Tpetra: Error handling for packCrsMatrix race condition fix

packages/tpetra/core/src/Tpetra_Details_packCrsMatrix_def.hpp

@@ -209,10 +209,12 @@ class NumPacketsAndOffsetsFunctor {
 
   //! Host function for getting the error.
   int getError () const {
-    typedef typename device_type::execution_space execution_space;
     auto error_h = Kokkos::create_mirror_view (error_);
     // DEEP_COPY REVIEW - DEVICE-TO-HOSTMIRROR
-    Kokkos::deep_copy (execution_space(), error_h, error_);
+    // Note: In the UVM case, this would otherwise be a no-op
+    // and thus not fence, so the value might not be correct on return
+    // In the non-UVM case, create_mirror_view will block for the allocation
+    Kokkos::deep_copy (error_h, error_);
     return error_h ();
   }