From 2daed3c02258e32fb2f0b25f3f0dc0461478de5b Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@peterzhu.ca>
Date: Fri, 9 Jan 2026 21:22:08 -0500
Subject: [ruby/mmtk] Clear slot when object is freed

https://github.com/ruby/mmtk/commit/87290e45b2
---
 gc/mmtk/mmtk.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/gc/mmtk/mmtk.c b/gc/mmtk/mmtk.c
index 0321053613..e58d88025b 100644
--- a/gc/mmtk/mmtk.c
+++ b/gc/mmtk/mmtk.c
@@ -330,6 +330,11 @@ rb_mmtk_call_obj_free(MMTk_ObjectReference object)
     }
 
     rb_gc_obj_free(objspace, obj);
+
+    // TODO: uncomment this when done debugging
+// #ifdef MMTK_DEBUG
+    memset((void *)obj, 0, rb_gc_impl_obj_slot_size(obj));
+// #endif
 }
 
 static size_t
-- 
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