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commit 9d0e30329c23b5ad736fda3f174208c25970dbce
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Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
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Date: Tue Dec 13 12:28:41 2016 +0000
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elf: Add test case for [BZ #19329]
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Test concurrent dlopen and pthread_create when the loaded modules have
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TLS. This triggers dl-tls assertion failures more reliably than the
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nptl/tst-stack4 test.
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The dlopened module has 100 DT_NEEDED dependencies with TLS, they were
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reused from an existing TLS test. The number of created threads during
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dlopen depends on filesystem speed and hardware, but at most 3 threads
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are alive at a time to limit resource usage.
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Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Conflicts:
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elf/Makefile
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(usual testing differences)
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diff --git a/elf/Makefile b/elf/Makefile
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index 0995d810b57d0dda..be40e3761cf91c4a 100644
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--- a/elf/Makefile
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+++ b/elf/Makefile
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@@ -210,7 +210,7 @@ tests += restest1 preloadtest loadfail multiload origtest resolvfail \
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tst-tls-ie tst-tls-ie-dlmopen \
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argv0test \
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tst-glibc-hwcaps tst-glibc-hwcaps-prepend tst-glibc-hwcaps-mask \
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- tst-tls20
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+ tst-tls20 tst-tls21
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# reldep9
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tests-internal += loadtest unload unload2 circleload1 \
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neededtest neededtest2 neededtest3 neededtest4 \
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@@ -333,7 +333,7 @@ modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \
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libmarkermod2-1 libmarkermod2-2 \
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libmarkermod3-1 libmarkermod3-2 libmarkermod3-3 \
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libmarkermod4-1 libmarkermod4-2 libmarkermod4-3 libmarkermod4-4 \
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- tst-tls20mod-bad
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+ tst-tls20mod-bad tst-tls21mod \
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# Most modules build with _ISOMAC defined, but those filtered out
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# depend on internal headers.
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@@ -1836,3 +1836,8 @@ tst-tls20mod-bad.so-no-z-defs = yes
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$(objpfx)tst-tls20: $(libdl) $(shared-thread-library)
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$(objpfx)tst-tls20.out: $(objpfx)tst-tls20mod-bad.so \
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$(tst-tls-many-dynamic-modules:%=$(objpfx)%.so)
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+
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+# Reuses tst-tls-many-dynamic-modules
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+$(objpfx)tst-tls21: $(libdl) $(shared-thread-library)
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+$(objpfx)tst-tls21.out: $(objpfx)tst-tls21mod.so
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+$(objpfx)tst-tls21mod.so: $(tst-tls-many-dynamic-modules:%=$(objpfx)%.so)
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diff --git a/elf/tst-tls21.c b/elf/tst-tls21.c
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new file mode 100644
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index 0000000000000000..560bf5813a746417
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--- /dev/null
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+++ b/elf/tst-tls21.c
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@@ -0,0 +1,68 @@
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+/* Test concurrent dlopen and pthread_create: BZ 19329.
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+ Copyright (C) 2021 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <http://www.gnu.org/licenses/>. */
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+
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+#include <dlfcn.h>
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+#include <pthread.h>
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+#include <stdio.h>
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+#include <stdatomic.h>
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+#include <support/xdlfcn.h>
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+#include <support/xthread.h>
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+
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+#define THREADS 10000
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+
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+static atomic_int done;
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+
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+static void *
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+start (void *a)
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+{
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+ /* Load a module with many dependencies that each have TLS. */
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+ xdlopen ("tst-tls21mod.so", RTLD_LAZY);
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+ atomic_store_explicit (&done, 1, memory_order_release);
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+ return 0;
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+}
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+
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+static void *
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+nop (void *a)
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+{
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+ return 0;
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+}
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+
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+static int
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+do_test (void)
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+{
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+ pthread_t t1, t2;
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+ int i;
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+
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+ /* Load a module with lots of dependencies and TLS. */
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+ t1 = xpthread_create (0, start, 0);
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+
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+ /* Concurrently create lots of threads until dlopen is observably done. */
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+ for (i = 0; i < THREADS; i++)
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+ {
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+ if (atomic_load_explicit (&done, memory_order_acquire) != 0)
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+ break;
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+ t2 = xpthread_create (0, nop, 0);
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+ xpthread_join (t2);
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+ }
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+
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+ xpthread_join (t1);
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+ printf ("threads created during dlopen: %d\n", i);
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+ return 0;
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+}
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+
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+#include <support/test-driver.c>
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diff --git a/elf/tst-tls21mod.c b/elf/tst-tls21mod.c
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new file mode 100644
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index 0000000000000000..206ece4fb34622a9
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--- /dev/null
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+++ b/elf/tst-tls21mod.c
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@@ -0,0 +1 @@
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+int __thread x;
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