From d508c3d61837f4f37100895b02d38d0df8de6a14 Mon Sep 17 00:00:00 2001
From: Daan Leijen <daan@microsoft.com>
Date: Mon, 20 Dec 2021 12:33:54 -0800
Subject: [PATCH] ensure in debug mode that all allocated block are initialized
 with MI_DEBUG_UNINIT (issue #501)

---
 src/page.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/page.c b/src/page.c
index c0659395..3368bad1 100644
--- a/src/page.c
+++ b/src/page.c
@@ -621,7 +621,11 @@ static void mi_page_init(mi_heap_t* heap, mi_page_t* page, size_t block_size, mi
   page->keys[0] = _mi_heap_random_next(heap);
   page->keys[1] = _mi_heap_random_next(heap);
   #endif
+  #if MI_DEBUG > 0
+  page->is_zero = false; // ensure in debug mode we initialize with MI_DEBUG_UNINIT, see issue #501
+  #else
   page->is_zero = page->is_zero_init;
+  #endif
 
   mi_assert_internal(page->capacity == 0);
   mi_assert_internal(page->free == NULL);