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Date: Tue, 2 Jan 2007 11:20:54 +0000
From: Christoph Hellwig <hch@infradead.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Linus Torvalds <torvalds@osdl.org>,
       Segher Boessenkool <segher@kernel.crashing.org>,
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       tbm@cyrius.com, arjan@infradead.org, andrei.popa@i-neo.ro
Subject: Re: [patch] fix data corruption bug in __block_write_full_page()
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References: <Pine.LNX.4.64.0612281125100.4473@woody.osdl.org> <20061228114517.3315aee7.akpm@osdl.org> <Pine.LNX.4.64.0612281156150.4473@woody.osdl.org> <20061228.143815.41633302.davem@davemloft.net> <3d6d8711f7b892a11801d43c5996ebdf@kernel.crashing.org> <Pine.LNX.4.64.0612282155400.4473@woody.osdl.org> <20061229121946.GA17837@elte.hu>
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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?