Hello everyone.
I am solving two equations iteratively in an MPI framework. The first 
equation is the equilibrium equation (slightly modified) solved in step-8 
while the second equation (Damage equation) is very similar to the Laplace 
equation solved in step-3.
The solution of equilibrium equation depends on the damage solution vector 
and vice versa. To begin with, the damage solution vector is created as 
follows:

(locally_relevant_solution_damage.reinit(locally_owned_dofs_damage,
locally_relevant_dofs_damage,
mpi_communicator);) 

Next, for the first iteration, we need to set the damage solution as 1 for 
certain nodes, as shown:
for (const auto &cell : dof_handler_damage.active_cell_iterators())
{
if (cell->is_locally_owned())

{
for (const auto vertex_number : cell->vertex_indices())
{
const auto vert = cell->vertex(vertex_number);
int a =  cell->vertex_dof_index(vertex_number, 0);
if (condition is satisfied by the vertex)
{
locally_relevant_solution_damage[a] = 1;
}
else
{
locally_relevant_solution_damage[a] = 0;
}
}
}
}

However, I am getting a segmentation fault when I try to extract any entry 
of locally_relevant_solution_damage. 

I first thought that I needed to use the compress operation, but then I 
read that compressing does not apply to vectors with ghost elements. Now, I 
am unable to figure out what could be causing this segmentation fault.
Error message:
Primary job  terminated normally, but 1 process returned
a non-zero exit code. Per user-direction, the job has been aborted.
--------------------------------------------------------------------------
--------------------------------------------------------------------------
mpirun noticed that process rank 0 with PID 0 on node wasim-OptiPlex-5080 
exited on signal 11 (Segmentation fault).

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