https://git.ruby-lang.org/ruby.git/commit/?id=4a588e70b8

From 4a588e70b88028b3121babc43a26de0d13bdbb03 Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Thu, 24 Sep 2020 17:06:33 +0900
Subject: sync rb_gc_register_mark_object()

rb_vm_t::mark_object_ary is global resource so we need to
synchronize to access it.

diff --git a/gc.c b/gc.c
index d9c8731..fcb9c64 100644
--- a/gc.c
+++ b/gc.c
@@ -7347,15 +7347,19 @@ rb_gc_force_recycle(VALUE obj) https://github.com/ruby/ruby/blob/trunk/gc.c#L7347
 void
 rb_gc_register_mark_object(VALUE obj)
 {
-    VALUE ary_ary = GET_VM()->mark_object_ary;
-    VALUE ary = rb_ary_last(0, 0, ary_ary);
+    RB_VM_LOCK_ENTER();
+    {
+        VALUE ary_ary = GET_VM()->mark_object_ary;
+        VALUE ary = rb_ary_last(0, 0, ary_ary);
 
-    if (ary == Qnil || RARRAY_LEN(ary) >= MARK_OBJECT_ARY_BUCKET_SIZE) {
-	ary = rb_ary_tmp_new(MARK_OBJECT_ARY_BUCKET_SIZE);
-	rb_ary_push(ary_ary, ary);
-    }
+        if (ary == Qnil || RARRAY_LEN(ary) >= MARK_OBJECT_ARY_BUCKET_SIZE) {
+            ary = rb_ary_tmp_new(MARK_OBJECT_ARY_BUCKET_SIZE);
+            rb_ary_push(ary_ary, ary);
+        }
 
-    rb_ary_push(ary, obj);
+        rb_ary_push(ary, obj);
+    }
+    RB_VM_LOCK_LEAVE();
 }
 
 void
-- 
cgit v0.10.2


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