7155cb953d
Upstream commit: 06865865151579d1aa17d38110060a68b85c5d90 - pthread/tst-cancel28: Fix barrier re-init race condition - Use $(pie-default) with conformtest - Run conform/ tests using newly built libc - nptl: Add one more barrier to nptl/tst-create1
64 lines
2.2 KiB
Diff
64 lines
2.2 KiB
Diff
commit e9f81c261a2ca74d31d07ff9c8e780ac8a25993c
|
|
Author: Florian Weimer <fweimer@redhat.com>
|
|
Date: Fri Dec 10 05:14:24 2021 +0100
|
|
|
|
nptl: Add one more barrier to nptl/tst-create1
|
|
|
|
Without the bar_ctor_finish barrier, it was possible that thread2
|
|
re-locked user_lock before ctor had a chance to lock it. ctor then
|
|
blocked in its locking operation, xdlopen from the main thread
|
|
did not return, and thread2 was stuck waiting in bar_dtor:
|
|
|
|
thread 1: started.
|
|
thread 2: started.
|
|
thread 2: locked user_lock.
|
|
constructor started: 0.
|
|
thread 1: in ctor: started.
|
|
thread 3: started.
|
|
thread 3: done.
|
|
thread 2: unlocked user_lock.
|
|
thread 2: locked user_lock.
|
|
|
|
Fixes the test in commit 83b5323261bb72313bffcf37476c1b8f0847c736
|
|
("elf: Avoid deadlock between pthread_create and ctors [BZ #28357]").
|
|
|
|
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
|
|
(cherry picked from commit 5cc338565479a620244c2f8ff35956629c4dbf81)
|
|
|
|
diff --git a/sysdeps/pthread/tst-create1.c b/sysdeps/pthread/tst-create1.c
|
|
index 932586c30990d1d4..763ded8d7956f943 100644
|
|
--- a/sysdeps/pthread/tst-create1.c
|
|
+++ b/sysdeps/pthread/tst-create1.c
|
|
@@ -33,6 +33,7 @@ thread 2: lock(user_lock) -> pthread_create
|
|
*/
|
|
|
|
static pthread_barrier_t bar_ctor;
|
|
+static pthread_barrier_t bar_ctor_finish;
|
|
static pthread_barrier_t bar_dtor;
|
|
static pthread_mutex_t user_lock = PTHREAD_MUTEX_INITIALIZER;
|
|
|
|
@@ -46,6 +47,7 @@ ctor (void)
|
|
xpthread_mutex_unlock (&user_lock);
|
|
dprintf (1, "thread 1: in ctor: unlocked user_lock.\n");
|
|
dprintf (1, "thread 1: in ctor: done.\n");
|
|
+ xpthread_barrier_wait (&bar_ctor_finish);
|
|
}
|
|
|
|
void
|
|
@@ -81,6 +83,7 @@ thread2 (void *a)
|
|
xpthread_mutex_unlock (&user_lock);
|
|
dprintf (1, "thread 2: unlocked user_lock.\n");
|
|
xpthread_join (t3);
|
|
+ xpthread_barrier_wait (&bar_ctor_finish);
|
|
|
|
xpthread_mutex_lock (&user_lock);
|
|
dprintf (1, "thread 2: locked user_lock.\n");
|
|
@@ -99,6 +102,7 @@ thread1 (void)
|
|
{
|
|
dprintf (1, "thread 1: started.\n");
|
|
xpthread_barrier_init (&bar_ctor, NULL, 2);
|
|
+ xpthread_barrier_init (&bar_ctor_finish, NULL, 2);
|
|
xpthread_barrier_init (&bar_dtor, NULL, 2);
|
|
pthread_t t2 = xpthread_create (0, thread2, 0);
|
|
void *p = xdlopen ("tst-create1mod.so", RTLD_NOW | RTLD_GLOBAL);
|