https://git.ruby-lang.org/ruby.git/commit/?id=af2471365f

From af2471365fedaf89759eb00f87164fbaa0afaa39 Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Wed, 21 Oct 2020 22:56:35 +0900
Subject: refactoring rb_ractor_confirm_belonging()

rb_ractor_belonging() returns 0 only if it has sharable flag.
rb_ractor_confirm_belonging() checks rb_ractor_shareable_p()
if the belonging ractor id is different from current ractor id.

diff --git a/ractor.h b/ractor.h
index 50c16ff..e3adeb8 100644
--- a/ractor.h
+++ b/ractor.h
@@ -257,7 +257,7 @@ rb_ractor_setup_belonging(VALUE obj) https://github.com/ruby/ruby/blob/trunk/ractor.h#L257
 static inline uint32_t
 rb_ractor_belonging(VALUE obj)
 {
-    if (rb_ractor_shareable_p(obj)) {
+    if (SPECIAL_CONST_P(obj) || RB_OBJ_SHAREABLE_P(obj)) {
         return 0;
     }
     else {
@@ -277,8 +277,13 @@ rb_ractor_confirm_belonging(VALUE obj) https://github.com/ruby/ruby/blob/trunk/ractor.h#L277
         }
     }
     else if (UNLIKELY(id != rb_ractor_current_id())) {
-        rp(obj);
-        rb_bug("rb_ractor_confirm_belonging object-ractor id:%u, current-ractor id:%u", id, rb_ractor_current_id());
+        if (rb_ractor_shareable_p(obj)) {
+            // ok
+        }
+        else {
+            rp(obj);
+            rb_bug("rb_ractor_confirm_belonging object-ractor id:%u, current-ractor id:%u", id, rb_ractor_current_id());
+        }
     }
     return obj;
 }
-- 
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