From 642798eeca806c999332ed3d02ed57a7852f7f1f Mon Sep 17 00:00:00 2001
From: John Hawthorn <john@hawthorn.email>
Date: Sat, 7 Jun 2025 22:23:52 -0700
Subject: Add write barriers on Hash#rehash

---
 hash.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hash.c b/hash.c
index 3669f55d50..01d3e796ec 100644
--- a/hash.c
+++ b/hash.c
@@ -1939,6 +1939,9 @@ rb_hash_rehash_i(VALUE key, VALUE value, VALUE arg)
     else {
         st_insert(RHASH_ST_TABLE(arg), (st_data_t)key, (st_data_t)value);
     }
+
+    RB_OBJ_WRITTEN(arg, Qundef, key);
+    RB_OBJ_WRITTEN(arg, Qundef, value);
     return ST_CONTINUE;
 }
 
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