--- libmalloc/libmalloc-409.40.6/tests/memory_pressure.c
+++ libmalloc/libmalloc-283.40.1/tests/memory_pressure.c
@@ -34,87 +34,6 @@
 		}
 	}
 }
-
-T_DECL(tiny_mem_pressure, "tiny memory pressure",
-#if TARGET_OS_WATCH
-		T_META_TIMEOUT(TEST_TIMEOUT),
-#endif // TARGET_OS_WATCH
-		T_META_ENVVAR("MallocDebugReport=stderr"),
-		T_META_ENVVAR("MallocScribble=1"),
-		T_META_ENVVAR("MallocSpaceEfficient=1"),
-		T_META_ENVVAR("MallocMaxMagazines=1"),
-		T_META_CHECK_LEAKS(false))
-{
-	dispatch_queue_t q = dispatch_queue_create("pressure queue", 0); // serial
-	dispatch_async(q, ^{
-		while (1) {
-			malloc_zone_pressure_relief(0, 0);
-			usleep(100000);
-		}
-	});
-	stress(128, 50000);
-	T_PASS("didn't crash");
-}
-
-T_DECL(small_mem_pressure, "small memory pressure thread",
-#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"),
-		T_META_CHECK_LEAKS(false))
-{
-	dispatch_queue_t q = dispatch_queue_create("pressure queue", 0); // serial
-	dispatch_async(q, ^{
-		while (1) {
-			malloc_zone_pressure_relief(0, 0);
-			usleep(10000);
-		}
-	});
-	stress(512, 20000);
-	T_PASS("didn't crash");
-}
-
-// Disabled until rdar://83904507 is fixed
-//
-// Need to compile the test out entirely because T_META_MAYFAIL doesn't handle
-// test crashes - rdar://86164532
-#if 0
-
-T_DECL(medium_mem_pressure, "medium memory pressure thread",
-#if TARGET_OS_WATCH
-		T_META_TIMEOUT(TEST_TIMEOUT),
-#endif // TARGET_OS_WATCH
-		T_META_ENVVAR("MallocDebugReport=stderr"),
-		T_META_ENVVAR("MallocScribble=1"),
-		T_META_ENVVAR("MallocSpaceEfficient=1"),
-		T_META_ENVVAR("MallocMaxMagazines=1"),
-		T_META_MAYFAIL("Disabled until rdar://83904507 is fixed"),
-		T_META_CHECK_LEAKS(false))
-{
-	dispatch_queue_t q = dispatch_queue_create("pressure queue", 0); // serial
-	dispatch_async(q, ^{
-		while (1) {
-			malloc_zone_pressure_relief(0, 0);
-			usleep(100000);
-		}
-	});
-	stress(64*1024, 1000);
-	T_PASS("didn't crash");
-}
-
-#endif
 
 T_DECL(tiny_mem_pressure_multi, "test memory pressure in tiny on threads",
 #if TARGET_OS_WATCH