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From: "federico.perini at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug fortran/107157] New: Weird out-of-bounds error with multiple move_alloc's Date: Wed, 05 Oct 2022 14:14:15 +0000 [thread overview] Message-ID: <bug-107157-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107157 Bug ID: 107157 Summary: Weird out-of-bounds error with multiple move_alloc's Product: gcc Version: 12.1.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: fortran Assignee: unassigned at gcc dot gnu.org Reporter: federico.perini at gmail dot com Target Milestone: --- I'm in trouble reducing this problem to a minimum viable example, so I'm asking for help - I have a nested derived type that contains allocatable components, like: type :: string character(len=1), allocatable :: t(:) end type string type :: data_point type(string) :: name real(real64), allocatable :: data(:) end type data_point type :: data_set type(data_point), allocatable :: data(:) end type data_set Now, I read in type(data_set) from several input files, and I grow that using a move_alloc, this way: subroutine read_dataset(this,fileName) class(data_set), intent(inout) :: this character(*), intent(in) :: fileName type(data_point), allocatable :: tmp(:) type(data_point) :: this_file [...] read_data: do n = n+1 ! Read one call this_file%read(blabla) ! Extend & copy allocate(tmp(n)) if (n>1) tmp(1:n-1) = this%data(1:n-1) tmp(n) = this_file call move_alloc(from=tmp,to=this%data) end do read_data end subroutine Starting from n>=2, after the routine exits, I have this error: ``` Fortran runtime error: Index '1' of dimension 1 of array '_F.DA0' outside of expected range (0:0) ``` - the error points to the end line of the module ("end module blabla") - I have no structures with that '_F.DA0' name, nor I can find anything like that in a text search in the .mod file (after unzipping it) - No error if move_alloc is called at most once I would like to reduce the problem to a simpler case I can post but I haven't been able to reproduce this so I'm asking for help: is there any compiler flags I can turn on to produce more output and/or understand better what's going on? Thank you in advance, Federico
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