gdb crashes on printing allocatable array in Fortran derived type

Package: gdb (8.1-0ubuntu3.2 Ubuntu:18.04/bionic-updates [amd64])
Ubuntu Release: Ubuntu 18.04.4 LTS

Bug occurs when trying to print allocatable or pointer component of a Fortran derived-type structure in gdb.

Expected behavior:
gdb prints the contents of array BUFFER%ALPHA in the MWE below.

Observed behavior:

See upstream report https://sourceware.org/bugzilla/show_bug.cgi?id=23051

When trying to print BUFFER%ALPHA, gdb crashes. The MWE copied form the above link is:

  1 PROGRAM allocate_array
  2
  3 TYPE L_BUFFER
  4 REAL, DIMENSION(:), POINTER :: ALPHA
  5 END TYPE L_BUFFER
  6 TYPE(L_BUFFER), POINTER :: BUFFER
  7
  8 ALLOCATE(BUFFER)
  9
 10 ALLOCATE(BUFFER%ALPHA(5))
 11
 12 BUFFER%ALPHA(5)=0.0078
 13 print *, buffer%alpha
 14
 15 END PROGRAM allocate_array

And the gdb output reads:

Breakpoint 1, allocate_array () at allocate_array.F90:13
13 print *, buffer%alpha
(gdb) i lo
buffer = 0x603f80
(gdb) p *buffer
$1 = (
value.c:3116: internal-error: value* value_primitive_field(value*, LONGEST, int, type*): Assertion `PROP_CONST == TYPE_DATA_LOCATION_KIND (type)' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) n

The same error can be observed from inside a type-bound procedure when trying to print THIS%ALPHA (where this is the instance variable).

The assertion fails since TYPE_DATA_LOCATION_KIND (type) is PROP_LOCEXPR. A standalone allocatable array has the property type PROP_CONST, as expected.

This bug renders debugging of Fortran code with visual tools (vscode, eclipse, etc.) very difficult as the components are parsed automatically, leading to a crash.