possible compiler bug: memory leakage with allocatable components

Dear developers,

We've been having difficulty with a memory leaks, and we suspect the problem is in the compiler. The appended code (test_leak.f90) is similar to ours, and reproduces the problem.

After executing the following commands, we see the memory usage of a.out increase approximately linearly in time.

ifort test_leak.f90
a.out &
top

We don't see what what's wrong with the code.

We noted that the program barely uses any memory when the FINAL procedures are uncommented. But shouldn't they be redundant? In "Modern Fortran Explained", Metcalf et al. say that "when a variable of derived type is deallocated, any ultimate allocatable component that
is currently allocated is also deallocated, as if by a deallocate statement".

Extra info:

• OS: CentOS Linux release 7.3.1611 (Core)
• ifort version: 17.0.4

• The command lscpu prints the following CPU info:
  Architecture:          x86_64
  CPU op-mode(s):        32-bit, 64-bit
  Byte Order:            Little Endian
  CPU(s):                12
  On-line CPU(s) list:   0-11
  Thread(s) per core:    1
  Core(s) per socket:    6
  Socket(s):             2
  NUMA node(s):          2
  Vendor ID:             GenuineIntel
  CPU family:            6
  Model:                 62
  Model name:            Intel(R) Xeon(R) CPU E5-2630 v2 @ 2.60GHz
  Stepping:              4
  CPU MHz:               2899.914
  BogoMIPS:              5205.87
  Virtualization:        VT-x
  L1d cache:             32K
  L1i cache:             32K
  L2 cache:              256K
  L3 cache:              15360K
  NUMA node0 CPU(s):     0-5
  NUMA node1 CPU(s):     6-11