From: Martin Kronbichler <martin.kronbichler@uni-a.de>
Date: Thu, 25 Aug 2022 07:26:02 +0000 (+0200)
Subject: MatrixFree: Fix bug in setup of new cell_index for MG
X-Git-Tag: v9.5.0-rc1~1017^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F14219%2Fhead;p=dealii.git

MatrixFree: Fix bug in setup of new cell_index for MG
---

diff --git a/include/deal.II/matrix_free/matrix_free.templates.h b/include/deal.II/matrix_free/matrix_free.templates.h
index 4eef8291f0..e0272e9f8e 100644
--- a/include/deal.II/matrix_free/matrix_free.templates.h
+++ b/include/deal.II/matrix_free/matrix_free.templates.h
@@ -869,7 +869,9 @@ MatrixFree<dim, Number, VectorizedArrayType>::internal_reinit(
 
     mf_cell_indices.resize((mg_level == numbers::invalid_unsigned_int) ?
                              tria.n_active_cells() :
-                             tria.n_cells(mg_level),
+                             (mg_level < tria.n_levels() ?
+                                tria.n_raw_cells(mg_level) :
+                                0),
                            numbers::invalid_unsigned_int);
 
     for (unsigned int cell = 0;