--- libmalloc/libmalloc-374.40.6/tests/magazine_rack.c
+++ libmalloc/libmalloc-283/tests/magazine_rack.c
@@ -33,90 +33,3 @@
 	rack_destroy(&rack);
 	T_ASSERT_NULL(rack.magazines, "magazine deinit");
 }
-
-void *
-pressure_thread(void *arg)
-{
-	T_LOG("pressure thread started\n");
-	while (1) {
-		malloc_zone_pressure_relief(0, 0);
-	}
-}
-
-void *
-thread(void *arg)
-{
-	uintptr_t sz = (uintptr_t)arg;
-	T_LOG("thread started (allocation size: %lu bytes)\n", sz);
-	void *temp = malloc(sz);
-
-	uint64_t c = 100;
-	while (c-- > 0) {
-		uint32_t num = arc4random_uniform(100000);
-		void **allocs = malloc(sizeof(void *) * num);
-
-		for (int i=0; i<num; i++) {
-			allocs[i] = malloc(sz);
-		}
-		for (int i=0; i<num; i++) {
-			free(allocs[num - 1 - i]);
-		}
-		free((void *)allocs);
-	}
-	free(temp);
-	return NULL;
-}
-
-T_DECL(rack_tiny_region_remove, "exercise region deallocation race (rdar://66713029)")
-{
-	pthread_t p1;
-	pthread_create(&p1, NULL, pressure_thread, NULL);
-
-	const int threads = 8;
-	pthread_t p[threads];
-
-	for (int i=0; i<threads; i++) {
-		pthread_create(&p[i], NULL, thread, (void *)128);
-	}
-	for (int i=0; i<threads; i++) {
-		pthread_join(p[i], NULL);
-	}
-	T_PASS("finished without crashing");
-}
-
-T_DECL(rack_small_region_remove, "exercise region deallocation race (rdar://66713029)")
-{
-	pthread_t p1;
-	pthread_create(&p1, NULL, pressure_thread, NULL);
-
-	const int threads = 8;
-	pthread_t p[threads];
-
-	for (int i=0; i<threads; i++) {
-		pthread_create(&p[i], NULL, thread, (void *)1024);
-	}
-	for (int i=0; i<threads; i++) {
-		pthread_join(p[i], NULL);
-	}
-	T_PASS("finished without crashing");
-}
-
-T_DECL(rack_medium_region_remove, "exercise region deallocation race (rdar://66713029)",
-	   T_META_ENVVAR("MallocMediumZone=1"),
-	   T_META_ENVVAR("MallocMediumActivationThreshold=1"),
-	   T_META_ENABLED(CONFIG_MEDIUM_ALLOCATOR))
-{
-	pthread_t p1;
-	pthread_create(&p1, NULL, pressure_thread, NULL);
-
-	const int threads = 8;
-	pthread_t p[threads];
-
-	for (int i=0; i<threads; i++) {
-		pthread_create(&p[i], NULL, thread, (void *)65536);
-	}
-	for (int i=0; i<threads; i++) {
-		pthread_join(p[i], NULL);
-	}
-	T_PASS("finished without crashing");
-}