--- old/src/os/linux/vm/os_linux.cpp	2015-08-11 01:30:18.512597422 -0400
+++ new/src/os/linux/vm/os_linux.cpp	2015-08-11 01:30:17.004510980 -0400
@@ -5785,9 +5785,11 @@
         status = pthread_mutex_unlock(_mutex);
         assert(status == 0, "invariant");
       } else {
+        // must capture correct index before unlocking
+        int index = _cur_index;
         status = pthread_mutex_unlock(_mutex);
         assert(status == 0, "invariant");
-        status = pthread_cond_signal(&_cond[_cur_index]);
+        status = pthread_cond_signal(&_cond[index]);
         assert(status == 0, "invariant");
       }
     } else {