https://git.ruby-lang.org/ruby.git/commit/?id=7f7c3a0a75

From 7f7c3a0a75c48b45ce186c9e2b229ab3edf1473d Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Fri, 26 Nov 2021 11:37:28 +0900
Subject: initialize allocated memory by VWA for assertions

When `RGENGC_CHECK_MODE` is enable, `obj_memsize_of` is called
in `newobj_init` and it expect the memory is zero-cleared.
---
 gc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gc.c b/gc.c
index e0ba25860ca..d3dc51f2213 100644
--- a/gc.c
+++ b/gc.c
@@ -2354,6 +2354,10 @@ ractor_cached_free_region(rb_objspace_t *objspace, rb_ractor_t *cr, size_t size_ https://github.com/ruby/ruby/blob/trunk/gc.c#L2354
         VALUE obj = (VALUE)p;
         cache->freelist = p->as.free.next;
         asan_unpoison_object(obj, true);
+#if RGENGC_CHECK_MODE
+        // zero clear
+        MEMZERO((char *)obj, char, size_pool_slot_size(size_pool_idx));
+#endif
         return obj;
     }
     else {
-- 
cgit v1.2.1


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