linux-kernel - Re: [PATCH v13 7/7] kasan: don't run tests in async mode

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Message-ID: <CAAeHK+zg5aoFfi1Q36NyoaJqorES+1cvn+mRRcZ64uW8s7kAmQ@mail.gmail.com>
Date:   Fri, 12 Feb 2021 22:44:51 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>
Cc:     Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Will Deacon <will@...nel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [PATCH v13 7/7] kasan: don't run tests in async mode

On Fri, Feb 12, 2021 at 6:22 PM Catalin Marinas <catalin.marinas@....com> wrote:
>
> On Thu, Feb 11, 2021 at 03:33:53PM +0000, Vincenzo Frascino wrote:
> > From: Andrey Konovalov <andreyknvl@...gle.com>
> >
> > Asynchronous KASAN mode doesn't guarantee that a tag fault will be
> > detected immediately and causes tests to fail. Forbid running them
> > in asynchronous mode.
> >
> > Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
> > Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
> > ---
> >  lib/test_kasan.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> >
> > diff --git a/lib/test_kasan.c b/lib/test_kasan.c
> > index f8c72d3aed64..77a60592d350 100644
> > --- a/lib/test_kasan.c
> > +++ b/lib/test_kasan.c
> > @@ -51,6 +51,10 @@ static int kasan_test_init(struct kunit *test)
> >               kunit_err(test, "can't run KASAN tests with KASAN disabled");
> >               return -1;
> >       }
> > +     if (kasan_flag_async) {
> > +             kunit_err(test, "can't run KASAN tests in async mode");
> > +             return -1;
> > +     }
>
> I think we have time to fix this properly ;), so I'd rather not add this
> patch at all.

Yeah, this patch can be dropped.

I have a prototype of async support for tests working. I'll apply it
on top of the next version Vincenzo posts and share the patch.

Vincenzo, when you post the next version, please make sure you rebase
on top of the mm tree version that includes "kasan: export HW_TAGS
symbols for KUnit tests" (linux-next/akpm doesn't yet have it).