* vm.c: check if cfp is valid. [Bug #5083] [ruby-dev:44208]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32768 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 12 insertions, 0 deletions

diff --git a/test/ruby/test_thread.rb b/test/ruby/test_thread.rb
index daccadde78..c16aa87896 100644
--- a/test/ruby/test_thread.rb
+++ b/test/ruby/test_thread.rb
@@ -604,6 +604,18 @@ class TestThread < Test::Unit::TestCase
       end
     INPUT
   end
+
+  def test_no_valid_cfp
+    bug5083 = '[ruby-dev:44208]'
+    error = assert_raise(RuntimeError) do
+      Thread.new(&Module.method(:nesting)).join
+    end
+    assert_equal("Can't call on top of Fiber or Thread", error.message, bug5083)
+    error = assert_raise(RuntimeError) do
+      Thread.new(:to_s, &Module.method(:undef_method)).join
+    end
+    assert_equal("Can't call on top of Fiber or Thread", error.message, bug5083)
+  end
 end
 
 class TestThreadGroup < Test::Unit::TestCase