linux-kernel - Re: next/master bisection: baseline.login on rk3288-rock2-square

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Message-ID: <CAMj1kXEshuPTrKvN4LpXQMftHJG+yH8+fgU7uVc6GYn0qd8-xA@mail.gmail.com>
Date:   Thu, 4 Feb 2021 16:42:15 +0100
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Guillaume Tucker <guillaume.tucker@...labora.com>
Cc:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Nicolas Pitre <nico@...xnic.net>,
        "kernelci-results@...ups.io" <kernelci-results@...ups.io>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: next/master bisection: baseline.login on rk3288-rock2-square

On Thu, 4 Feb 2021 at 12:32, Guillaume Tucker
<guillaume.tucker@...labora.com> wrote:
>
> On 04/02/2021 10:33, Guillaume Tucker wrote:
> > On 04/02/2021 10:27, Ard Biesheuvel wrote:
> >> On Thu, 4 Feb 2021 at 11:06, Russell King - ARM Linux admin
> >> <linux@...linux.org.uk> wrote:
> >>>
> >>> On Thu, Feb 04, 2021 at 10:07:58AM +0100, Ard Biesheuvel wrote:
> >>>> On Thu, 4 Feb 2021 at 09:43, Guillaume Tucker
> >>>> <guillaume.tucker@...labora.com> wrote:
> >>>>>
> >>>>> Hi Ard,
> >>>>>
> >>>>> Please see the bisection report below about a boot failure on
> >>>>> rk3288 with next-20210203.  It was also bisected on
> >>>>> imx6q-var-dt6customboard with next-20210202.
> >>>>>
> >>>>> Reports aren't automatically sent to the public while we're
> >>>>> trialing new bisection features on kernelci.org but this one
> >>>>> looks valid.
> >>>>>
> >>>>> The kernel is most likely crashing very early on, so there's
> >>>>> nothing in the logs.  Please let us know if you need some help
> >>>>> with debugging or trying a fix on these platforms.
> >>>>>
> >>>>
> >>>> Thanks for the report.
> >>>
> >>> Ard,
> >>>
> >>> I want to send my fixes branch today which includes your regression
> >>> fix that caused this regression.
> >>>
> >>> As this is proving difficult to fix, I can only drop your fix from
> >>> my fixes branch - and given that this seems to be problematical, I'm
> >>> tempted to revert the original change at this point which should fix
> >>> both of these regressions - and then we have another go at getting rid
> >>> of the set/way instructions during the next cycle.
> >>>
> >>> Thoughts?
> >>>
> >>
> >> Hi Russell,
> >>
> >> If Guillaume is willing to do the experiment, and it fixes the issue,
> >
> > Yes, I'm running some tests with that fix now and should have
> > some results shortly.
>
> Yes it does fix the issue:
>
>   https://lava.collabora.co.uk/scheduler/job/3173819
>
> with Ard's fix applied to this test branch:
>
>   https://gitlab.collabora.com/gtucker/linux/-/commits/next-20210203-ard-fix/
>
>
> +clang +Nick
>
> It's worth mentioning that the issue only happens with kernels
> built with Clang.  As you can see there are several other arm
> platforms failing with clang-11 builds but booting fine with
> gcc-8:
>
>   https://kernelci.org/test/job/next/branch/master/kernel/next-20210203/plan/baseline/
>
> Here's a sample build log:
>
>   https://storage.staging.kernelci.org/gtucker/next-20210203-ard-fix/v5.10-rc4-24722-g58b6c0e507b7-gtucker_single-staging-33/arm/multi_v7_defconfig/clang-11/build.log
>
> Essentially:
>
>   make -j18 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- LLVM=1 CC="ccache clang" zImage
>
> I believe it should be using the GNU assembler as LLVM_IAS=1 is
> not defined, but there may be something more subtle about it.
>


Do you have a link for a failing zImage built from multi_v7_defconfig?