linux-kernel - Re: linusw/for-next boot bisection: v5.2-rc1-8-g73a790c68d7e on rk3288-veyron-jaq

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Date:   Tue, 28 May 2019 09:36:03 +0100
From:   Guillaume Tucker <guillaume.tucker@...labora.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Elaine Zhang <zhangqing@...k-chips.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Linux PM list <linux-pm@...r.kernel.org>,
        Kevin Hilman <khilman@...libre.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        Mark Brown <broonie@...nel.org>,
        Matt Hart <matthew.hart@...aro.org>, mgalka@...labora.com,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Zhang Rui <rui.zhang@...el.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: linusw/for-next boot bisection: v5.2-rc1-8-g73a790c68d7e on
 rk3288-veyron-jaq

Hi Geert,

On 28/05/2019 08:45, Geert Uytterhoeven wrote:
> Hi Guillaume,
> 
> On Tue, May 28, 2019 at 9:13 AM Guillaume Tucker
> <guillaume.tucker@...labora.com> wrote:
>> On 28/05/2019 00:38, kernelci.org bot wrote:
>>> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
>>> * This automated bisection report was sent to you on the basis  *
>>> * that you may be involved with the breaking commit it has      *
>>> * found.  No manual investigation has been done to verify it,   *
>>> * and the root cause of the problem may be somewhere else.      *
>>> * Hope this helps!                                              *
>>> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
>>>
>>> linusw/for-next boot bisection: v5.2-rc1-8-g73a790c68d7e on rk3288-veyron-jaq
>>>
>>> Summary:
>>>   Start:      73a790c68d7e Merge branch 'devel' into for-next
>>>   Details:    https://kernelci.org/boot/id/5cebf03d59b514dd627a3629
>>>   Plain log:  https://storage.kernelci.org//linusw/for-next/v5.2-rc1-8-g73a790c68d7e/arm/multi_v7_defconfig/gcc-8/lab-collabora/boot-rk3288-veyron-jaq.txt
>>>   HTML log:   https://storage.kernelci.org//linusw/for-next/v5.2-rc1-8-g73a790c68d7e/arm/multi_v7_defconfig/gcc-8/lab-collabora/boot-rk3288-veyron-jaq.html
>>>   Result:     28694e009e51 thermal: rockchip: fix up the tsadc pinctrl setting error
>>>
>>> Checks:
>>>   revert:     PASS
>>>   verify:     PASS
>>>
>>> Parameters:
>>>   Tree:       linusw
>>>   URL:        https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git/
>>>   Branch:     for-next
>>>   Target:     rk3288-veyron-jaq
>>>   CPU arch:   arm
>>>   Lab:        lab-collabora
>>>   Compiler:   gcc-8
>>>   Config:     multi_v7_defconfig
>>>   Test suite: boot
>>>
>>> Breaking commit found:
>>>
>>> -------------------------------------------------------------------------------
>>> commit 28694e009e512451ead5519dd801f9869acb1f60
>>> Author: Elaine Zhang <zhangqing@...k-chips.com>
>>> Date:   Tue Apr 30 18:09:44 2019 +0800
>>>
>>>     thermal: rockchip: fix up the tsadc pinctrl setting error
>>
>> This commit has now been reverted in mainline.  Would it be OK
>> for you to rebase your for-next branch on v5.2-rc2 or cherry-pick
>> the revert to avoid recurring bisections?
>>
>> Ideally this should have been fixed or reverted in mainline
>> before v5.2-rc1 was released, or even earlier when this was first
>> found in -next on 13th May.  Unfortunately it was overlooked and
>> then spread to other branches like yours.
> 
> I'm afraid it's gonna spread to even more for-next branches, as most
> subsystem maintainers base their for-next branch on the previous rc1
> release.  Typically maintainers do not rebase their for-next branches,
> and do not cherry-pick fixes, unless they are critical for their
> subsystem.  So you can expect this to show up in e.g. the m68k for-next
> branch soon...

That is what I feared, thanks for confirming.

> Can't you mark this as a known issue, to prevent spending cycles on the
> same bisection, and sending out more bisection reports for the same
> issue?

Not really, so I've disabled bisections in the linux-gpio tree
and a few other maintainers' trees for now.  I'll see if we can
come up with a more systematic way of suppressing bisections in
similar cases (i.e. the issue has been fixed in mainline later
than the base commit for the branch being tested).

Thanks,
Guillaume