lll_unlock() will be called again if it goes to "wake_all" in
pthread_cond_broadcast(). This may make another thread which is
waiting for lock in pthread_cond_timedwait() unlock. So there are
more than one threads get the lock, it will break the shared data.
It's introduced by commit
8313cb997d2d("FUTEX_*_REQUEUE_PI support for
non-x86 code")
+2014-04-30 Yang Yingliang <yangyingliang@huawei.com>
+
+ * nptl/pthread_cond_broadcast.c (__pthread_cond_broadcast):
+ Return immediately after lll_futex_wake.
+
2014-04-30 Siddhesh Poyarekar <siddhesh@redhat.com>
[BZ #16791]
wake_all:
lll_futex_wake (&cond->__data.__futex, INT_MAX, pshared);
+ return 0;
}
/* We are done. */