Denis Can you post the error message and back trace you get? Best Wolfgang
-------- Original message -------- From: Denis Davydov <[email protected]> Date:09/06/2016 02:44 (GMT-07:00) To: "deal.II developers" <[email protected]> Subject: [dealii-developers] MPI_InitFinalize / active_cell_iterator / double free or corruption Dear all, I just came across a very interesting problem with (active) cell iterator being used as a member of a class in a library template <int dim> class Atom { public: Atom(); typename dealii::DoFHandler<dim>::active_cell_iterator parent_cell; }; This leads to double free or corruption on GCC in Release mode only. The code runs on Clang both in Debug and Release modes. The prerequisites are as follows (if any of those is not the case, problem disappears!) 1. use Utilities::MPI::MPI_InitFinalize in .cc file 2. In the user library, have a default constructor for a class, which contains DoFHandler<dim>::active_cell_iterator 3. link .cc against the library, do not declare and define the class directly inside .cc Attached is a one-dummy-class library with a dummy test which demonstrates the issue. Using GCC it should be enough to do the normal sequence of : cmake / make / make test to see the problem. Given that DoFHandler<dim>::active_cell_iterator has a default constructor, I think one should not see a problem with encapsulating this class inside a user class. It could still be my mistake somewhere, but I squeezed the code so much, that I simply fail to see what could be wrong here. Especially given the prerequisites above. If the attached code turns out to be fine, then we would have to (i) find out the origin of the problem inside deal.II (ii) find out how to add a unit test which builds a library and an executable Regards, Denis. -- You received this message because you are subscribed to the Google Groups "deal.II developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "deal.II developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
