimitAdditionalPins()'s API ("One additional pin is always allowed"). This
could be hit when setting shared_buffers very low and using a fair amount of
concurrency.
This bug was introduced in 31966b151e6a.
Author: "Anton A. Melnikov" <aamelnikov(at)inbox(dot)ru>
Reported-by: "Anton A. Melnikov" <aamelnikov(at)inbox(dot)ru>
Reported-by: Victoria Shepard
Discussion: https://postgr.es/m/ae46f2fb-5586-3de0-b54b-1bb0f6410ebd@inbox.ru
Backpatch: 16-
Branch
------
REL_16_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/bd2f46c6559ddcafe7bae5015ac45b69bc014067
Modified Files
--------------
src/backend/storage/buffer/bufmgr.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
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