Restore lock level to set vacuum flags

alvherre · alvherre · commit 9aa91cb33b70 · 2021-11-11T11:03:29.000-03:00
Commit 2783898 mistakenly reduced the lock level from exclusive to shared that is acquired to set PGPROC->statusFlags; this was reverted by dcfff74, but failed to do so in one spot. Fix it. Backpatch to 14. Noted by Andres Freund. Discussion: https://postgr.es/m/20211111020724.ggsfhcq3krq5r4hb@alap3.anarazel.de
diff --git a/src/backend/replication/slot.c b/src/backend/replication/slot.c
@@ -511,7 +511,7 @@ ReplicationSlotRelease(void)
 	MyReplicationSlot = NULL;
 
 	/* might not have been set when we've been a plain slot */
-	LWLockAcquire(ProcArrayLock, LW_SHARED);
+	LWLockAcquire(ProcArrayLock, LW_EXCLUSIVE);
 	MyProc->statusFlags &= ~PROC_IN_LOGICAL_DECODING;
 	ProcGlobal->statusFlags[MyProc->pgxactoff] = MyProc->statusFlags;
 	LWLockRelease(ProcArrayLock);
