linux-kernel - Re: WARNING: at mm/page-writeback.c:1990 __set_page_dirty

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Message-ID: <CA+55aFz--XDSOConDoM2SO0Jpd78Dg4GsGP+Z0F+__JWz+6JoQ@mail.gmail.com>
Date:	Sun, 3 Jun 2012 16:13:13 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Dave Jones <davej@...hat.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan@...nel.org>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Cong Wang <amwang@...hat.com>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: WARNING: at mm/page-writeback.c:1990 __set_page_dirty_nobuffers+0x13a/0x170()

On Sun, Jun 3, 2012 at 3:17 PM, Hugh Dickins <hughd@...gle.com> wrote:
>
> But another strike against that commit: I tried fixing it up to use
> start_page instead of page at the end, with the worrying but safer
> locking I suggested at first, with a count of how many times it went
> there, and how many times it succeeded.

You can't use start_page anyway, it might not be a valid page. There's
a reson it does that "pfn_valid_within()", methinks.

Anyway, my current plan is to apply your "mm: fix warning in
__set_page_dirty_nobuffers" patch - even if it's just a harmless
WARN_ON_ONCE(), and revert 5ceb9ce6fe94. Sounds like Dave hit normally
hit his problem much before two hours, and it must be even longer now.

Ack on that plan?

        Linus
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