diff --git a/contrib/pg_buffercache/pg_buffercache_pages.c b/contrib/pg_buffercache/pg_buffercache_pages.c
index 5a3d78d03d5..7d26dbeb7e1 100644
--- a/contrib/pg_buffercache/pg_buffercache_pages.c
+++ b/contrib/pg_buffercache/pg_buffercache_pages.c
@@ -526,8 +526,16 @@ pg_buffercache_numa_pages(PG_FUNCTION_ARGS)
 		values[1] = Int64GetDatum(fctx->record[i].page_num);
 		nulls[1] = false;
 
-		values[2] = Int32GetDatum(fctx->record[i].numa_node);
-		nulls[2] = false;
+		/* status is valid node number */
+		if (fctx->record[i].numa_node >= 0)
+		{
+			values[2] = Int32GetDatum(fctx->record[i].numa_node);
+			nulls[2] = false;
+		} else {
+			/* some kind of error (e.g. pages moved to swap) */
+			values[2] = (Datum) 0;
+			nulls[2] = true;
+		}
 
 		/* Build and return the tuple. */
 		tuple = heap_form_tuple(fctx->tupdesc, values, nulls);
diff --git a/src/backend/storage/ipc/shmem.c b/src/backend/storage/ipc/shmem.c
index ff3a738c19c..21e12e2f527 100644
--- a/src/backend/storage/ipc/shmem.c
+++ b/src/backend/storage/ipc/shmem.c
@@ -603,7 +603,7 @@ pg_get_shmem_allocations_numa(PG_FUNCTION_ARGS)
 	InitMaterializedSRF(fcinfo, 0);
 
 	max_nodes = pg_numa_get_max_node();
-	nodes = palloc(sizeof(Size) * (max_nodes + 1));
+	nodes = palloc(sizeof(Size) * (max_nodes + 2));
 
 	/*
 	 * Shared memory allocations can vary in size and may not align with OS
@@ -639,7 +639,6 @@ pg_get_shmem_allocations_numa(PG_FUNCTION_ARGS)
 	hash_seq_init(&hstat, ShmemIndex);
 
 	/* output all allocated entries */
-	memset(nulls, 0, sizeof(nulls));
 	while ((ent = (ShmemIndexEnt *) hash_seq_search(&hstat)) != NULL)
 	{
 		int			i;
@@ -688,22 +687,33 @@ pg_get_shmem_allocations_numa(PG_FUNCTION_ARGS)
 			elog(ERROR, "failed NUMA pages inquiry status: %m");
 
 		/* Count number of NUMA nodes used for this shared memory entry */
-		memset(nodes, 0, sizeof(Size) * (max_nodes + 1));
+		memset(nodes, 0, sizeof(Size) * (max_nodes + 2));
 
 		for (i = 0; i < shm_ent_page_count; i++)
 		{
 			int			s = pages_status[i];
 
 			/* Ensure we are adding only valid index to the array */
-			if (s < 0 || s > max_nodes)
+			if (s >= 0 && s <= max_nodes)
 			{
-				elog(ERROR, "invalid NUMA node id outside of allowed range "
-					 "[0, " UINT64_FORMAT "]: %d", max_nodes, s);
+				/* valid NUMA node */
+				nodes[s]++;
+				continue;
+			}
+			else if (s == -2)
+			{
+				/* -2 means ENOENT (e.g. page was moved to swap) */
+				nodes[max_nodes + 1]++;
+				continue;
 			}
 
-			nodes[s]++;
+			elog(ERROR, "invalid NUMA node id outside of allowed range "
+				 "[0, " UINT64_FORMAT "]: %d", max_nodes, s);
 		}
 
+		/* no NULLs for regular nodes */
+		memset(nulls, 0, sizeof(nulls));
+
 		/*
 		 * Add one entry for each NUMA node, including those without allocated
 		 * memory for this segment.
@@ -717,6 +727,14 @@ pg_get_shmem_allocations_numa(PG_FUNCTION_ARGS)
 			tuplestore_putvalues(rsinfo->setResult, rsinfo->setDesc,
 								 values, nulls);
 		}
+
+		/* The last entry is used for pages without a NUMA node. */
+		nulls[1] = true;
+		values[0] = CStringGetTextDatum(ent->key);
+		values[2] = Int64GetDatum(nodes[max_nodes + 1] * os_page_size);
+
+		tuplestore_putvalues(rsinfo->setResult, rsinfo->setDesc,
+							 values, nulls);
 	}
 
 	LWLockRelease(ShmemIndexLock);