[Bug fortran/88137] New: BACKTRACE seems to have a memory leak

[longb at cray dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88137

            Bug ID: 88137
           Summary: BACKTRACE seems to have a memory leak
           Product: gcc
           Version: 8.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: longb at cray dot com
  Target Milestone: ---

Simple test case from site:

> cat test.f90
program test

implicit none
integer :: i

do i= 1,10000
call backtrace()
enddo

end program test

Tracing memory usage with gfortran 4.9.3:

Process Memory Details
Virtual maximum (MB) 1.262
Resident maximum (MB) 0.930
Virtual at exit (MB) 1.258
Resident at exit (MB) 0.930

But with gfortran 8.2.0 

Process Memory Details
 Virtual  maximum   (MB)       48282.594
 Resident maximum   (MB)       31592.816
 Virtual  at exit   (MB)       48282.594
 Resident at exit   (MB)       31592.816


While the test case is artificial, it does illustrate that calls to backtrace
seems to accumulate memory usage.