Disable inband PML error reporting during MPI Finalize as it interferes with the Finalize process.

Signed-off-by: Aurelien Bouteiller <bouteill@icl.utk.edu>

ompi/mca/pml/ob1/pml_ob1.c

@@ -3,7 +3,7 @@
  * Copyright (c) 2004-2010 The Trustees of Indiana University and Indiana
  *                         University Research and Technology
  *                         Corporation.  All rights reserved.
- * Copyright (c) 2004-2018 The University of Tennessee and The University
+ * Copyright (c) 2004-2020 The University of Tennessee and The University
  *                         of Tennessee Research Foundation.  All rights
  *                         reserved.
  * Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
@@ -817,6 +817,14 @@ void mca_pml_ob1_error_handler(
         return;
     }
 #endif /* OPAL_CUDA_SUPPORT */
+    /* Some BTL report unreachable errors during normal MPI_Finalize
+     * termination. Lets simply ignore such errors after MPI is not supposed to
+     * be operational anyway.
+     */
+    if(ompi_mpi_state >= OMPI_MPI_STATE_FINALIZE_PAST_COMM_SELF_DESTRUCT) {
+        return;
+    }
+
     ompi_rte_abort(-1, btlinfo);
 }