escape all env properly.

* vm_backtrace.c (rb_debug_inspector_open): escape all env using
  `rb_vm_stack_to_heap()` before making bindings.
  [Bug #15105]

  There is a complicated story of this issue:
  Without this patch, IFUNC frame does not escaped. A IFUNC frame
  points to CFUNC ep as previous ep. However, CFUNC ep can be escaped
  because of making bindings of Ruby level frames.
  IFUNC's ep can points to invalidated ep and `rb_iter_break()` will
  fail. This is why `any?` fails.

* test/-ext-/debug/test_debug.rb: add a test.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64800 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/-ext-/debug/test_debug.rb

@@ -56,4 +56,20 @@ class TestDebug < Test::Unit::TestCase
     binds = inspector_in_eval
     binds_check binds, bug7635
   end
+
+  class MyRelation 
+    include Enumerable 
+ 
+    def each
+      yield :each_entry
+    end 
+   end 
+ 
+  def test_lazy_block
+    x = MyRelation.new.any? do
+      Bug::Debug.inspector
+      true
+    end 
+    assert_equal true, x, '[Bug #15105]'
+  end
 end

vm_backtrace.c

@@ -1202,6 +1202,9 @@ rb_debug_inspector_open(rb_debug_inspector_func_t func, void *data)
     enum ruby_tag_type state;
     volatile VALUE MAYBE_UNUSED(result);
 
+    /* escape all env to heap */
+    rb_vm_stack_to_heap(ec);
+
     dbg_context.ec = ec;
     dbg_context.cfp = dbg_context.ec->cfp;
     dbg_context.backtrace = ec_backtrace_location_ary(ec, 0, 0);