ko1	2017-10-28 14:36:48 +0900 (Sat, 28 Oct 2017)

  New Revision: 60499

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=60499

  Log:
    skip machine stack marking for current ec.
    
    * vm.c (rb_execution_context_mark): At the beggining of GC marking,
      mark_current_machine_context() marks running machine stack so that
      rb_execution_context_mark() should not mark machine stack if it is
      current ec.

  Modified files:
    trunk/vm.c
Index: vm.c
===================================================================
--- vm.c	(revision 60498)
+++ vm.c	(revision 60499)
@@ -2398,7 +2398,9 @@ rb_execution_context_mark(const rb_execu https://github.com/ruby/ruby/blob/trunk/vm.c#L2398
     }
 
     /* mark machine stack */
-    if (ec->machine.stack_start && ec->machine.stack_end) {
+    if (ec->machine.stack_start && ec->machine.stack_end &&
+	ec != GET_EC() /* marked for current ec at the first stage of marking */
+	) {
 	rb_gc_mark_machine_stack(ec);
 	rb_gc_mark_locations((VALUE *)&ec->machine.regs,
 			     (VALUE *)(&ec->machine.regs) +

--
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