--- /dev/null
+//---------------------------- vectors_rhs_hp_02.cc ---------------------------
+// $Id: vectors_rhs_hp_02.cc 23710 2011-05-17 04:50:10Z bangerth $
+// Version: $Name$
+//
+// Copyright (C) 2000, 2001, 2003, 2004, 2006, 2007, 2011 by the deal.II authors
+//
+// This file is subject to QPL and may not be distributed
+// without copyright and license information. Please refer
+// to the file deal.II/doc/license.html for the text and
+// further information on this license.
+//
+//---------------------------- vectors_rhs_hp_02.cc ---------------------------
+
+// we get this crash:
+//
+// An error occurred in line <4677> of file </scratch/deal-trunk/deal.II/include/deal.II/numerics/vectors.templates.h> in function
+// void dealii::VectorTools::compute_no_normal_flux_constraints(const DH<dim, spacedim>&, unsigned int, const std::set<unsigned char>&, dealii::ConstraintMatrix&, const dealii::Mapping<dim, spacedim>&) [with int dim = 2, DH = dealii::DoFHandler, int spacedim = 2]
+// The violated condition was:
+// std::fabs(determinant (t)) > 1e-3
+// The name and call sequence of the exception was:
+// ExcMessage("Found a set of normal vectors that are nearly collinear.")
+// Additional Information:
+// Found a set of normal vectors that are nearly collinear.
+
+// the crash does not happen without a boundary object. Same error occures with HyperShellBoundary instead of HalfHyperShellBoundary.
+
+#include "../tests.h"
+
+#include <grid/tria.h>
+#include <grid/grid_generator.h>
+#include <grid/tria_boundary_lib.h>
+#include <dofs/dof_handler.h>
+#include <fe/fe_system.h>
+#include <fe/mapping_q1.h>
+#include <numerics/vectors.h>
+
+using namespace dealii;
+
+template <int dim>
+void run()
+{
+ Triangulation<dim> triangulation;
+ FESystem<dim> fe(FE_Q<dim>(1), dim);
+ DoFHandler<dim> dof_handler (triangulation);
+ ConstraintMatrix constraints;
+ MappingQ<dim> mapping(1);
+
+ GridGenerator::half_hyper_shell (triangulation,
+ Point<dim>(),
+ 0.5,
+ 1);
+
+ static HalfHyperShellBoundary<dim> boundary;
+ triangulation.set_boundary (0, boundary);
+
+ dof_handler.distribute_dofs (fe);
+
+ std::set<unsigned char> no_normal_flux_boundaries;
+ no_normal_flux_boundaries.insert (0);
+ VectorTools::compute_no_normal_flux_constraints
+ (dof_handler, 0,
+ no_normal_flux_boundaries,
+ constraints, mapping);
+}
+
+int main (int argc, char *argv[])
+{
+ std::ofstream logfile ("no_flux_10/output");
+ logfile.precision (4);
+ logfile.setf(std::ios::fixed);
+ deallog.attach(logfile);
+ deallog.depth_console (0);
+
+ run<2> ();
+}