linux-kernel - Re: Possible regression in "slab, slub: skip unnecessary kasan_cache

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Message-ID: <CALvZod7MfTTwbfG3zC1kGrZB1Cf0UAnbvdbqhC5Dm=uy6=DtOg@mail.gmail.com>
Date:   Tue, 19 Jun 2018 08:08:27 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Jason@...c4.com
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kasan-dev@...glegroups.com, Linux MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: Possible regression in "slab, slub: skip unnecessary kasan_cache_shutdown()"

On Tue, Jun 19, 2018 at 6:05 AM Jason A. Donenfeld <Jason@...c4.com> wrote:
>
> HI Dimitry,
>
> On Tue, Jun 19, 2018 at 6:55 AM Dmitry Vyukov <dvyukov@...gle.com> wrote:
> > Your code frees all entries before freeing the cache, right? If you
> > add total_entries check before freeing the cache, it does not fire,
> > right?
>
> Yes, certainly.
>
> > Are you using SLAB or SLUB? We stress kernel pretty heavily, but with
> > SLAB, and I suspect Shakeel may also be using SLAB. So if you are
> > using SLUB, there is significant chance that it's a bug in the SLUB
> > part of the change.
>
> Nice intuition; I am indeed using SLUB rather than SLAB...
>

Can you try once with SLAB? Just to make sure that it is SLUB specific.