--- /dev/null
+++ libmalloc/libmalloc-521.120.7/tests/malloc_create_purgeable_zone.c
@@ -0,0 +1,52 @@
+//
+//  malloc_create_purgeable_zone.c
+//  libmalloc
+//
+//  Test for creating a purgeable zone while concurrently adding/removing other zones
+//
+
+#include <darwintest.h>
+#include <malloc/malloc.h>
+
+#define N_ZONE_CREATION_THREADS 8
+
+static void *
+make_purgeable_thread(void *arg)
+{
+	T_LOG("enable PGM");
+	malloc_zone_t *purgeable_zone = malloc_default_purgeable_zone();
+	T_ASSERT_NOTNULL(purgeable_zone, "malloc_default_purgeable_zone returned NULL");
+
+	return NULL;
+}
+
+static void *
+zone_thread(void *arg)
+{
+	vm_size_t start_size = (vm_size_t)arg;
+	while (1) {
+		malloc_zone_t *zone = malloc_create_zone(start_size, 0);
+		malloc_destroy_zone(zone);
+	}
+	return NULL;
+}
+
+T_DECL(malloc_create_purgeable_zone, "create a purgeable zone while constantly registering zones",
+		T_META_TAG_XZONE)
+{
+	pthread_t zone_threads[N_ZONE_CREATION_THREADS];
+	for (int i = 0; i < N_ZONE_CREATION_THREADS; i++) {
+		vm_size_t zone_start_size = 1000;
+		pthread_create(&zone_threads[i], NULL, zone_thread, (void *)zone_start_size);
+	}
+
+	usleep(50);
+
+	pthread_t purgeable_thread;
+	pthread_create(&purgeable_thread, NULL, make_purgeable_thread, NULL);
+	pthread_join(purgeable_thread, NULL);
+
+	usleep(500);
+
+	T_PASS("finished without crashing");
+}