From: Marc Fehling <mafehling.git@gmail.com>
Date: Sat, 23 Oct 2021 02:40:13 +0000 (-0600)
Subject: Bugfix: Clear DataTransfer after all data has been unpacked.
X-Git-Tag: v9.4.0-rc1~889^2~1
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=64eec36f3fc50575564249a5df3aaa2448872ccb;p=dealii.git

Bugfix: Clear DataTransfer after all data has been unpacked.
---

diff --git a/source/distributed/tria_base.cc b/source/distributed/tria_base.cc
index 32ed494e94..7f6eecfc72 100644
--- a/source/distributed/tria_base.cc
+++ b/source/distributed/tria_base.cc
@@ -809,17 +809,15 @@ namespace parallel
     // would destroy the saved data before the second SolutionTransfer can
     // get it. This created a bug that is documented in
     // tests/mpi/p4est_save_03 with more than one SolutionTransfer.
+
     if (cell_attached_data.n_attached_data_sets == 0 &&
         cell_attached_data.n_attached_deserialize == 0)
       {
         // everybody got their data, time for cleanup!
         cell_attached_data.pack_callbacks_fixed.clear();
         cell_attached_data.pack_callbacks_variable.clear();
-      }
+        data_transfer.clear();
 
-    if (this->cell_attached_data.n_attached_data_sets == 0 &&
-        this->cell_attached_data.n_attached_deserialize == 0)
-      {
         // reset all cell_status entries after coarsening/refinement
         for (auto &cell_rel : local_cell_relations)
           cell_rel.second =