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-rw-r--r--nptl/pthread_mutex_lock.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/nptl/pthread_mutex_lock.c b/nptl/pthread_mutex_lock.c
index 1c3ee4fe25..a17013bb76 100644
--- a/nptl/pthread_mutex_lock.c
+++ b/nptl/pthread_mutex_lock.c
@@ -408,7 +408,9 @@ __pthread_mutex_lock (mutex)
 		  break;
 
 		if (oldval != ceilval)
-		  lll_futex_wait (&mutex->__data.__lock, ceilval | 2);
+		  lll_futex_wait (&mutex->__data.__lock, ceilval | 2,
+				  // XYZ check mutex flag
+				  LLL_SHARED);
 	      }
 	    while (atomic_compare_and_exchange_val_acq (&mutex->__data.__lock,
 							ceilval | 2, ceilval)