Much like#9366 the same file can be used. This reference leaks according to Nuitka comparative testing:simpleFunction59: FAILED 129511 129512 leaked 1def simpleFunction59():    a = 3    b = 5    try:        a = a * 2        return a    finally:        return a / bI would be guessing, that you are leaking the return value when returning again.

New changeset4d29983185bc12ca685a1eb3873bacb8a7b67416 by Victor Stinner in branch 'master':bpo-36725: regrtest: add TestResult type (GH-12960)https://github.com/python/cpython/commit/4d29983185bc12ca685a1eb3873bacb8a7b67416

New changeset3cde440f20a9db75fb2c4e65e8e4d04a53216a2d by Victor Stinner in branch 'master':bpo-36725: Refactor regrtest multiprocessing code (GH-12961)https://github.com/python/cpython/commit/3cde440f20a9db75fb2c4e65e8e4d04a53216a2d

Sorry, the two commits are related tobpo-36719 not to this issue.

I wrote an unit test to be able to re-use regrtest memory leak hunter:import unittestdef simpleFunction59():    a = 1    try:        return a    finally:        return aclass Tests(unittest.TestCase):    def test_bug(self):        for _ in range(10):            simpleFunction59()I confirm that there is a leak:$ ./python -m test -R 3:3 test_bug...test_bug leaked [10, 10, 10] references, sum=30...

New changeset1069d38fa18f3a4f97c2e358bcb3b82cab1c051b by Victor Stinner in branch '3.7':[3.7]bpo-36719: sync regrtest with master branch (GH-12967)https://github.com/python/cpython/commit/1069d38fa18f3a4f97c2e358bcb3b82cab1c051b

Let me work on this.

@ victor, I have tried your example but I can not reproduce the leak as you did above. May be am missing something?I used some other tool and got this summary when I was investigating this:                            types |   # objects |   total size================================= | =========== | ============                      <class 'str |        3916 |    361.40 KB                     <class 'list |        2513 |    237.41 KB                     <class 'dict |         197 |    120.28 KB                     <class 'code |         617 |     86.79 KB                     <class 'type |          81 |     80.71 KB                      <class 'int |         497 |     13.60 KB                    <class 'tuple |         199 |     12.80 KB              function (__init__) |          61 |      8.10 KB                  <class 'weakref |          87 |      6.80 KB        <class 'getset_descriptor |          67 |      4.71 KB  <class 'collections.OrderedDict |           3 |      4.22 KB            <class 'enum.EnumMeta |           3 |      2.98 KB              function (__call__) |          14 |      1.86 KB                     <class 'cell |          37 |      1.73 KB                   <enum 'Signals |          32 |      1.62 KBAm still investigating though.

I am able to reproduce it finally.Run tests sequentially0:00:00 load avg: 0.21 [1/1] test_bugbeginning 6 repetitions123456......test_bug leaked [10, 10, 10] references, sum=30test_bug failed== Tests result: FAILURE ==1 test failed:    test_bugTotal duration: 220 msTests result: FAILURE

This leak has been fixed by:commitf00828a742d2e88c910bdfd00f08fcd998554ba5 (refs/bisect/bad)Author: Pablo Galindo <Pablogsal@gmail.com>Date:   Thu May 9 16:52:02 2019 +0100bpo-36851: Clean the frame stack if the execution ends with a return and the stack is not empty (GH-13191)