--- libmalloc/libmalloc-140.1.1/tests/magazine_tiny_test.c
+++ libmalloc/libmalloc-792.80.2/tests/magazine_tiny_test.c
@@ -11,18 +11,25 @@
 #include "../src/magazine_tiny.c"
 #include "magazine_testing.h"
 
+// Stubs
+bool aggressive_madvise_enabled = DEFAULT_AGGRESSIVE_MADVISE_ENABLED;
+
+unsigned malloc_zero_on_free_sample_period = 0;
+malloc_zero_policy_t malloc_zero_policy = MALLOC_ZERO_POLICY_DEFAULT;
+
+T_GLOBAL_META(T_META_RUN_CONCURRENTLY(true), T_META_TAG_VM_PREFERRED,
+		T_META_TAG_NO_ALLOCATOR_OVERRIDE);
+
 static inline void
-test_rack_setup(rack_t *rack)
+tiny_test_rack_setup(rack_t *rack)
 {
-	memset(rack, 'a', sizeof(rack));
-	rack_init(rack, RACK_TYPE_TINY, 1, 0);
-	T_QUIET; T_ASSERT_NOTNULL(rack->magazines, "magazine initialisation");
+	test_rack_setup(rack, RACK_TYPE_TINY);
 }
 
 T_DECL(basic_tiny_alloc, "tiny rack init and alloc")
 {
 	struct rack_s rack;
-	test_rack_setup(&rack);
+	tiny_test_rack_setup(&rack);
 
 	void *ptr = tiny_malloc_should_clear(&rack, TINY_MSIZE_FOR_BYTES(32), false);
 	T_ASSERT_NOTNULL(ptr, "allocation");
@@ -37,7 +44,7 @@
 T_DECL(basic_tiny_teardown, "tiny rack init, alloc, teardown")
 {
 	struct rack_s rack;
-	test_rack_setup(&rack);
+	tiny_test_rack_setup(&rack);
 
 	void *ptr = tiny_malloc_should_clear(&rack, TINY_MSIZE_FOR_BYTES(32), false);
 	T_ASSERT_NOTNULL(ptr, "allocation");
@@ -57,13 +64,13 @@
 T_DECL(basic_tiny_free, "tiny free")
 {
 	struct rack_s rack;
-	test_rack_setup(&rack);
+	tiny_test_rack_setup(&rack);
 
 	void *ptr = tiny_malloc_should_clear(&rack, TINY_MSIZE_FOR_BYTES(32), false);
 	T_ASSERT_NOTNULL(ptr, "allocation");
 
 	// free doesn't return an error (unless we assert here)
-	free_tiny(&rack, ptr, TINY_REGION_FOR_PTR(ptr), 0);
+	free_tiny(&rack, ptr, TINY_REGION_FOR_PTR(ptr), 0, false);
 
 	size_t sz = tiny_size(&rack, ptr);
 	T_ASSERT_EQ((int)sz, 0, "allocation freed (sz == 0)");
@@ -72,7 +79,7 @@
 T_DECL(basic_tiny_shrink, "tiny rack shrink")
 {
 	struct rack_s rack;
-	test_rack_setup(&rack);
+	tiny_test_rack_setup(&rack);
 
 	void *ptr = tiny_malloc_should_clear(&rack, TINY_MSIZE_FOR_BYTES(64), false);
 	T_ASSERT_NOTNULL(ptr, "allocation");
@@ -89,43 +96,70 @@
 T_DECL(basic_tiny_realloc_in_place, "tiny rack realloc in place")
 {
 	struct rack_s rack;
-	test_rack_setup(&rack);
+	tiny_test_rack_setup(&rack);
 
+	// Allocate two blocks and free the second, then try to realloc() the first.
+	// This should extend in-place using the one-level death row cache that's
+	// occupied by the second block.
 	void *ptr = tiny_malloc_should_clear(&rack, TINY_MSIZE_FOR_BYTES(16), false);
 	T_ASSERT_NOTNULL(ptr, "allocation");
 
 	size_t sz = tiny_size(&rack, ptr);
 	T_ASSERT_EQ((int)sz, 16, "size == 16");
 
-	// Due to <rdar://problem/28032870>, we can't just do alloc+realloc here because
-	// the allocator won't see the remainder of the region as free (the
-	// mag_bytes_free_at_end section is marked as busy and realloc doesn't check
-	// for it).
-
-	// On top of that, <rdar://problem/28033016> means we can't do
-	// alloc+alloc+free+realloc because the free'd block gets put in the tiny cache
-	// and the realloc path *also* doesn't check that. That means to actually do a
-	// fast-path realloc you need to:
-
-	//   1. alloc three times (to get the blocks out of the free_at_end region)
-	//   2. free the logically consecutive block
-	//   3. free any other block, to get the consecutive block out of the tiny cache
-
 	void *ptr2 = tiny_malloc_should_clear(&rack, TINY_MSIZE_FOR_BYTES(16), false);
 	T_ASSERT_NOTNULL(ptr2, "allocation 2");
 	T_ASSERT_EQ_PTR(ptr2, (void *)((uintptr_t)ptr + 16), "sequential allocations");
+	free_tiny(&rack, ptr2, TINY_REGION_FOR_PTR(ptr2), 0, false);
 
-	void *ptr3 = tiny_malloc_should_clear(&rack, TINY_MSIZE_FOR_BYTES(16), false);
-	T_ASSERT_NOTNULL(ptr3, "allocation 3");
-
-	free_tiny(&rack, ptr2, TINY_REGION_FOR_PTR(ptr2), 0);
-	free_tiny(&rack, ptr3, TINY_REGION_FOR_PTR(ptr3), 0);
-
-	// attempt to realloc up to 32 bytes, this should happen in place
-	// as the rack is otherwise completely empty
+	// Attempt to realloc up to 32 bytes, this should happen in place
+	// because of the death-row cache.
 	boolean_t reallocd = tiny_try_realloc_in_place(&rack, ptr, sz, 32);
-	T_ASSERT_TRUE(reallocd, "realloced");
+	T_ASSERT_TRUE(reallocd, "realloced #1");
 
 	size_t nsz = tiny_size(&rack, ptr);
 	T_ASSERT_EQ((int)nsz, 32, "realloc size == 32");
+
+	// Try another realloc(). This should extend in place because the rest of
+	// the rack is empty.
+	reallocd = tiny_try_realloc_in_place(&rack, ptr, nsz, 64);
+	T_ASSERT_TRUE(reallocd, "realloced #2");
+	nsz = tiny_size(&rack, ptr);
+	T_ASSERT_EQ((int)nsz, 64, "realloc size == 64");
+
+	free_tiny(&rack, ptr, TINY_REGION_FOR_PTR(ptr), 0, false);
 }
+
+T_DECL(tiny_free_deallocate, "check tiny regions deallocate when empty")
+{
+	struct rack_s rack;
+	memset(&rack, 'a', sizeof(rack));
+	rack_init(&rack, RACK_TYPE_TINY, 1, 0);
+	// force recirc to be released when empty
+	recirc_retained_regions = 0;
+
+	magazine_t *mag = &rack.magazines[0];
+	T_ASSERT_EQ(mag->mag_last_region, NULL, "no regions before allocation");
+
+	void *ptr = tiny_malloc_should_clear(&rack, 1, false);
+	T_ASSERT_NE(ptr, NULL, "allocate");
+
+	region_t region = TINY_REGION_FOR_PTR(ptr);
+	mag_index_t mag_index = MAGAZINE_INDEX_FOR_TINY_REGION(region);
+	magazine_t *dest_mag = &(rack.magazines[mag_index]);
+	T_ASSERT_GE(mag_index, -1, "assert ptr not in recirc");
+
+	// Is to pass the recirc discriminant in tiny_free_try_recirc_to_depot
+	// which normally prevents recirc unless 1.5x of a region has been
+	// allocated in the magazine as a whole.
+	dest_mag->num_bytes_in_magazine = (5 * TINY_REGION_SIZE);
+
+	SZONE_MAGAZINE_PTR_LOCK(dest_mag);
+	tiny_free_no_lock(&rack, dest_mag, mag_index, region, ptr, 1, false);
+
+	T_ASSERT_EQ(mag->mag_last_region, NULL, "no regions after last free");
+
+	magazine_t *depot = &rack.magazines[DEPOT_MAGAZINE_INDEX];
+	T_ASSERT_EQ(depot->mag_num_objects, 0, "no objects in depot after last free");
+	T_ASSERT_EQ(depot->num_bytes_in_magazine, 0ul, "no region in depot after last free");
+}