Horton

Fix memory leak on DSM slot exhaustion.

Thomas Munro <tmunro@postgresql.org>

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Commit: 93745f1e019543fe7b742d0c5e971aad8d08fd56
Author: Thomas Munro <tmunro@postgresql.org>
Date: 2020-02-01T01:29:13Z
Releases: 13.0 
Fix memory leak on DSM slot exhaustion.

If we attempt to create a DSM segment when no slots are available,
we should return the memory to the operating system.  Previously
we did that if the DSM_CREATE_NULL_IF_MAXSEGMENTS flag was
passed in, but we didn't do it if an error was raised.  Repair.

Back-patch to 9.4, where DSM segments arrived.

Author: Thomas Munro
Reviewed-by: Robert Haas
Reported-by: Julian Backes
Discussion: https://postgr.es/m/CA%2BhUKGKAAoEw-R4om0d2YM4eqT1eGEi6%3DQot-3ceDR-SLiWVDw%40mail.gmail.com

Files

PathChange+/−
src/backend/storage/ipc/dsm.c modified +8 −9

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