OneAPI 2024.2.0: ifx with -heap-arrays deallocation bug with temporary lists

[Maranda]

I have discovered a bug with the OneAPI 2024.2.0 compiler, which occurs only on the ifx compiler and only when compiled with -heap-arrays flag.

If you have a type that contains an allocatable array, like so:

type Test
   integer(4), allocatable :: List(:)
endtype

and then pass a temporary list of those types into a subroutine:

call DoSomething([Test1, Test2])

you end up with a segfault upon exiting that subroutine.

Running it through gdb specifically points towards `do_deallocate_all` from the OneAPI 2024.2.0 compiler as the culprit.

The bug doesn't happen if you use ifort included with OneAPI 2024.2.0. It also doesn't happen if you use ifx but take out the heap-array flag.

It's just broken if you use ifx with the heap-array flag.

Attached is a dummy Fortran code I made while I was debugging the issue.

[Maranda]

Forgot to mention: I was on a Linux machine.

[JFH · Accepted solution]

I'm also on a Linux machine. The program was OK with ifx 2025.1.

[Maranda]

Thanks! Using the newer compiler does seem to solve that particular issue