--- libmalloc/libmalloc-374.40.6/tests/nano_tests.c
+++ libmalloc/libmalloc-166.251.2/tests/nano_tests.c
@@ -85,8 +85,6 @@
 
 static void *allocations[ALLOCATION_COUNT];
 
-T_GLOBAL_META(T_META_RUN_CONCURRENTLY(true));
-
 T_DECL(nano_active_test, "Test that Nano is activated",
 	   T_META_ENVVAR("MallocNanoZone=1"))
 {
@@ -319,8 +317,7 @@
 #define ALLOCS_PER_ARENA ((NANOV2_ARENA_SIZE)/256)
 
 T_DECL(overspill_arena, "force overspill of an arena",
-	   T_META_ENVVAR("MallocNanoZone=V2"),
-	   T_META_ENVVAR("MallocGuardEdges=all"))
+	   T_META_ENVVAR("MallocNanoZone=V2"))
 {
 #if CONFIG_NANOZONE
 	void **ptrs = calloc(ALLOCS_PER_ARENA, sizeof(void *));
@@ -342,10 +339,6 @@
 		if (current_ptr.fields.nano_arena != first_ptr.fields.nano_arena) {
 			break;
 		}
-
-		// Write to the pointer to ensure the containing block is not
-		// a guard block.
-		*(int *)ptrs[index] = 0;
 	}
 
 	// Free everything, which is a check that the book-keeping works across