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

[Guido van Rossum]

[Adding Raymond to the thread, since he doesn't always follow the lists
closely.]

On Tue, Oct 20, 2015 at 8:23 PM, Benjamin Peterson <benjamin at python.org>
wrote:

>
>
> On Tue, Oct 20, 2015, at 15:57, Antoine Pitrou wrote:
> >
> > > 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.
>
> The problem is that the "subscript" class is not a GC type, but
> participates in a cycle through its type. I suspect it's type to force
> all heap types to have GC. Armin Rigo found previous examples where this
> special case caused problems, and I don't see what it buys anyway.
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-- 
--Guido van Rossum (python.org/~guido)
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