https://git.ruby-lang.org/ruby.git/commit/?id=61236770e6

From 61236770e6cc41f1364dc04249d845def03d9f37 Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Fri, 18 Dec 2020 17:49:22 +0900
Subject: need to sync gc_finalize_deferred

gc_finalize_deferred() runs finalizers and it accesses objspace,
so it need to sync.

diff --git a/gc.c b/gc.c
index 0c82179..cb7b8af 100644
--- a/gc.c
+++ b/gc.c
@@ -3725,9 +3725,15 @@ static void https://github.com/ruby/ruby/blob/trunk/gc.c#L3725
 gc_finalize_deferred(void *dmy)
 {
     rb_objspace_t *objspace = dmy;
-    if (ATOMIC_EXCHANGE(finalizing, 1)) return;
-    finalize_deferred(objspace);
-    ATOMIC_SET(finalizing, 0);
+
+    RB_VM_LOCK_ENTER();
+    {
+        rb_objspace_t *objspace = dmy;
+        if (ATOMIC_EXCHANGE(finalizing, 1)) return;
+        finalize_deferred(objspace);
+        ATOMIC_SET(finalizing, 0);
+    }
+    RB_VM_LOCK_LEAVE();
 }
 
 static void
-- 
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