linux-ext4 - Re: mm: mkfs.ext4 invoked oom-killer on i386

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Date:   Thu, 21 May 2020 11:35:49 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     Chris Down <chris@...isdown.name>,
        Yafang Shao <laoar.shao@...il.com>,
        Michal Hocko <mhocko@...nel.org>,
        Anders Roxell <anders.roxell@...aro.org>,
        "Linux F2FS DEV, Mailing List" 
        <linux-f2fs-devel@...ts.sourceforge.net>,
        linux-ext4 <linux-ext4@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        open list <linux-kernel@...r.kernel.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        "Theodore Ts'o" <tytso@....edu>, Chao Yu <chao@...nel.org>,
        Hugh Dickins <hughd@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Chao Yu <yuchao0@...wei.com>, lkft-triage@...ts.linaro.org,
        Johannes Weiner <hannes@...xchg.org>,
        Roman Gushchin <guro@...com>, Cgroups <cgroups@...r.kernel.org>
Subject: Re: mm: mkfs.ext4 invoked oom-killer on i386 - pagecache_get_page

On Thu, May 21, 2020 at 11:22 AM Naresh Kamboju
<naresh.kamboju@...aro.org> wrote:
> On Thu, 21 May 2020 at 00:39, Chris Down <chris@...isdown.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