htl: Enable more tests

* nptl/tst-_res1.c, tst-_res1mod1.c, tst-_res1mod2.c, tst-atfork2.c,
tst-atfork2mod.c, tst-fini1.c, tst-fini1mod.c, tst-tls4.c, tst-tls4moda.c,
tst-tls4modb.c: Move to...
* sysdeps/pthread: ... here.  Rename tst-tls4.c to tst-pt-tls4.c to avoid
conflicting with elf/tst-tls4.c.
* nptl/Makefile: Move corresponding references and rules to...
* sysdeps/pthread/Makefile: ... here.

11 files changed, 739 insertions, 0 deletions

diff --git a/sysdeps/pthread/Makefile b/sysdeps/pthread/Makefile
index 5f9610ecbf..2d483c8534 100644
--- a/sysdeps/pthread/Makefile
+++ b/sysdeps/pthread/Makefile
@@ -117,6 +117,22 @@ tests += tst-cancelx2 tst-cancelx3 tst-cancelx8 tst-cancelx10 \
 	 tst-cancelx12 tst-cancelx14 tst-cancelx15 tst-cancelx18 \
 	 tst-cleanupx0 tst-cleanupx1 tst-cleanupx2 tst-cleanupx3
 
+ifeq ($(build-shared),yes)
+tests += tst-atfork2 tst-pt-tls4 tst-_res1 tst-fini1
+tests-nolibpthread += tst-fini1
+endif
+
+modules-names += tst-atfork2mod tst-tls4moda tst-tls4modb \
+		 tst-_res1mod1 tst-_res1mod2 tst-fini1mod
+test-modules = $(addprefix $(objpfx),$(addsuffix .so,$(modules-names)))
+
+tst-atfork2mod.so-no-z-defs = yes
+
+ifeq ($(build-shared),yes)
+# Build all the modules even when not actually running test programs.
+tests: $(test-modules)
+endif
+
 tests-static += tst-locale1 tst-locale2
 
 tests += tst-cond11-static
@@ -150,6 +166,15 @@ CFLAGS-tst-pt-align3.c += $(stack-align-test-flags)
 
 tst-umask1-ARGS = $(objpfx)tst-umask1.temp
 
+$(objpfx)tst-atfork2: $(libdl) $(shared-thread-library)
+LDFLAGS-tst-atfork2 = -rdynamic
+tst-atfork2-ENV = MALLOC_TRACE=$(objpfx)tst-atfork2.mtrace
+$(objpfx)tst-atfork2mod.so: $(shared-thread-library)
+
+ifeq ($(build-shared),yes)
+$(objpfx)tst-atfork2.out: $(objpfx)tst-atfork2mod.so
+endif
+
 ifeq ($(build-shared),yes)
 $(objpfx)tst-cleanup0.out: /dev/null $(objpfx)tst-cleanup0
 	$(make-test-out) > $@ 2>&1; \
@@ -164,7 +189,23 @@ else
 $(objpfx)tst-cancel28: $(common-objpfx)rt/librt.a
 endif
 
+$(objpfx)tst-fini1: $(shared-thread-library) $(objpfx)tst-fini1mod.so
+
+$(objpfx)tst-fini1mod.so: $(shared-thread-library)
+
+$(objpfx)tst-_res1mod2.so: $(objpfx)tst-_res1mod1.so
+LDFLAGS-tst-_res1mod1.so = -Wl,-soname,tst-_res1mod1.so
+LDFLAGS-tst-_res1mod2.so = -Wl,-soname,tst-_res1mod2.so
+$(objpfx)tst-_res1: $(objpfx)tst-_res1mod1.so $(objpfx)tst-_res1mod2.so \
+		    $(shared-thread-library)
+
+$(objpfx)tst-pt-tls4: $(libdl) $(shared-thread-library)
+$(objpfx)tst-pt-tls4.out: $(objpfx)tst-tls4moda.so $(objpfx)tst-tls4modb.so
+
+generated += tst-atfork2.mtrace
 
+generated += $(objpfx)tst-atfork2.mtrace \
+	     $(addsuffix .so,$(strip $(modules-names)))
 
 tests-internal += tst-robust8
 
diff --git a/sysdeps/pthread/tst-_res1.c b/sysdeps/pthread/tst-_res1.c
new file mode 100644
index 0000000000..3e186bcb39
--- /dev/null
+++ b/sysdeps/pthread/tst-_res1.c
@@ -0,0 +1,68 @@
+/* Copyright (C) 2003-2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
+
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+/* Test whether _res in glibc 2.1.x and earlier (before __res_state()
+   was introduced) works.  Portable programs should never do the
+   dirty things below.  */
+
+#include <pthread.h>
+#include <resolv.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+void *tf (void *resp)
+{
+  if (resp == &_res || resp == __res_state ())
+    abort ();
+  _res.retry = 24;
+  return NULL;
+}
+
+void do_test (struct __res_state *resp)
+{
+  if (resp != &_res || resp != __res_state ())
+    abort ();
+  if (_res.retry != 12)
+    abort ();
+}
+
+int main (void)
+{
+#undef _res
+  extern struct __res_state _res;
+  pthread_t th;
+
+  _res.retry = 12;
+  if (pthread_create (&th, NULL, tf, &_res) != 0)
+    {
+      puts ("create failed");
+      exit (1);
+    }
+
+  do_test (&_res);
+
+  if (pthread_join (th, NULL) != 0)
+    {
+      puts ("join failed");
+      exit (1);
+    }
+
+  do_test (&_res);
+
+  exit (0);
+}
diff --git a/sysdeps/pthread/tst-_res1mod1.c b/sysdeps/pthread/tst-_res1mod1.c
new file mode 100644
index 0000000000..3af31c4c03
--- /dev/null
+++ b/sysdeps/pthread/tst-_res1mod1.c
@@ -0,0 +1,22 @@
+/* Copyright (C) 2003-2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
+
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <resolv.h>
+#undef _res
+
+struct __res_state _res;
diff --git a/sysdeps/pthread/tst-_res1mod2.c b/sysdeps/pthread/tst-_res1mod2.c
new file mode 100644
index 0000000000..d2a3509c6d
--- /dev/null
+++ b/sysdeps/pthread/tst-_res1mod2.c
@@ -0,0 +1 @@
+/* Nothing.  */
diff --git a/sysdeps/pthread/tst-atfork2.c b/sysdeps/pthread/tst-atfork2.c
new file mode 100644
index 0000000000..6e4b803413
--- /dev/null
+++ b/sysdeps/pthread/tst-atfork2.c
@@ -0,0 +1,158 @@
+/* Copyright (C) 2003-2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
+
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <dlfcn.h>
+#include <errno.h>
+#include <mcheck.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/wait.h>
+
+
+/* Must be exported.  */
+int val;
+
+static void
+prepare (void)
+{
+  val *= 2;
+}
+
+static void
+parent (void)
+{
+  val += 4;
+}
+
+static void
+child (void)
+{
+  val += 8;
+}
+
+
+static int
+do_test (void)
+{
+  mtrace ();
+
+  if (pthread_atfork (prepare, parent, child) != 0)
+    {
+      puts ("do_test: atfork failed");
+      exit (1);
+    }
+
+  void *h = dlopen ("tst-atfork2mod.so", RTLD_LAZY);
+  if (h == NULL)
+    {
+      printf ("dlopen failed: %s\n", dlerror ());
+      exit (1);
+    }
+
+  /* First trial of fork.  */
+  pid_t pid = fork ();
+  if (pid == -1)
+    {
+      puts ("1st fork failed");
+      exit (1);
+    }
+
+  if (pid == 0)
+    {
+      /* Child.  */
+      if (val != 80)
+	{
+	  printf ("1st: expected val=%d, got %d\n", 80, val);
+	  exit (2);
+	}
+
+      exit (0);
+    }
+
+  /* Parent.  */
+  if (val != 24)
+    {
+      printf ("1st: expected val=%d, got %d\n", 24, val);
+      exit (1);
+    }
+
+  int status;
+  if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
+    {
+      puts ("1st waitpid failed");
+      exit (1);
+    }
+
+  if (status != 0)
+    exit (status);
+
+  puts ("unloading now");
+
+  /* Unload the module.  */
+  if (dlclose (h) != 0)
+    {
+      puts ("dlclose failed");
+      exit (1);
+    }
+
+  puts ("2nd fork");
+
+  /* Second fork trial.   */
+  val = 1;
+  pid = fork ();
+  if (pid == -1)
+    {
+      puts ("2nd fork failed");
+      exit (1);
+    }
+
+  if (pid == 0)
+    {
+      /* Child.  */
+      if (val != 10)
+	{
+	  printf ("2nd: expected val=%d, got %d\n", 10, val);
+	  exit (3);
+	}
+
+      exit (0);
+    }
+
+  /* Parent.  */
+  if (val != 6)
+    {
+      printf ("2nd: expected val=%d, got %d\n", 6, val);
+      exit (1);
+    }
+
+  if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
+    {
+      puts ("2nd waitpid failed");
+      exit (1);
+    }
+
+  if (status != 0)
+    exit (status);
+
+  return 0;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"
diff --git a/sysdeps/pthread/tst-atfork2mod.c b/sysdeps/pthread/tst-atfork2mod.c
new file mode 100644
index 0000000000..b307a307ec
--- /dev/null
+++ b/sysdeps/pthread/tst-atfork2mod.c
@@ -0,0 +1,57 @@
+/* Copyright (C) 2003-2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
+
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <dso_handle.h>
+
+
+extern int val;
+
+
+static void
+prepare (void)
+{
+  ++val;
+}
+
+static void
+parent (void)
+{
+  val *= 4;
+}
+
+static void
+child (void)
+{
+  val *= 8;
+}
+
+static void
+__attribute__ ((constructor))
+init (void)
+{
+  printf ("dsohandle = %p\n", __dso_handle);
+
+  if (pthread_atfork (prepare, parent, child) != 0)
+    {
+      puts ("init: atfork failed");
+      exit (1);
+    }
+}
diff --git a/sysdeps/pthread/tst-fini1.c b/sysdeps/pthread/tst-fini1.c
new file mode 100644
index 0000000000..d395fad970
--- /dev/null
+++ b/sysdeps/pthread/tst-fini1.c
@@ -0,0 +1,34 @@
+/* Copyright (C) 2004-2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 2004.
+
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <unistd.h>
+
+extern void m (void);
+
+int
+main (void)
+{
+  alarm (5);
+
+  m ();
+
+  /* The destructor is supposed to run now.  Make sure that if it is
+     not we will notice it by using 42 as the exit code.  In case the
+     destructor is run it will terminate with status zero.  */
+  return 42;
+}
diff --git a/sysdeps/pthread/tst-fini1mod.c b/sysdeps/pthread/tst-fini1mod.c
new file mode 100644
index 0000000000..6c10303d34
--- /dev/null
+++ b/sysdeps/pthread/tst-fini1mod.c
@@ -0,0 +1,71 @@
+/* Copyright (C) 2004-2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 2004.
+
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+
+static void *
+tf (void *arg)
+{
+  int fds[2];
+  if (pipe (fds) != 0)
+    {
+      puts ("pipe failed");
+      exit (1);
+    }
+
+  char buf[10];
+  read (fds[0], buf, sizeof (buf));
+
+  puts ("read returned");
+  exit (1);
+}
+
+static pthread_t th;
+
+static void
+__attribute ((destructor))
+dest (void)
+{
+  if (pthread_cancel (th) != 0)
+    {
+      puts ("cancel failed");
+      _exit (1);
+    }
+  void *r;
+  if (pthread_join (th, &r) != 0)
+    {
+      puts ("join failed");
+      _exit (1);
+    }
+  /* Exit successfully.  */
+  _exit (0);
+}
+
+void
+m (void)
+{
+  if (pthread_create (&th, NULL, tf, NULL) != 0)
+    {
+      puts ("create failed");
+      _exit (1);
+    }
+}
diff --git a/sysdeps/pthread/tst-pt-tls4.c b/sysdeps/pthread/tst-pt-tls4.c
new file mode 100644
index 0000000000..7fd65de79d
--- /dev/null
+++ b/sysdeps/pthread/tst-pt-tls4.c
@@ -0,0 +1,180 @@
+/* Copyright (C) 2003-2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
+
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <dlfcn.h>
+#include <errno.h>
+#include <pthread.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#define N 3
+
+void (*test1) (void), (*test2) (void);
+
+pthread_barrier_t b2, b3;
+
+static void *
+tf (void *arg)
+{
+  int i;
+
+  for (i = 0; i <= (uintptr_t) arg; ++i)
+    {
+      int r = pthread_barrier_wait (&b3);
+      if (r != 0 && r != PTHREAD_BARRIER_SERIAL_THREAD)
+	{
+	  puts ("tf: barrier_wait failed");
+	  exit (1);
+	}
+    }
+
+  test1 ();
+
+  for (i = 0; i < 3; ++i)
+    {
+      int r = pthread_barrier_wait (&b3);
+      if (r != 0 && r != PTHREAD_BARRIER_SERIAL_THREAD)
+	{
+	  puts ("tf: barrier_wait failed");
+	  exit (1);
+	}
+    }
+
+  test2 ();
+
+  for (i = 0; i < 3 - (uintptr_t) arg; ++i)
+    {
+      int r = pthread_barrier_wait (&b3);
+      if (r != 0 && r != PTHREAD_BARRIER_SERIAL_THREAD)
+	{
+	  puts ("tf: barrier_wait failed");
+	  exit (1);
+	}
+    }
+
+  return NULL;
+}
+
+static void *
+tf2 (void *arg)
+{
+  int r = pthread_barrier_wait (&b2);
+  if (r != 0 && r != PTHREAD_BARRIER_SERIAL_THREAD)
+    {
+      puts ("tf2: barrier_wait failed");
+      exit (1);
+    }
+
+  int i;
+  for (i = 0; i < N; ++i)
+    tf (arg);
+  return NULL;
+}
+
+int
+do_test (void)
+{
+  pthread_t th[2];
+  const char *modules[N]
+    = { "tst-tls4moda.so", "tst-tls4moda.so", "tst-tls4modb.so" };
+
+  if (pthread_barrier_init (&b2, NULL, 2) != 0)
+    {
+      puts ("barrier_init failed");
+      return 1;
+    }
+
+  if (pthread_barrier_init (&b3, NULL, 3) != 0)
+    {
+      puts ("barrier_init failed");
+      return 1;
+    }
+
+  if (pthread_create (&th[0], NULL, tf2, (void *) (uintptr_t) 1))
+    {
+      puts ("pthread_create failed");
+      return 1;
+    }
+
+  int r = pthread_barrier_wait (&b2);
+  if (r != 0 && r != PTHREAD_BARRIER_SERIAL_THREAD)
+    {
+      puts ("barrier_wait failed");
+      return 1;
+    }
+
+  int i;
+  for (i = 0; i < N; ++i)
+    {
+      void *h = dlopen (modules[i], RTLD_LAZY);
+      if (h == NULL)
+	{
+	  printf ("dlopen failed %s\n", dlerror ());
+	  return 1;
+	}
+
+      test1 = dlsym (h, "test1");
+      if (test1 == NULL)
+	{
+	  printf ("dlsym for test1 failed %s\n", dlerror ());
+	  return 1;
+	}
+
+      test2 = dlsym (h, "test2");
+      if (test2 == NULL)
+	{
+	  printf ("dlsym for test2 failed %s\n", dlerror ());
+	  return 1;
+	}
+
+      if (pthread_create (&th[1], NULL, tf, (void *) (uintptr_t) 2))
+	{
+	  puts ("pthread_create failed");
+	  return 1;
+	}
+
+      tf ((void *) (uintptr_t) 0);
+
+      if (pthread_join (th[1], NULL) != 0)
+	{
+	  puts ("join failed");
+	  return 1;
+	}
+
+      if (dlclose (h))
+	{
+	  puts ("dlclose failed");
+	  return 1;
+	}
+
+      printf ("test %d with %s succeeded\n", i, modules[i]);
+    }
+
+  if (pthread_join (th[0], NULL) != 0)
+    {
+      puts ("join failed");
+      return 1;
+    }
+
+  return 0;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"
diff --git a/sysdeps/pthread/tst-tls4moda.c b/sysdeps/pthread/tst-tls4moda.c
new file mode 100644
index 0000000000..ccff2a797a
--- /dev/null
+++ b/sysdeps/pthread/tst-tls4moda.c
@@ -0,0 +1,49 @@
+/* Copyright (C) 2003-2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
+
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <stddef.h>
+#include <stdlib.h>
+
+static __thread unsigned char foo [32]
+  __attribute__ ((tls_model ("initial-exec"), aligned (sizeof (void *))));
+
+void
+test1 (void)
+{
+  size_t s;
+
+  for (s = 0; s < sizeof (foo); ++s)
+    {
+      if (foo [s])
+	abort ();
+      foo [s] = s;
+    }
+}
+
+void
+test2 (void)
+{
+  size_t s;
+
+  for (s = 0; s < sizeof (foo); ++s)
+    {
+      if (foo [s] != s)
+	abort ();
+      foo [s] = sizeof (foo) - s;
+    }
+}
diff --git a/sysdeps/pthread/tst-tls4modb.c b/sysdeps/pthread/tst-tls4modb.c
new file mode 100644
index 0000000000..2c29c2d18a
--- /dev/null
+++ b/sysdeps/pthread/tst-tls4modb.c
@@ -0,0 +1,58 @@
+/* Copyright (C) 2003-2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
+
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <stddef.h>
+#include <stdlib.h>
+
+static int i;
+int bar;
+
+static __thread void *foo [32 / sizeof (void *)]
+  __attribute__ ((tls_model ("initial-exec"), aligned (sizeof (void *))))
+  = { &i, &bar };
+
+void
+test1 (void)
+{
+  size_t s;
+
+  if (foo [0] != &i || foo [1] != &bar)
+    abort ();
+
+  foo [0] = NULL;
+  foo [1] = NULL;
+  for (s = 0; s < sizeof (foo) / sizeof (void *); ++s)
+    {
+      if (foo [s])
+	abort ();
+      foo [s] = &foo[s];
+    }
+}
+
+void
+test2 (void)
+{
+  size_t s;
+
+  for (s = 0; s < sizeof (foo) / sizeof (void *); ++s)
+    {
+      if (foo [s] != &foo [s])
+	abort ();
+      foo [s] = &foo [s ^ 1];
+    }
+}