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Date:	Wed, 17 Aug 2011 08:35:14 -0600
From:	Andreas Dilger <adilger@...ger.ca>
To:	Thomas Backlund <tmb@...eia.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: INFO: task jbd2/dm-0-8:3993 blocked for more than 120 seconds

On 2011-08-17, at 7:31 AM, Thomas Backlund <tmb@...eia.org> wrote:
> 
> One of our buildnodes, a 8-core Supermicro X7DA8 system,
> and a WDC WD1002FAEX-0 sata disk hits the "blocked for more than 120 seconds" several times, and ends up resetting the ata bus.
> 
> The disk does not report any errors with smart, and we have the same model in a 24-core Supermicro X8DTN, and it does not show this problem.
> 
> ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
> ata3.00: failed command: FLUSH CACHE EXT
> ata3.00: cmd ea/00:00:00:00:00/00:00:00:00:00/a0 tag 0
>         res 40/00:00:01:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
> ata3.00: status: { DRDY }
> ata3: soft resetting link
> ata3.00: configured for UDMA/133
> ata3.00: retrying FLUSH 0xea Emask 0x4
> ata3: EH complete

This is a problem with your disk hardware. 

Cheers, Andreas--
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