linux-ext4 - Re: ext4 hung tasks in linux-stable 3.0.41

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Date:	Fri, 31 Aug 2012 11:28:59 +0200
From:	Jan Kara <jack@...e.cz>
To:	Stefan Priebe - Profihost AG <s.priebe@...fihost.ag>
Cc:	stable@...r.kernel.org, Greg KH <gregkh@...uxfoundation.org>,
	Theodore Tso <tytso@....EDU>, adilger.kernel@...ger.ca,
	linux-ext4@...r.kernel.org
Subject: Re: ext4 hung tasks in linux-stable 3.0.41

  Hello,

On Fri 31-08-12 09:43:37, Stefan Priebe - Profihost AG wrote:
> i'm expected every night a hang of my rsync backup process, doing a
> backup to an ext4 filesystem. Always throwing Call traces.
> 
> The hung task messages are really long so i posted it to pastebin:
> http://pastebin.com/raw.php?i=9v7HEvjA
> 
> Used kernel: vanilla 3.0.41
> 
> Is this problem known? Or is there a fix for 3.0.X available?
  From a quick look, processes are waiting for IO so it may be that your
disk is just loaded... Did it start happening after some change? Or do you
experience unexpectedly low performance?

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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