Merge pull request #8275 from wzamazon/v4.1.x_pmix_callback_wmb

[v4.1.x] ompi : add memory barrier in PMIx registration callback

ompi/errhandler/errhandler.c

@@ -229,6 +229,7 @@ void ompi_errhandler_registration_callback(int status,
 
     default_errhandler_id = errhandler_ref;
     errtrk->status = status;
+    opal_atomic_wmb();
     errtrk->active = false;
 }
 

ompi/interlib/interlib.c

@@ -52,6 +52,7 @@ static void model_registration_callback(int status,
 
     trk->status = status;
     interlibhandler_id = errhandler_ref;
+    opal_atomic_wmb();
     trk->active = false;
 }
 static void model_callback(int status,