From: Matthew Wilcox <willy@infradead.org>
To: Yang Shi <shy828301@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Song Liu <songliubraving@fb.com>,
dennis.lissov@gmail.com, bugzilla-daemon@bugzilla.kernel.org,
Linux MM <linux-mm@kvack.org>
Subject: Re: [Bug 206569] BUG at mm/filemap.c:2529: VM_BUG_ON_PAGE(page_to_pgoff(page) != offset)
Date: Wed, 19 Feb 2020 17:21:52 -0800 [thread overview]
Message-ID: <20200220012152.GU24185@bombadil.infradead.org> (raw)
In-Reply-To: <CAHbLzkpn6Fb7LSL6=DiawwtnoAW1kyZj9r+=kFv0_Vr111zv0A@mail.gmail.com>
On Wed, Feb 19, 2020 at 04:37:11PM -0800, Yang Shi wrote:
> On Wed, Feb 19, 2020 at 4:25 PM Matthew Wilcox <willy@infradead.org> wrote:
> >
> > On Wed, Feb 19, 2020 at 02:46:35PM -0800, Andrew Morton wrote:
> > >
> > > (switched to email. Please respond via emailed reply-to-all, not via the
> > > bugzilla web interface).
> > >
> > > On Wed, 19 Feb 2020 21:33:32 +0000 bugzilla-daemon@bugzilla.kernel.org wrote:
> > >
> > > > https://bugzilla.kernel.org/show_bug.cgi?id=206569
> > > >
> > > > --- Comment #1 from Denis Lisov (dennis.lissov@gmail.com) ---
> > > > Upd. Double-checking my kernel settings I found that I've accidentally enabled
> > > > experimental CONFIG_READ_ONLY_THP_FOR_FS - may be related to that.
> > > >
> > > > In my new kernel build the problem failed to reproduce (I've disabled
> > > > CONFIG_READ_ONLY_THP_FOR_FS, CONFIG_KSM and switched from
> > > > CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS to CONFIG_TRANSPARENT_HUGEPAGE_MADVISE -
> > > > sorry for multiple changes).
> > >
> > > Thanks.
> > >
> > > Song Liu, could you please take a look?
> >
> > This is a compound page ... Dennis, are you willing to apply this patch
> > https://lore.kernel.org/linux-mm/20200211001536.1027652-12-jhubbard@nvidia.com/
> > and retest? It will give us more information about what's going on.
>
> page:ffffc9b318af02c0 refcount:0 mapcount:3 mapping:dead000000000400
> index:0x60b compound_mapcount: 3
>
> It looks like a tail page.
... yes, that's the point; that patch prints the information from the head
page when the page is a tail page.
next prev parent reply other threads:[~2020-02-20 1:21 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-206569-27@https.bugzilla.kernel.org/>
[not found] ` <bug-206569-27-Tvdf5Wtr8t@https.bugzilla.kernel.org/>
2020-02-19 22:46 ` [Bug 206569] BUG at mm/filemap.c:2529: VM_BUG_ON_PAGE(page_to_pgoff(page) != offset) Andrew Morton
2020-02-20 0:25 ` Matthew Wilcox
2020-02-20 0:37 ` Yang Shi
2020-02-20 1:21 ` Matthew Wilcox [this message]
2020-02-20 23:56 ` Denis Lisov
2020-02-21 1:26 ` Song Liu
2020-02-21 8:57 ` Denis Lisov
2020-02-26 22:44 ` Song Liu
2020-05-01 18:05 ` Matthew Wilcox
2020-05-19 0:52 ` Song Liu
2020-10-11 20:21 ` Hugh Dickins
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