--- libmalloc/libmalloc-374.100.5/tests/memory_pressure.c
+++ libmalloc/libmalloc-474.0.13/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 %d", sz);
 			TAILQ_INSERT_TAIL(&head, p, next);
 		}
 		int i=0;
@@ -60,7 +61,16 @@
 #if TARGET_OS_WATCH
 		T_META_TIMEOUT(TEST_TIMEOUT),
 #endif // TARGET_OS_WATCH
+#if TARGET_OS_OSX
+		T_META_ALL_VALID_ARCHS(true), // test Rosetta
+		// darwintest multi-arch support relies on the first line of stderr
+		// being reserved for arch(1) complaining about a given slice being
+		// unsupported, so we can only put the malloc debug reporting on stderr
+		// when we don't need that
+		T_META_ENVVAR("MallocDebugReport=none"),
+#else // TARGET_OS_OSX
 		T_META_ENVVAR("MallocDebugReport=stderr"),
+#endif // TARGET_OS_OSX
 		T_META_ENVVAR("MallocScribble=1"),
 		T_META_ENVVAR("MallocSpaceEfficient=1"),
 		T_META_ENVVAR("MallocMaxMagazines=1"),