https://git.ruby-lang.org/ruby.git/commit/?id=8b41e9b6e7

From 8b41e9b6e77b74ba7b90774dc1ff1959b95ca61a Mon Sep 17 00:00:00 2001
From: Aaron Patterson <tenderlove@r...>
Date: Tue, 22 Sep 2020 08:57:48 -0700
Subject: Revert "Pin values in the finalizer table"

If an object has a finalizer flag set on it, prevent it from moving.

This partially reverts commit 1a9dd31910699c7cd69f2a84c94af20eacd5875c.

diff --git a/gc.c b/gc.c
index aa63cdb..5e84f51 100644
--- a/gc.c
+++ b/gc.c
@@ -7860,6 +7860,11 @@ gc_is_moveable_obj(rb_objspace_t *objspace, VALUE obj) https://github.com/ruby/ruby/blob/trunk/gc.c#L7860
       case T_RATIONAL:
       case T_NODE:
       case T_CLASS:
+        if (FL_TEST(obj, FL_FINALIZE)) {
+            if (st_is_member(finalizer_table, obj)) {
+                return FALSE;
+            }
+        }
         return RVALUE_MARKED(obj) && !RVALUE_PINNED(obj);
 
       default:
@@ -8757,6 +8762,7 @@ gc_update_references(rb_objspace_t * objspace) https://github.com/ruby/ruby/blob/trunk/gc.c#L8762
     gc_update_tbl_refs(objspace, objspace->obj_to_id_tbl);
     gc_update_table_refs(objspace, objspace->id_to_obj_tbl);
     gc_update_table_refs(objspace, global_symbols.str_sym);
+    gc_update_table_refs(objspace, finalizer_table);
 }
 
 static VALUE type_sym(size_t type);
-- 
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