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

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Date:	Fri, 31 Aug 2012 11:51:48 +0200
From:	Stefan Priebe - Profihost AG <s.priebe@...fihost.ag>
To:	Jan Kara <jack@...e.cz>
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

Am 31.08.2012 11:28, schrieb Jan Kara:
>    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?

The main disk is XFS. The backup disk is ext4. The backup disk is doing 
nothing else than this SINGLE rsync task / process. So the only I/O is 
rsync itself.

So i don't expect low performance as the main disk is XFS ;-)

Greets,
Stefan
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