linux-kernel - Re: WARNING: at mm/mremap.c:211 move_page

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Message-ID: <CAHk-=wgRcFSnQt=T95S+1dPkyvCuVAVGQ37JDvRg41h8hRqO3Q@mail.gmail.com>
Date:   Thu, 9 Jul 2020 12:12:19 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     linux- stable <stable@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>, Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <guro@...com>, Michal Hocko <mhocko@...nel.org>,
        lkft-triage@...ts.linaro.org, Chris Down <chris@...isdown.name>,
        Michel Lespinasse <walken@...gle.com>,
        Fan Yang <Fan_Yang@...u.edu.cn>,
        Brian Geffon <bgeffon@...gle.com>, anshuman.khandual@....com,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>, pugaowei@...il.com,
        Jerome Glisse <jglisse@...hat.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Hugh Dickins <hughd@...gle.com>,
        Al Viro <viro@...iv.linux.org.uk>, Tejun Heo <tj@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: WARNING: at mm/mremap.c:211 move_page_tables in i386

On Wed, Jul 8, 2020 at 10:28 PM Naresh Kamboju
<naresh.kamboju@...aro.org> wrote:
>
> While running LTP mm test suite on i386 or qemu_i386 this kernel warning
> has been noticed from stable 5.4 to stable 5.7 branches and mainline 5.8.0-rc4
> and linux next.

Hmm

If this is repeatable, would you mind making the warning also print
out the old range and new addresses and pmd value?

Something like the attached (UNTESTED!) patch.

         Linus

Download attachment "patch" of type "application/octet-stream" (651 bytes)