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" <aamelni...@inbox.ru> Reported-by: "Anton A. Melnikov" <aamelni...@inbox.ru> Reported-by: Victoria Shepard Discussion: https://postgr.es/m/ae46f2fb-5586-3de0-b54b-1bb0f6410...@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(-)