diff --git a/ap/libc/glibc/glibc-2.23/malloc/tst-malloc-thread-exit.c b/ap/libc/glibc/glibc-2.23/malloc/tst-malloc-thread-exit.c
new file mode 100644
index 0000000..f4aa21a
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/malloc/tst-malloc-thread-exit.c
@@ -0,0 +1,217 @@
+/* Test malloc with concurrent thread termination.
+   Copyright (C) 2015-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* This thread spawns a number of outer threads, equal to the arena
+   limit.  The outer threads run a loop which start and join two
+   different kinds of threads: the first kind allocates (attaching an
+   arena to the thread; malloc_first_thread) and waits, the second
+   kind waits and allocates (wait_first_threads).  Both kinds of
+   threads exit immediately after waiting.  The hope is that this will
+   exhibit races in thread termination and arena management,
+   particularly related to the arena free list.  */
+
+#include <errno.h>
+#include <pthread.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#define TIMEOUT 7
+
+static bool termination_requested;
+static int inner_thread_count = 4;
+static size_t malloc_size = 32;
+
+static void
+__attribute__ ((noinline, noclone))
+unoptimized_free (void *ptr)
+{
+  free (ptr);
+}
+
+static void *
+malloc_first_thread (void * closure)
+{
+  pthread_barrier_t *barrier = closure;
+  void *ptr = malloc (malloc_size);
+  if (ptr == NULL)
+    {
+      printf ("error: malloc: %m\n");
+      abort ();
+    }
+  int ret = pthread_barrier_wait (barrier);
+  if (ret != 0 && ret != PTHREAD_BARRIER_SERIAL_THREAD)
+    {
+      errno = ret;
+      printf ("error: pthread_barrier_wait: %m\n");
+      abort ();
+    }
+  unoptimized_free (ptr);
+  return NULL;
+}
+
+static void *
+wait_first_thread (void * closure)
+{
+  pthread_barrier_t *barrier = closure;
+  int ret = pthread_barrier_wait (barrier);
+  if (ret != 0 && ret != PTHREAD_BARRIER_SERIAL_THREAD)
+    {
+      errno = ret;
+      printf ("error: pthread_barrier_wait: %m\n");
+      abort ();
+    }
+  void *ptr = malloc (malloc_size);
+  if (ptr == NULL)
+    {
+      printf ("error: malloc: %m\n");
+      abort ();
+    }
+  unoptimized_free (ptr);
+  return NULL;
+}
+
+static void *
+outer_thread (void *closure)
+{
+  pthread_t *threads = calloc (sizeof (*threads), inner_thread_count);
+  if (threads == NULL)
+    {
+      printf ("error: calloc: %m\n");
+      abort ();
+    }
+
+  while (!__atomic_load_n (&termination_requested, __ATOMIC_RELAXED))
+    {
+      pthread_barrier_t barrier;
+      int ret = pthread_barrier_init (&barrier, NULL, inner_thread_count + 1);
+      if (ret != 0)
+        {
+          errno = ret;
+          printf ("pthread_barrier_init: %m\n");
+          abort ();
+        }
+      for (int i = 0; i < inner_thread_count; ++i)
+        {
+          void *(*func) (void *);
+          if ((i  % 2) == 0)
+            func = malloc_first_thread;
+          else
+            func = wait_first_thread;
+          ret = pthread_create (threads + i, NULL, func, &barrier);
+          if (ret != 0)
+            {
+              errno = ret;
+              printf ("error: pthread_create: %m\n");
+              abort ();
+            }
+        }
+      ret = pthread_barrier_wait (&barrier);
+      if (ret != 0 && ret != PTHREAD_BARRIER_SERIAL_THREAD)
+        {
+          errno = ret;
+          printf ("pthread_wait: %m\n");
+          abort ();
+        }
+      for (int i = 0; i < inner_thread_count; ++i)
+        {
+          ret = pthread_join (threads[i], NULL);
+          if (ret != 0)
+            {
+              ret = errno;
+              printf ("error: pthread_join: %m\n");
+              abort ();
+            }
+        }
+      ret = pthread_barrier_destroy (&barrier);
+      if (ret != 0)
+        {
+          ret = errno;
+          printf ("pthread_barrier_destroy: %m\n");
+          abort ();
+        }
+    }
+
+  free (threads);
+
+  return NULL;
+}
+
+static int
+do_test (void)
+{
+  /* The number of top-level threads should be equal to the number of
+     arenas.  See arena_get2.  */
+  long outer_thread_count = sysconf (_SC_NPROCESSORS_ONLN);
+  if (outer_thread_count >= 1)
+    {
+      /* See NARENAS_FROM_NCORES in malloc.c.  */
+      if (sizeof (long) == 4)
+        outer_thread_count *= 2;
+      else
+        outer_thread_count *= 8;
+    }
+
+  /* Leave some room for shutting down all threads gracefully.  */
+  int timeout = TIMEOUT - 2;
+
+  pthread_t *threads = calloc (sizeof (*threads), outer_thread_count);
+  if (threads == NULL)
+    {
+      printf ("error: calloc: %m\n");
+      abort ();
+    }
+
+  for (long i = 0; i < outer_thread_count; ++i)
+    {
+      int ret = pthread_create (threads + i, NULL, outer_thread, NULL);
+      if (ret != 0)
+        {
+          errno = ret;
+          printf ("error: pthread_create: %m\n");
+          abort ();
+        }
+    }
+
+  struct timespec ts = {timeout, 0};
+  if (nanosleep (&ts, NULL))
+    {
+      printf ("error: error: nanosleep: %m\n");
+      abort ();
+    }
+
+  __atomic_store_n (&termination_requested, true, __ATOMIC_RELAXED);
+
+  for (long i = 0; i < outer_thread_count; ++i)
+    {
+      int ret = pthread_join (threads[i], NULL);
+      if (ret != 0)
+        {
+          errno = ret;
+          printf ("error: pthread_join: %m\n");
+          abort ();
+        }
+    }
+  free (threads);
+
+  return 0;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"