linux-kernel - Re: [uml-devel] [REGRESSION] um: ubd: block layer issue (Was: ext3 filesystem corruption in user mode linux)

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Date:	Tue, 28 Sep 2010 19:07:28 +0200
From:	Janjaap Bos <janjaap@....nl>
To:	richard -rw- weinberger <richard.weinberger@...il.com>
Cc:	tj@...nel.org, axboe@...nel.dk, mike.miller@...com,
	user-mode-linux-devel@...ts.sourceforge.net,
	adrian@...en.demon.co.uk, jdike@...toit.com,
	LKML <linux-kernel@...r.kernel.org>, grant.likely@...retlab.ca,
	Geert.Uytterhoeven@...ycom.com, Chris Frey <cdfrey@...rsquare.net>
Subject: Re: [uml-devel] [REGRESSION] um: ubd: block layer issue (Was: ext3
 filesystem corruption in user mode linux)

See attached patch, and earlier message posted in March 2010 on uml user
list. We are out of maintainer...

Best,

-Janjaap



On Tue, 2010-09-28 at 18:16 +0200, richard -rw- weinberger wrote:
> Hi Tejun!
> 
> Chris Frey ran into some problems with ext3 on UML.
> See: http://marc.info/?i=20100924041410.GA18040%20()%20foursquare%20!%20net
> 
> I can reproduce this issue with any file system on Linux >= 2.6.31.
> There seems to be a serious problem with the block layer on UML.
> Under high load any file system gets corrupted.
> 
> The regression was most likely introduced with this three changes:
> 83096ebf1263b2c1ee5e653ba37d993d02e3eb7b (block: convert to pos and
> nr_sectors accessors)
> f81f2f7c9fee307e371f37424577d46f9eaf8692 (ubd: drop unnecessary
> rq->sector manipulation)
> 4d6c84d91d1a539ebc47d1a36a35e9390ba11fdc (ubd: cleanup completion path)
> 
> Maybe only f81f2f7 is the bad one. They depend on each and I don't
> know all the internals...
> 


View attachment "v2.6.33.diff" of type "text/x-patch" (4561 bytes)