linux-kernel - Re: [PATCH 1/1] um: ubd: Fix data corruption

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Date:	Thu, 14 Oct 2010 23:24:34 +0200
From:	Richard Weinberger <richard@....at>
To:	Tejun Heo <htejun@...il.com>
Cc:	"richard -rw- weinberger" <richard.weinberger@...il.com>,
	Chris Frey <cdfrey@...rsquare.net>,
	Jens Axboe <jaxboe@...ionio.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"jdike@...toit.com" <jdike@...toit.com>,
	"user-mode-linux-devel@...ts.sourceforge.net" 
	<user-mode-linux-devel@...ts.sourceforge.net>,
	"user-mode-linux-user@...ts.sourceforge.net" 
	<user-mode-linux-user@...ts.sourceforge.net>,
	"janjaap@....nl" <janjaap@....nl>,
	"geert@...ux-m68k.org" <geert@...ux-m68k.org>,
	"martin.petersen@...cle.com" <martin.petersen@...cle.com>,
	"adobriyan@...il.com" <adobriyan@...il.com>,
	"syzop@...nscan.org" <syzop@...nscan.org>
Subject: Re: [PATCH 1/1] um: ubd: Fix data corruption

Hi!

Am Donnerstag 14 Oktober 2010, 20:03:40 schrieb Tejun Heo:
> Hello,
> 
> On 10/14/2010 04:20 PM, richard -rw- weinberger wrote:
> > It does not work for me.
> > But the error is a different one. :-)
> > Without your patch I've never got this kernel trace.
> > 
> > [   59.850000] kworker/0:1: page allocation failure. order:0, mode:0x20
> 
> Hmm... you're seeing out of memory condition.  If the code screws up
> filesystem access, I suppose it could make that happen too but can you
> please check the configuration just in case (especially the memory
> size)?  Also, if you can reliably reproduce the filesystem corruption
> w/o the patch, can you please tell me how to do it?
> 

After rerunning my test case a few times with exactly the same configuration I 
was unable to reproduce neither a filesystem corruption nor a allocation 
failure.
Your patch seems to fix the issue.

Sorry for the false negative!

BTW: This is my test case:
tar xvf linux-2.6.36-rc7.tar.bz2 && rm linux-2.6.36-rc7.tar.bz2 && tar cvf 
linux-2.6.36-rc7.tar.bz2 linux-2.6.36-rc7/ && rm -rf linux-2.6.36-rc7/
Any big tar archive will do the job...

Thanks,
//richard
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