linux-kernel - Re: [BUG]2.6.27.y some contents lost after writing to mmaped file

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Date:	Tue, 17 Nov 2009 07:36:22 -0500
From:	Chris Mason <chris.mason@...cle.com>
To:	Greg KH <gregkh@...e.de>
Cc:	JiSheng Zhang <jszhang3@...il.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, stable@...nel.org, jack@...e.cz
Subject: Re: [BUG]2.6.27.y some contents lost after writing to mmaped file

On Mon, Nov 16, 2009 at 05:56:55PM -0800, Greg KH wrote:
> On Mon, Nov 16, 2009 at 11:38:57AM +0800, JiSheng Zhang wrote:
> > Hi,
> > 
> > I triggered a failure in an fs test with fsx-linux from ltp. It seems that
> > fsx-linux failed at mmap->write sequence.
> > 
> > Tested kernel is 2.6.27.12 and 2.6.27.39
> 
> Does this work on any kernel you have tested?  Or is it a regression?
> 
> > Tested file system: ext3, tmpfs.
> > IMHO, it impacts all file systems.
> > 
> > Some fsx-linux log is:
> > 
> > READ BAD DATA: offset = 0x2771b, size = 0xa28e
> > OFFSET  GOOD    BAD     RANGE
> > 0x287e0 0x35c9  0x15a9     0x80
> > operation# (mod 256) for the bad datamay be 21
> > ...
> > 7828: 1257514978.306753 READ     0x23dba thru 0x25699 (0x18e0 bytes)
> > 7829: 1257514978.306899 MAPWRITE 0x27eeb thru 0x2a516 (0x262c bytes)
> >  ******WWWW
> > 7830: 1257514978.307504 READ     0x2771b thru 0x319a8 (0xa28e bytes)
> >  ***RRRR***
> > Correct content saved for comparison
> > ...
> 
> Are you sure that the LTP is correct?  It wouldn't be the first time it
> wasn't...

I'm afraid fsx usually finds bugs.  I thought Jan Kara recently fixed
something here in ext3, does 2.6.32-rc work?

-chris

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