Hi all, So i have a program that makes it through 1 iteration then crashes in the second at an call MPI_FILE_SET_VIEW. The GDB output give: Program received signal EXC_BAD_ACCESS, Could not access memory. Reason: 13 at address: 0x0000000000000000 0x0000000100ac4b19 in MPIR_Type_get_envelope_impl () (gdb) backtrace #0 0x0000000100ac4b19 in MPIR_Type_get_envelope_impl () #1 0x0000000100ac4d6a in PMPI_Type_get_envelope () the subroutine snippet is: integer :: fileview_hexa integer :: iunit,ierr,size,ibuffer,i,j,k,count_wedge_,count_hexa_ character(len=80) :: buffer character(len=str_short) :: name character(len=str_medium) :: file real(WP),dimension(imino_:imaxo_,jmino_:jmaxo_,kmino_:kmaxo_) :: scalar integer, dimension(MPI_STATUS_SIZE) :: status integer(kind=MPI_OFFSET_KIND) :: disp logical :: file_is_there call MPI_FILE_SET_VIEW(iunit,disp,MPI_REAL_SP,fileview_hexa,"native",mpi_info,ierr) it's from a piece of code that worked fine until i changed some things in the output now i get this segfault. Ryan University of Vermont