ko1	2017-06-15 16:16:17 +0900 (Thu, 15 Jun 2017)

  New Revision: 59089

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=59089

  Log:
    Prohibit SystemStackError while GC.
    
    * vm_insnhelper.c (rb_threadptr_stack_overflow): fatal on GC [Bug #13662]

  Modified files:
    trunk/vm_insnhelper.c
Index: vm_insnhelper.c
===================================================================
--- vm_insnhelper.c	(revision 59088)
+++ vm_insnhelper.c	(revision 59089)
@@ -56,8 +56,11 @@ NORETURN(void rb_threadptr_stack_overflo https://github.com/ruby/ruby/blob/trunk/vm_insnhelper.c#L56
 void
 rb_threadptr_stack_overflow(rb_thread_t *th)
 {
+    if (rb_during_gc()) {
+	rb_fatal("machine stack overflow while GC is running.");
+    }
 #ifdef USE_SIGALTSTACK
-    threadptr_stack_overflow(th, !rb_threadptr_during_gc(th));
+    threadptr_stack_overflow(th, TRUE);
 #else
     threadptr_stack_overflow(th, FALSE);
 #endif

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