linux-ext4 - Re: a suspected data race bug in Ext4 file system

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Message-Id: <20081106185109.ce8be9b8.akpm@linux-foundation.org>
Date:	Thu, 6 Nov 2008 18:51:09 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	=?UTF-8?Q? "=ED=99=8D=EC=8B=A0_shin_hong" ?= <hongshin@...il.com>
Cc:	adilger@....com, linux-ext4@...r.kernel.org
Subject: Re: a suspected data race bug in Ext4 file system

On Fri, 7 Nov 2008 11:09:49 +0900 "______ shin hong" <hongshin@...il.com> wrote:

> Dear Ext4 maintainer,
> 
> I found a suspected data race bug at ext4_release_file() in ext4/file.c .
> 
> Is it necessary to re-check whether the if-statement's
> condition(atomic_read(&inode->i_writecount) == 1) is satisifed after
> semaphore down operation?
> 
> It seems to use "test and test and set" pattern(double-checking)
>  but the second "test" seems to be missed.
> 
> Please examine this function. Thank you.
> 
> p.s. I sent the same report to sct@...hat.com. But I did not received
> any reply.
>        I think my mail was discarded so I am sending the same again.
> 

An appropriate way to report this possible bug is to Cc: the ext4 mailing
list, which I have cc'ed here.

Thanks.
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