diff --git a/includes/memhub.vp b/includes/memhub.vp
index a3b9dcd..2d94ac0 100644
--- a/includes/memhub.vp
+++ b/includes/memhub.vp
@@ -890,6 +890,14 @@ class MemBuddy(MemManager):
                     bv3: t.CUInt8T = (t.CUInt8T | t.CPtr)(t.CVoid(p + t.CUInt64T(bi3), t.CPtr))[0]
                     stdio.printf("%02X ", t.CUInt32T(bv3))
                     bi3 += 1
+                # 越界区（ptr+size 起 24 字节）：0x00=被写穿 0xCD=未写 其它=写入值，
+                # 用于判断写入者写多长、往哪个方向
+                stdio.printf("越界区: ")
+                bj3: t.CInt = 0
+                while bj3 < 24:
+                    bvj: t.CUInt8T = (t.CUInt8T | t.CPtr)(t.CVoid(p + s + t.CUInt64T(bj3), t.CPtr))[0]
+                    stdio.printf("%02X ", t.CUInt32T(bvj))
+                    bj3 += 1
                 stdio.printf("\n")
                 stdlib.exit(1)
             i += 1