/* Verify that backtrace does not deadlock on itself on memory corruption.

   Copyright (C) 2015-2018 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 <signal.h>

#include <stdlib.h>

#include <support/support.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)

{

  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);

}

#define EXPECTED_SIGNAL SIGABRT

#include <support/test-driver.c>