[Python-Dev] [Python-checkins] Daily reference leaks (d7e490db8d54): sum=61494

[Antoine Pitrou]

> These leaks have been here a while. Anyone know the cause?
> 
> On Tue, 20 Oct 2015 at 01:47 <solipsis at pitrou.net> wrote:
> 
>> results for d7e490db8d54 on branch "default"
>> --------------------------------------------
>>
>> test_capi leaked [5411, 5411, 5411] references, sum=16233
>> test_capi leaked [1421, 1423, 1423] memory blocks, sum=4267
>> test_functools leaked [0, 2, 2] memory blocks, sum=4
>> test_threading leaked [10820, 10820, 10820] references, sum=32460
>> test_threading leaked [2842, 2844, 2844] memory blocks, sum=8530

Bisection shows they were probably introduced by:

changeset:   97413:dccc4e63aef5
user:        Raymond Hettinger <python at rcn.com>
date:        Sun Aug 16 19:43:34 2015 -0700
files:       Doc/library/operator.rst Doc/whatsnew/3.6.rst
Lib/operator.py Lib/test/test_operator.py
description:
Issue #24379: Add operator.subscript() as a convenience for building slices.


If you comment out `@object.__new__` on line 411 in operator.py, or if
you remove the __slots__ assignment (which is a bit worrying), the leak
seems suppressed.

You can reproduce using:

$ ./python -m test -m SubinterpreterTest -R 3:3 test_capi
[1/1] test_capi
beginning 6 repetitions
123456
......
test_capi leaked [5443, 5443, 5443] references, sum=16329
test_capi leaked [1432, 1434, 1434] memory blocks, sum=4300
1 test failed:
    test_capi


Regards

Antoine.