--- libmalloc/libmalloc-409.81.2/tests/memory_pressure.c
+++ libmalloc/libmalloc-646.0.13/tests/memory_pressure.c
@@ -23,6 +23,7 @@
 	for (int t=0; t<100; t++) {
 		for (int i=0; i<cnt; i++) {
 			struct entry *p = calloc(1, sz);
+			T_QUIET; T_ASSERT_NOTNULL(p, "Failed to make allocation with size %zu", sz);
 			TAILQ_INSERT_TAIL(&head, p, next);
 		}
 		int i=0;
@@ -43,6 +44,7 @@
 		T_META_ENVVAR("MallocScribble=1"),
 		T_META_ENVVAR("MallocSpaceEfficient=1"),
 		T_META_ENVVAR("MallocMaxMagazines=1"),
+		T_META_TAG_VM_NOT_PREFERRED,
 		T_META_CHECK_LEAKS(false))
 {
 	dispatch_queue_t q = dispatch_queue_create("pressure queue", 0); // serial
@@ -57,6 +59,8 @@
 }
 
 T_DECL(small_mem_pressure, "small memory pressure thread",
+		T_META_TAG_VM_NOT_PREFERRED,
+		T_META_RUN_CONCURRENTLY(true),
 #if TARGET_OS_WATCH
 		T_META_TIMEOUT(TEST_TIMEOUT),
 #endif // TARGET_OS_WATCH
@@ -120,6 +124,7 @@
 #if TARGET_OS_WATCH
 		T_META_TIMEOUT(TEST_TIMEOUT),
 #endif // TARGET_OS_WATCH
+		T_META_TAG_VM_NOT_PREFERRED,
 		T_META_CHECK_LEAKS(false)) {
 	dispatch_group_t g = dispatch_group_create();
 	for (int i=0; i<16; i++) {
@@ -141,6 +146,8 @@
 }
 
 T_DECL(small_mem_pressure_multi, "test memory pressure in small on threads",
+		T_META_TAG_VM_NOT_PREFERRED,
+		T_META_RUN_CONCURRENTLY(true),
 #if TARGET_OS_WATCH
 		T_META_TIMEOUT(TEST_TIMEOUT),
 #endif // TARGET_OS_WATCH
@@ -168,7 +175,9 @@
 #if TARGET_OS_WATCH
 		T_META_TIMEOUT(TEST_TIMEOUT),
 #endif // TARGET_OS_WATCH
-		T_META_CHECK_LEAKS(false)) {
+		T_META_CHECK_LEAKS(false),
+	    T_META_TAG_VM_NOT_PREFERRED,
+	    T_META_RUN_CONCURRENTLY(true)) {
 	dispatch_group_t g = dispatch_group_create();
 	for (int i=0; i<30; i++) {
 		dispatch_group_async(g, dispatch_get_global_queue(0, 0), ^{