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From:   Arnd Bergmann <arnd@arndb.de>
Date:   Thu, 21 May 2020 11:35:49 +0200
Message-ID: <CAK8P3a2Yna-BD+M6-+Y2Go_Y0ZXx8_7KMud7JxSfPbG8+-Q7Wg@mail.gmail.com>
Subject: Re: mm: mkfs.ext4 invoked oom-killer on i386 - pagecache_get_page
To:     Naresh Kamboju <naresh.kamboju@linaro.org>
Cc:     Chris Down <chris@chrisdown.name>,
        Yafang Shao <laoar.shao@gmail.com>,
        Michal Hocko <mhocko@kernel.org>,
        Anders Roxell <anders.roxell@linaro.org>,
        "Linux F2FS DEV, Mailing List" 
        <linux-f2fs-devel@lists.sourceforge.net>,
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        Hugh Dickins <hughd@google.com>,
        Andrea Arcangeli <aarcange@redhat.com>,
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On Thu, May 21, 2020 at 11:22 AM Naresh Kamboju
<naresh.kamboju@linaro.org> wrote:
> On Thu, 21 May 2020 at 00:39, Chris Down <chris@chrisdown.name> wrote:
> > Since you have i386 hardware available, and I don't, could you please apply
> > only "avoid stale protection" again and check if it only happens with that
> > commit, or requires both? That would help narrow down the suspects.

Note that Naresh is running an i386 kernel on regular 64-bit hardware that
most people have access to.

> kernel config link,
> https://builds.tuxbuild.com/8lg6WQibcwtQRRtIa0bcFA/kernel.config

Do you know if the same bug shows up running a kernel with that
configuration in qemu? I would expect it to, and that would make
it much easier to reproduce.

I would also not be surprised if it happens on all architectures but only
shows up on the 32-bit arm and x86 machines first because they have
a rather limited amount of lowmem. Maybe booting a 64-bit kernel
with "mem=512M" and then running "dd if=/dev/sda of=/dev/null bs=1M"
will also trigger it. I did not attempt to run this myself.

       Arnd