The attached code produces a memory leak when compiled with -heap-arrays with ifort Version 18.104.22.168.
module m implicit none contains subroutine show(text) character(len=*), intent(in) :: text(:) integer :: i write(*,*) (trim(text(i)),i=1,size(text)) end subroutine show end module m program p use m implicit none character(len=100) :: msg(10) integer :: i msg = "ABC" call show(msg) !do i=1,10000000 ! call show(msg) !enddo end program p
When run with valgrind (commenting the loop) the erros are
$ ifort -g -heap-arrays ml.f90 -o ml $ valgrind --tool=memcheck --leak-check=full ./ml ==6290== Memcheck, a memory error detector ==6290== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al. ==6290== Using Valgrind-3.10.1 and LibVEX; rerun with -h for copyright info ==6290== Command: ./ml ==6290== ABCABCABCABCABCABCABCABCABCABC ==6290== ==6290== HEAP SUMMARY: ==6290== in use at exit: 932 bytes in 10 blocks ==6290== total heap usage: 18 allocs, 8 frees, 13,753 bytes allocated ==6290== ==6290== 900 bytes in 9 blocks are definitely lost in loss record 2 of 2 ==6290== at 0x4C29F60: malloc (vg_replace_malloc.c:296) ==6290== by 0x407A4B: for_allocate (in ml) ==6290== by 0x402534: m_mp_show_ (ml.f90:10) ==6290== by 0x402773: MAIN__ (ml.f90:25) ==6290== by 0x4023AD: main (in ml) ==6290== ==6290== LEAK SUMMARY: ==6290== definitely lost: 900 bytes in 9 blocks ==6290== indirectly lost: 0 bytes in 0 blocks ==6290== possibly lost: 0 bytes in 0 blocks ==6290== still reachable: 32 bytes in 1 blocks ==6290== suppressed: 0 bytes in 0 blocks ==6290== Reachable blocks (those to which a pointer was found) are not shown. ==6290== To see them, rerun with: --leak-check=full --show-leak-kinds=all ==6290== ==6290== For counts of detected and suppressed errors, rerun with: -v ==6290== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
I confirmed the memory leak and escalated this to our Developers. Thank you for the convenient test case. I will keep you updated on the progress of a resolution.
(Internal tracking id: DPD200411297)