Don't retain/release the ompi instance for predefined attributes

Predefined attributes are created during creation of the ompi instance.
By not retaining the instance during predefined attribute construction
we break the cycle that prevents the instance from being released properly.

Signed-off-by: Joseph Schuchart <schuchart@icl.utk.edu>

Author: devreal

ompi/attribute/attribute.c

@@ -692,17 +692,22 @@ int ompi_attr_create_keyval(ompi_attribute_type_t type,
 {
     ompi_attribute_fortran_ptr_t es_tmp;
     int rc;
-
-    rc = ompi_mpi_instance_retain ();
-    if (OPAL_UNLIKELY(OMPI_SUCCESS != rc)) {
-        return rc;
+    bool is_predefined = flags & OMPI_KEYVAL_PREDEFINED;
+
+    /* Predefined attributes are created as part of the instance creation,
+     * so do not retain the instance to avoid a circular dependency */
+    if (!is_predefined) {
+        rc = ompi_mpi_instance_retain ();
+        if (OPAL_UNLIKELY(OMPI_SUCCESS != rc)) {
+            return rc;
+        }
     }
 
     es_tmp.c_ptr = extra_state;
     rc = ompi_attr_create_keyval_impl(type, copy_attr_fn, delete_attr_fn,
                                       key, &es_tmp, flags,
                                       bindings_extra_state);
-    if (OPAL_UNLIKELY(OMPI_SUCCESS != rc)) {
+    if (OPAL_UNLIKELY(OMPI_SUCCESS != rc) && !is_predefined) {
         ompi_mpi_instance_release ();
     }
 
@@ -786,8 +791,12 @@ int ompi_attr_free_keyval(ompi_attribute_type_t type, int *key,
     opal_atomic_wmb();
     OPAL_THREAD_UNLOCK(&attribute_lock);
 
-    /* balance out retain in keyval_create */
-    ompi_mpi_instance_release ();
+    /* balance out retain in keyval_create
+     * predefined attributes do not retain the instance so do not release it either
+     */
+    if (!predefined) {
+        ompi_mpi_instance_release ();
+    }
 
     return MPI_SUCCESS;
 }