https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95150
Bug ID: 95150 Summary: Some offloaded programs crash with openmp Product: gcc Version: 10.1.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libgomp Assignee: unassigned at gcc dot gnu.org Reporter: chinoune.mehdi at hotmail dot com CC: jakub at gcc dot gnu.org Target Milestone: --- This is the reduced program: $ cat matmul.F90 program main implicit none integer, parameter :: sp = selected_real_kind(6,37) integer, parameter :: l = 1024, m = 1024, n = 1024 real(sp), allocatable :: a(:,:), b(:,:), c(:,:) integer :: i, j, k, t1, t2 real(sp) :: tic ! call system_clock( t1, tic) ! allocate( a(l,m), b(m,n), c(l,n) ) ! call random_number(a) call random_number(b) c = 0._sp ! !$acc data copyin(a,b) copyout(c) !$acc parallel loop collapse(3) !$omp target teams distribute collapse(3) map( to:a,b ) map( tofrom:c) do j = 1, n do k = 1, m do i = 1, l c(i,j) = a(i,k)*b(k,j) + c(i,j) end do end do end do !$acc end data ! call system_clock(t2) print*, (t2-t1)/tic ! end program main This program compiles successfully with both OpenMP and OpenACC but it crashs with OpenMP after a short time of running, throwing this error message: $ gfortran-10 -fopenmp -foffload=nvptx-none="-lm -lgfortran" matmul.F90 -o test.x $ $ ./test.x libgomp: cuCtxSynchronize error: the launch timed out and was terminated The same message appears with gfortran-9