diff --git a/ap/libc/glibc/glibc-2.23/malloc/tst-malloc-backtrace.c b/ap/libc/glibc/glibc-2.23/malloc/tst-malloc-backtrace.c
new file mode 100644
index 0000000..3aee7fd
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/malloc/tst-malloc-backtrace.c
@@ -0,0 +1,55 @@
+/* Verify that backtrace does not deadlock on itself on memory corruption.
+   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/>.  */
+
+
+#include <stdlib.h>
+
+#define SIZE 4096
+
+/* Wrap free with a function to prevent gcc from optimizing it out.  */
+static void
+__attribute__((noinline))
+call_free (void *ptr)
+{
+  free (ptr);
+  *(size_t *)(ptr - sizeof (size_t)) = 1;
+}
+
+int do_test (void);
+
+#define TEST_FUNCTION do_test ()
+#define EXPECTED_SIGNAL SIGABRT
+
+#include "../test-skeleton.c"
+
+int
+do_test (void)
+{
+  void *ptr1 = malloc (SIZE);
+  void *ptr2 = malloc (SIZE);
+
+  /* Avoid unwanted output to TTY after an expected memory corruption.  */
+  ignore_stderr();
+
+  call_free (ptr1);
+  ptr1 = malloc (SIZE);
+
+  /* Not reached.  The return statement is to put ptr2 into use so that gcc
+     doesn't optimize out that malloc call.  */
+  return (ptr1 == ptr2);
+}