[Bug nptl/23861] rdlock stalls indefinitely on an unlocked pthread rwlock

["prohaska7 at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23861

--- Comment #2 from richard prohaska <prohaska7 at gmail dot com> ---
This patch sets r = __readers in the inner loop as suggested and runs the test
program successfully.

diff --git a/nptl/pthread_rwlock_common.c b/nptl/pthread_rwlock_common.c
index a290d08332..8c970d19c3 100644
--- a/nptl/pthread_rwlock_common.c
+++ b/nptl/pthread_rwlock_common.c
@@ -314,7 +314,7 @@ __pthread_rwlock_rdlock_full (pthread_rwlock_t *rwlock,
                 harmless because the flag is just about the state of
                 __readers, and all threads set the flag under the same
                 conditions.  */
-             while ((atomic_load_relaxed (&rwlock->__data.__readers)
+                while (((r = atomic_load_relaxed (&rwlock->__data.__readers))
                  & PTHREAD_RWLOCK_RWAITING) != 0)
                {
                  int private = __pthread_rwlock_get_private (rwlock);

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