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From:   =?UTF-8?Q?=C5=81ukasz_Majczak?= <lma@semihalf.com>
Date:   Wed, 27 Jan 2021 11:08:17 +0100
Message-ID: <CAFJ_xboaFNQ9NuZ1rhH8WdejoFRzvez9cp2AQ59rKY6T_xZ-_w@mail.gmail.com>
Subject: Re: PROBLEM: Crash after mm: fix initialization of struct page for
 holes in memory layout
To:     Mike Rapoport <rppt@linux.ibm.com>
Cc:     Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org,
        =?UTF-8?Q?Rados=C5=82aw_Biernacki?= <rad@semihalf.com>,
        Marcin Wojtas <mw@semihalf.com>,
        Alex Levin <levinale@google.com>,
        Guenter Roeck <groeck@google.com>,
        Jesse Barnes <jsbarnes@google.com>,
        Chris Wilson <chris@chris-wilson.co.uk>,
        "Sarvela, Tomi P" <tomi.p.sarvela@intel.com>
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Hi Mike,

Actually I have a serial console attached (via servo device), but
there is no output :( and also the reboot/crash is very fast/immediate
after power on.

Best regards
Lukasz

=C5=9Br., 27 sty 2021 o 11:05 Mike Rapoport <rppt@linux.ibm.com> napisa=C5=
=82(a):
>
> Hi Lukasz,
>
> On Wed, Jan 27, 2021 at 10:22:29AM +0100, =C5=81ukasz Majczak wrote:
> > Crash after mm: fix initialization of struct page for holes in memory l=
ayout
> >
> > Hi,
> > I was trying to run v5.11-rc5 on my Samsung Chromebook Pro (Caroline),
> > but I've noticed it has crashed - unfortunately it seems to happen at
> > a very early stage - No output to the console nor to the screen, so I
> > have started a bisect (between 5.11-rc4 - which works just find - and
> > 5.11-rc5),
> > bisect results points to:
> >
> > d3921cb8be29 mm: fix initialization of struct page for holes in memory =
layout
> >
> > Reproduction is just to build and load the kernel.
> >
> > If it will help any how I am attaching:
> > - /proc/cpuinfo (from healthy system):
> > https://gist.github.com/semihalf-majczak-lukasz/3517867bf39f07377c1a785=
b64a97066
> > - my .config file (for a broken system):
> > https://gist.github.com/semihalf-majczak-lukasz/584b329f1bf3e43b53efe8e=
18b5da33c
> >
> > If there is anything I could add/do/test to help fix this please let me=
 know.
>
> Chris Wilson also reported boot failures on several Chromebooks:
>
> https://lore.kernel.org/lkml/161160687463.28991.354987542182281928@build.=
alporthouse.com
>
> I presume serial console is not an option, so if you could boot with
> earlyprintk=3Dvga and see if there is anything useful printed on the scre=
en
> it would be really helpful.
>
> > Best regards
> > Lukasz
>
> --
> Sincerely yours,
> Mike.