ko1	2017-09-11 02:30:16 +0900 (Mon, 11 Sep 2017)

  New Revision: 59829

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=59829

  Log:
    clear `stack_end`.
    
    * cont.c (cont_save_thread): clear only `stack_end`. Clearing tells
      GC mark function to ignore this macine stack (not allocated yet).
      `stack_start` will be used by machine stack store/restore phase
      (on FIBER_USE_NATIVE == 0), so that only `stack_end` is cleared.

  Modified files:
    trunk/cont.c
Index: cont.c
===================================================================
--- cont.c	(revision 59828)
+++ cont.c	(revision 59829)
@@ -485,16 +485,14 @@ cont_save_thread(rb_context_t *cont, rb_ https://github.com/ruby/ruby/blob/trunk/cont.c#L485
     /* save thread context */
     sth->ec = th->ec;
 
-#if FIBER_USE_NATIVE
-    /* saved_thread->machine.stack_(start|end) should be NULL */
+    /* saved_thread->machine.stack_end should be NULL */
     /* because it may happen GC afterward */
-    sth->ec.machine.stack_start = NULL;
     sth->ec.machine.stack_end = NULL;
+
 #ifdef __ia64
     sth->ec.machine.register_stack_start = NULL;
     sth->ec.machine.register_stack_end = NULL;
 #endif
-#endif
 }
 
 static void

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