--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/torture/pr86505.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,32 @@
+/* { dg-do run } */
+
+static inline __attribute__(( __always_inline__)) int 
+funA(unsigned int param, ...) 
+{ 
+  return __builtin_va_arg_pack_len(); 
+}
+
+static inline __attribute__(( __always_inline__)) int
+funB(unsigned int param, ...)
+{ 
+  return funA(param,  2, 4, __builtin_va_arg_pack()); 
+}
+
+int 
+testBuiltin(void) 
+{ 
+  int rc = funB(0,1,2); 
+  if (rc != 4)
+    return 1;
+  return 0;
+}
+
+int
+main()
+{
+  int rc = testBuiltin();
+  if (rc == 1)
+    __builtin_abort ();
+
+  return 0;
+}