linux-kernel - Re: [patch] fix data corruption bug in __block_write_full

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Message-ID: <20070102112054.GC22657@infradead.org>
Date:	Tue, 2 Jan 2007 11:20:54 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...l.org>,
	Segher Boessenkool <segher@...nel.crashing.org>,
	David Miller <davem@...emloft.net>, nickpiggin@...oo.com.au,
	kenneth.w.chen@...el.com, guichaz@...oo.fr, hugh@...itas.com,
	linux-kernel@...r.kernel.org, ranma@...edrich.de,
	gordonfarquharson@...il.com, akpm@...l.org, a.p.zijlstra@...llo.nl,
	tbm@...ius.com, arjan@...radead.org, andrei.popa@...eo.ro
Subject: Re: [patch] fix data corruption bug in __block_write_full_page()

On Fri, Dec 29, 2006 at 01:19:46PM +0100, Ingo Molnar wrote:
> i've extended the tracer in -rt to trace all relevant pagetable, 
> pagecache, buffer-cache and IO events and coupled the tracer to your 
> test.c code. The corruption happens here:
> 
>     test-2126  0.... 3756170us+: trace_page (cf20ebd8 b6a2c000 0)
>  pdflush-2006  0.... 6432909us+: trace_page (cf20ebd8 b6a2c000 4200420)
>     test-2126  0.... 8135596us+: trace_page (cf20ebd8 b6a2c000 4200420)
>     test-2126  0D... 9012933us+: do_page_fault (8048900 4 b6a2c000)
>     test-2126  0.... 9023278us+: trace_page (cf262f24 b6a2c000 0)
>     test-2126  0.... 9023305us > sys_prctl (000000d8 b6a2c000 000000ac)

This tracer definitly looks interesting.  Could you send a splitout
patch with it to lkml for review?

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