* gc.c (gc_mark_roots): should mark the VM object itself to mark

  singleton class of the VM object.
  Before this patch, we only set mark bit for the VM object and
  invoke mark function separately.
  [Bug #12583]

* test/ruby/test_gc.rb: add a test.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55663 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 0 deletions

diff --git a/test/ruby/test_gc.rb b/test/ruby/test_gc.rb
index d915ae25d7..a5fd2897a2 100644
--- a/test/ruby/test_gc.rb
+++ b/test/ruby/test_gc.rb
@@ -390,4 +390,11 @@ class TestGc < Test::Unit::TestCase
       GC.enable unless disabled
     end
   end
+
+  def test_vm_object
+    assert_normal_exit <<-'end', '[Bug #12583]'
+      ObjectSpace.each_object{|o| o.singleton_class rescue 0}
+      ObjectSpace.each_object{|o| case o when Module then o.instance_methods end}
+    end
+  end
 end