[Bug fortran/88068] New: asan: heap-use-after-free in simplify_ref_chain

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88068

            Bug ID: 88068
           Summary: asan: heap-use-after-free in simplify_ref_chain
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

For fortran test case

./gfortran.dg/inquiry_type_ref_1.f08

I get 

=================================================================
==18514==ERROR: AddressSanitizer: heap-use-after-free on address 0x6170000061d8
at pc 0x00000137e251 bp 0x7ffc3b3f7500 sp 0x7ffc3b3f74f8
READ of size 8 at 0x6170000061d8 thread T0
    #0 0x137e250 in simplify_ref_chain ../../trunk/gcc/fortran/expr.c:1943