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

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Message-ID: <alpine.LSU.2.00.1206031812380.5143@eggly.anvils>
Date:	Sun, 3 Jun 2012 18:18:39 -0700 (PDT)
From:	Hugh Dickins <hughd@...gle.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
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, 3 Jun 2012, Linus Torvalds wrote:
> 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.

You wouldn't want me to say that I think you're right,
it would impudently suggest that I might conceive of you being wrong.
I sigh for your heavy burden.

> 
> 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?

Sure, ack from me on that plan.

Hugh
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