linux-ext4 - Re: [PATCH] ext2: Fix data corruption for racing writes

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Message-Id: <20090409133030.a7ea94c7.akpm@linux-foundation.org>
Date:	Thu, 9 Apr 2009 13:30:30 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jan Kara <jack@...e.cz>
Cc:	yinghan@...il.com, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org, yinghan@...gle.com,
	nickpiggin@...oo.com.au
Subject: Re: [PATCH] ext2: Fix data corruption for racing writes

On Mon, 6 Apr 2009 12:23:29 +0200
Jan Kara <jack@...e.cz> wrote:

> > 
> > I tried this patch and seems i got deadlock on the truncate_mutex.
> > Here is the message after enabling lockdep. I pasted the same message
> > on the origianal thread.
>
> ...
>
>   I don't think this is a deadlock (or is the machine hung?). The thread
> was just waiting for a long time. I'd think that you'll occasionally get
> exactly the same message even without my patch if you stress the machine
> like you do.
>  

Well, it's easy to tell the difference

deadlock: system never recovers
long-sucky-delay: system eventually recovers.

Which was it??
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