--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/pr85388-2.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,56 @@
+/* { dg-do run { target { i?86-*-linux* i?86-*-gnu* x86_64-*-linux* } } } */
+/* { dg-require-effective-target cet } */
+/* { dg-require-effective-target split_stack } */
+/* { dg-require-effective-target pthread_h } */
+/* { dg-options "-pthread -fsplit-stack -fcf-protection" } */
+
+#include <stdlib.h>
+#include <pthread.h>
+
+/* Use a noinline function to ensure that the buffer is not removed
+   from the stack.  */
+static void use_buffer (char *buf) __attribute__ ((noinline));
+static void
+use_buffer (char *buf)
+{
+  buf[0] = '\0';
+}
+
+/* Each recursive call uses 10,000 bytes.  We call it 1000 times,
+   using a total of 10,000,000 bytes.  If -fsplit-stack is not
+   working, that will overflow our stack limit.  */
+
+static void
+down (int i)
+{
+  char buf[10000];
+
+  if (i > 0)
+    {
+      use_buffer (buf);
+      down (i - 1);
+    }
+}
+
+static void *
+thread_routine (void *arg __attribute__ ((unused)))
+{
+  down (1000);
+  return NULL;
+}
+
+int
+main (void)
+{
+  int i;
+  pthread_t tid;
+  void *dummy;
+
+  i = pthread_create (&tid, NULL, thread_routine, NULL);
+  if (i != 0)
+    abort ();
+  i = pthread_join (tid, &dummy);
+  if (i != 0)
+    abort ();
+  return 0;
+}