linux-kernel - Re: ftruncate-mmap: pages are lost after writing to mmaped file.

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Message-ID: <20090319170630.GA9119@duck.suse.cz>
Date:	Thu, 19 Mar 2009 18:06:30 +0100
From:	Jan Kara <jack@...e.cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	Ying Han <yinghan@...gle.com>, Jan Kara <jack@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, guichaz@...il.com,
	Alex Khesin <alexk@...gle.com>,
	Mike Waychison <mikew@...gle.com>,
	Rohit Seth <rohitseth@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: ftruncate-mmap: pages are lost after writing to mmaped file.

On Thu 19-03-09 18:03:40, Jan Kara wrote:
> On Thu 19-03-09 09:51:59, Linus Torvalds wrote:
> > 
> > 
> > On Fri, 20 Mar 2009, Nick Piggin wrote:
> > > 
> > > Yeah, probably no need to hold private_lock while tagging the radix
> > > tree (which is what my version did). So maybe this one is a little
> > > better. I did test mine, it worked, but it didn't solve the problem.
> > 
> > Ahh, so you re-created it? On ext2 only, or is it visible on ext3 as well? 
> > I've not even tested - I assumed that I would have to boot into less 
> > memory and downgrade my filesystem to ext2, which made me hope somebody 
> > else would pick it up first ;)
>   In thread http://lkml.org/lkml/2009/3/4/179 I've reported similar problem
> - write lost. I'm able to reproduce under UML linux at will. ext3 takes
> with 1KB blocksize about 20 minutes to hit the corruption, ext2 with 1 KB
> blocksize about an hour, ext2 with 4KB blocksize several hours...
  And BTW HP is reporting to us a similarly looking problem on reiserfs on
ia64 with SLE11 (2.6.27 based). But that takes several days to reproduce
with their proprietary test suite.

									Honza
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