Fix race condition at backend exit when deleting element in syncrep queue

When a backend exits, it gets deleted from the syncrep queue if present.
The queue was checked without SyncRepLock taken in exclusive mode, so it
would have been possible for a backend to remove itself after a WAL
sender already did the job.  Fix this issue based on a suggestion from
Fujii Masao, by first checking the queue without the lock.  Then, if the
backend is present in the queue, take the lock and perform an additional
lookup check before doing the element deletion.

Author: Dongming Liu
Reviewed-by: Kyotaro Horiguchi, Fujii Masao, Michael Paquier
Discussion: https://postgr.es/m/a0806273-8bbb-43b3-bbe1-c45a58f6ae21[email protected]
Backpatch-through: 9.4

diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index 08588bfcb04ae975621a556e6880d7e9d1054385..733ac9454912e5a0e83837eb48ed57290def0510 100644 (file)
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -304,10 +304,18 @@ SyncRepCancelWait(void)
 void
 SyncRepCleanupAtProcExit(void)
 {
+   /*
+    * First check if we are removed from the queue without the lock to not
+    * slow down backend exit.
+    */
    if (!SHMQueueIsDetached(&(MyProc->syncRepLinks)))
    {
        LWLockAcquire(SyncRepLock, LW_EXCLUSIVE);
-       SHMQueueDelete(&(MyProc->syncRepLinks));
+
+       /* maybe we have just been removed, so recheck */
+       if (!SHMQueueIsDetached(&(MyProc->syncRepLinks)))
+           SHMQueueDelete(&(MyProc->syncRepLinks));
+
        LWLockRelease(SyncRepLock);
    }
 }