https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83436
Bug ID: 83436 Summary: Internal file cannot be accessed by UNFORMATTED data transfer when reading from /dev/urandom Product: gcc Version: 7.2.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: fortran Assignee: unassigned at gcc dot gnu.org Reporter: daanvanvugt at gmail dot com Target Milestone: --- With the update to 7.2.1 the following code fragment starts failing: Fortran runtime error: Internal file cannot be accessed by UNFORMATTED data transfer !> Read an int from /dev/urandom subroutine read_urandom_int(seed, ierr) implicit none integer, intent(out) :: seed integer, intent(out) :: ierr integer :: un open(newunit=un, file="/dev/urandom", access="stream", & form="unformatted", action="read", status="old", iostat=ierr) if (ierr == 0) then read(un) seed close(un) end if end subroutine read_urandom_int I think this might be a regression. The same code works just fine in intel compiler and older gfortran versions.