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commit    e980ec7c80713e645e08b74e126badb1ca5cecfa
Author:   Robert Haas <rhaas@postgresql.org>
Date:     Mon Mar 31 18:32:12 2014 +0000
First released in: 9.4.0, 9.2.9, 9.3.5

    Mark FastPathStrongRelationLocks volatile.
    
    Otherwise, the compiler might decide to move modifications to data
    within this structure outside the enclosing SpinLockAcquire /
    SpinLockRelease pair, leading to shared memory corruption.
    
    This may or may not explain a recent lmgr-related buildfarm failure
    on prairiedog, but it needs to be fixed either way.


 src/backend/storage/lmgr/lock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index b7a5e457448..3566208904c 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -237,7 +237,7 @@ typedef struct
 	uint32		count[FAST_PATH_STRONG_LOCK_HASH_PARTITIONS];
 } FastPathStrongRelationLockData;
 
-FastPathStrongRelationLockData *FastPathStrongRelationLocks;
+volatile FastPathStrongRelationLockData *FastPathStrongRelationLocks;
 
 
 /*


[parent: 6a63dda4c2a0]