linux-kernel - Re: -mm merge plans for 2.6.20

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Message-ID: <458776A5.3060007@yahoo.com.au>
Date:	Tue, 19 Dec 2006 16:20:37 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Dave Jones <davej@...hat.com>
CC:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	Hugh Dickins <hugh@...itas.com>,
	Chris Rankin <cj.rankin@...world.com>
Subject: Re: -mm merge plans for 2.6.20

Dave Jones wrote:

> Eeek! page_mapcount(page) went negative! (-2)

Hmm, probably happened once before, too.

>   page->flags = 404

What's that? PG_referenced|PG_reserved? So I'd say it is likely
that some driver has got its refcounting wrong.

Unfortunately, this debugging output is almost useless when it
comes to trying to track down the problem any further.

And I see we've got another report for 2.6.19.1 from Chris, which
is equally vague.

IMO the pattern is much too consistent to be able to attribute
them all to hardware problems. And considering it takes so long
for these things to appear, can we get something like the attached
patch upstream at least until we manage to stamp them out? Any
other debugging info we can add?

-- 
SUSE Labs, Novell Inc.

View attachment "mm-rmap-debug-more.patch" of type "text/plain" (4147 bytes)