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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
TLS.  This triggers dl-tls assertion failures more reliably than the
nptl/tst-stack4 test.

The dlopened module has 100 DT_NEEDED dependencies with TLS, they were
reused from an existing TLS test. The number of created threads during
dlopen depends on filesystem speed and hardware, but at most 3 threads
are alive at a time to limit resource usage.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Szabolcs Nagy 2016-12-13 12:28:41 +00:00
parent f4f8f4d4e0
commit 9d0e30329c
3 changed files with 76 additions and 2 deletions
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9
elf/Makefile
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@ -224,7 +224,7 @@ tests += restest1 preloadtest loadfail multiload origtest resolvfail \
tst-single_threaded tst-single_threaded-pthread \
tst-tls-ie tst-tls-ie-dlmopen argv0test \
tst-glibc-hwcaps tst-glibc-hwcaps-prepend tst-glibc-hwcaps-mask \
tst-tls20 tst-dlmopen-dlerror
tst-tls20 tst-tls21 tst-dlmopen-dlerror
# reldep9
tests-internal += loadtest unload unload2 circleload1 \
neededtest neededtest2 neededtest3 neededtest4 \
@ -346,7 +346,7 @@ modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \
libmarkermod2-1 libmarkermod2-2 \
libmarkermod3-1 libmarkermod3-2 libmarkermod3-3 \
libmarkermod4-1 libmarkermod4-2 libmarkermod4-3 libmarkermod4-4 \
tst-tls20mod-bad tst-dlmopen-dlerror-mod \
tst-tls20mod-bad tst-tls21mod tst-dlmopen-dlerror-mod \
# Most modules build with _ISOMAC defined, but those filtered out
# depend on internal headers.
@ -1939,3 +1939,8 @@ tst-tls20mod-bad.so-no-z-defs = yes
$(objpfx)tst-tls20: $(libdl) $(shared-thread-library)
$(objpfx)tst-tls20.out: $(objpfx)tst-tls20mod-bad.so \
$(tst-tls-many-dynamic-modules:%=$(objpfx)%.so)
# Reuses tst-tls-many-dynamic-modules
$(objpfx)tst-tls21: $(libdl) $(shared-thread-library)
$(objpfx)tst-tls21.out: $(objpfx)tst-tls21mod.so
$(objpfx)tst-tls21mod.so: $(tst-tls-many-dynamic-modules:%=$(objpfx)%.so)

68
elf/tst-tls21.c Normal file
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@ -0,0 +1,68 @@
/* Test concurrent dlopen and pthread_create: BZ 19329.
Copyright (C) 2021 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 <dlfcn.h>
#include <pthread.h>
#include <stdio.h>
#include <stdatomic.h>
#include <support/xdlfcn.h>
#include <support/xthread.h>
#define THREADS 10000
static atomic_int done;
static void *
start (void *a)
{
/* Load a module with many dependencies that each have TLS. */
xdlopen ("tst-tls21mod.so", RTLD_LAZY);
atomic_store_explicit (&done, 1, memory_order_release);
return 0;
}
static void *
nop (void *a)
{
return 0;
}
static int
do_test (void)
{
pthread_t t1, t2;
int i;
/* Load a module with lots of dependencies and TLS. */
t1 = xpthread_create (0, start, 0);
/* Concurrently create lots of threads until dlopen is observably done. */
for (i = 0; i < THREADS; i++)
{
if (atomic_load_explicit (&done, memory_order_acquire) != 0)
break;
t2 = xpthread_create (0, nop, 0);
xpthread_join (t2);
}
xpthread_join (t1);
printf ("threads created during dlopen: %d\n", i);
return 0;
}
#include <support/test-driver.c>

1
elf/tst-tls21mod.c Normal file
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@ -0,0 +1 @@
int __thread x;