--- libmalloc/libmalloc-646.0.13/tests/scribble_tests.c
+++ /dev/null
@@ -1,146 +0,0 @@
-//
-//  scribble_tests.c
-//  libsystem_malloc
-//
-//  Created by Aaron Morrison on 7/14/23.
-//
-#include <stdlib.h>
-#include <darwintest.h>
-
-#include <malloc_private.h>
-
-#include "base.h"
-
-#define SCRIBBLE_ALLOC_BYTE 0xaa
-
-static bool memchk(void *ptr, uint8_t byte, size_t size)
-{
-	for (int i = 0; i < size; i++) {
-		if (((uint8_t*)ptr)[i] != byte) {
-			T_LOG("memchk: offset 0x%x in %p - expected 0x%02x, actual 0x%02x",
-					i, ptr, byte, ((uint8_t*)ptr)[i]);
-			return false;
-		}
-	}
-	return true;
-}
-
-// note that scribble seems to break leaks for szone malloc
-T_DECL(malloc_scribble_check, "check MallocScribble works",
-	T_META_TAG_XZONE,
-	T_META_ENVVAR("MallocScribble=1"),
-	T_META_ENVVAR("MallocProbGuard=0"),  // rdar://121458833
-	T_META_CHECK_LEAKS(false))
-{
-	// Ensure that TINY allocations are scribbled on allocation
-	// It would be nice to check that they're set to the scrabble value (0x55)
-	// on free, but we can't rely on that always working in an integration test
-	void *ptr = malloc(KiB(1));
-	T_EXPECT_TRUE(memchk(ptr, SCRIBBLE_ALLOC_BYTE, KiB(1)), "Scribble on malloc");
-	free(ptr);
-
-	// Realloc a TINY allocation into a SMALL allocation. The newly allocated
-	// bytes should be set to the scribble value, while the old bytes should
-	// stay at whatever we set them to (0x33 in this case)
-	ptr = malloc(KiB(4));
-	memset(ptr, 0x33, KiB(4));
-	ptr = realloc(ptr, KiB(8));
-	T_EXPECT_TRUE(memchk(ptr, 0x33, KiB(4)), "Memory rewritten on realloc");
-	T_EXPECT_TRUE(memchk((uint8_t*)ptr + KiB(4), SCRIBBLE_ALLOC_BYTE, KiB(4)),
-			"Scribble on realloc");
-	ptr = realloc(ptr, KiB(2));
-	T_EXPECT_TRUE(memchk(ptr, 0x33, KiB(2)), "realloc down");
-
-	free(ptr);
-
-	// Now test out LARGE (>32K) pointers
-	ptr = malloc(KiB(64));
-	T_EXPECT_TRUE(memchk(ptr, SCRIBBLE_ALLOC_BYTE, KiB(64)),
-			"Scribble on LARGE allocation");
-	free(ptr);
-
-	// Realloc a LARGE allocation, which may be done in-place. The new bytes
-	// should be the scribble value
-	ptr = malloc(KiB(64));
-	memset(ptr, 0x33, KiB(64));
-	ptr = realloc(ptr, KiB(128));
-	T_EXPECT_TRUE(memchk(ptr, 0x33, KiB(64)), "Memory retained on realloc");
-	T_EXPECT_TRUE(memchk((uint8_t*)ptr + KiB(64), SCRIBBLE_ALLOC_BYTE, KiB(64)),
-			 "Scribble on realloc");
-	ptr = realloc(ptr, KiB(48));
-	T_EXPECT_TRUE(memchk(ptr, 0x33, KiB(48)), "realloc down");
-	free(ptr);
-
-	// Now test out HUGE (>2M) pointers
-	ptr = malloc(MiB(4)); // 4M
-	T_EXPECT_TRUE(memchk(ptr, SCRIBBLE_ALLOC_BYTE, MiB(4)),
-			"Scribble on malloc HUGE");
-	free(ptr);
-
-	// Realloc HUGE allocation, same as above
-	ptr = malloc(MiB(4));
-	memset(ptr, 0x33, MiB(4));
-	ptr = realloc(ptr, MiB(8));
-	T_EXPECT_TRUE(memchk(ptr, 0x33, MiB(4)), "Memory retained on realloc");
-	T_EXPECT_TRUE(memchk((uint8_t*)ptr + MiB(4), SCRIBBLE_ALLOC_BYTE, MiB(4)),
-			"Scribble on realloc");
-	ptr = realloc(ptr, MiB(3));
-	T_EXPECT_TRUE(memchk(ptr, 0x33, MiB(3)), "realloc down");
-	free(ptr);
-
-	// Exhaust the early allocator and make sure that new allocations are still
-	// scribbled
-	for (int i = 0; i < 64; i++) {
-		ptr = malloc(64);
-		free(ptr);
-	}
-	ptr = malloc(64);
-	T_EXPECT_TRUE(memchk(ptr, SCRIBBLE_ALLOC_BYTE, 64), "Scribble on malloc");
-	free(ptr);
-
-	// Make sure that memory returned by calloc is zeroed, for all size classes
-	for (uint64_t s = 1; s < 0x4000000; s <<= 1) {
-		ptr = calloc(s, 1);
-		T_EXPECT_TRUE(memchk(ptr, 0, s), "Calloc should return zeroed memory");
-		free(ptr);
-	}
-
-	// Make sure memory returned by malloc_zone_malloc_with_options_np() is
-	// correct
-	ptr = malloc_zone_malloc_with_options_np(NULL, sizeof(void *), KiB(1), 0);
-	T_EXPECT_TRUE(memchk(ptr, SCRIBBLE_ALLOC_BYTE, KiB(1)),
-			"malloc_zone_malloc_with_options_np()");
-	free(ptr);
-
-	ptr = malloc_zone_malloc_with_options_np(NULL, sizeof(void *), KiB(1),
-			MALLOC_NP_OPTION_CLEAR);
-	T_EXPECT_TRUE(memchk(ptr, 0, KiB(1)),
-			"malloc_zone_malloc_with_options_np(MALLOC_NP_OPTION_CLEAR)");
-	free(ptr);
-
-	// Allocate and free many allocations smaller than the zero on free
-	// threshold (1024), in order to push several pages into the isolation zone.
-	// Then calloc those same allocations, to make sure that the memory is zeroed
-	const size_t num_ptrs = 256;
-	void **ptr_array = calloc(sizeof(void*), num_ptrs);
-	for (int i = 0; i < num_ptrs; i++) {
-		ptr_array[i] = malloc(512);
-		T_QUIET;
-		T_EXPECT_TRUE(memchk(ptr_array[i], SCRIBBLE_ALLOC_BYTE, 512),
-				"Scribble on malloc");
-	}
-	for (int i = 0; i < num_ptrs; i++) {
-		free(ptr_array[i]);
-		ptr_array[i] = NULL;
-	}
-	for (int i = 0; i < num_ptrs; i++) {
-		ptr_array[i] = calloc(512, 1);
-		T_QUIET;
-		T_EXPECT_TRUE(memchk(ptr_array[i], 0x00, 512),
-				"Calloc should return zeroed memory");
-	}
-	for (int i = 0; i < num_ptrs; i++) {
-		free(ptr_array[i]);
-		ptr_array[i] = NULL;
-	}
-}