linux-kernel - Re: exception Emask 0x0 SAct 0x1 / SErr 0x0 action 0x2 frozen

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Date:	Fri, 10 Oct 2008 20:27:51 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
Cc:	Tejun Heo <tj@...nel.org>,
	"Mr. James W. Laferriere" <babydr@...y-dragons.com>,
	Tom Mortensen <tmmlkml@...il.com>,
	Bill Davidsen <davidsen@....com>,
	Gwendal Grignou <gwendal@...gle.com>,
	Brian Rademacher <rad@...files.net>, linux-ide@...r.kernel.org,
	linux-raid maillist <linux-raid@...r.kernel.org>,
	Linux Kernel Maillist <linux-kernel@...r.kernel.org>,
	Bruce Allen <ballen@...vity.phys.uwm.edu>,
	smartmontools-support@...ts.sourceforge.net, xfs@....sgi.com
Subject: Re: exception Emask 0x0 SAct 0x1 / SErr 0x0 action 0x2 frozen

> [420781.333189] ata6.00: cmd b0/d8:00:00:4f:c2/00:00:00:00:00/00 tag 0
>                               ^^ ^^(b0/d8)^^ ^^(4f:c2)
> [420781.333190]          res 40/00:ff:00:00:00/00:00:00:00:00/00 Emask 0x4
> (timeout)                    ^^ 40:00:ff
> [420781.333194] ata6.00: status: { DRDY }

They are the send and received task file (command blocks) for the failed
command.

> [420781.333200] ata6: hard resetting link
> [420781.638589] ata6: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
> [420781.662166] ata6.00: configured for UDMA/133
> [420781.662166] ata6: EH complete
> 
> (at the time there was little to no I/O occuring on this block device, but 
> disks on the raid5 volume were being accessed at the time, so there was 
> system activity, mainly disk reads 300-500KiB/s over ethernet)
> 
>   Nick's(?) problem:
> 
> > Nick
> > 
> > ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
> > ata1.00: cmd ea/00:00:00:00:00/00:00:00:00:00/a0 tag 0
>                 ^^ ^^ (ea/00) vs. (b0/d8) - mind are always the same (FYI)
> >         res 40/00:00:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
>                ^^ ^^ (40:00: but no ff)
> 
>            The rest of the messages are the same.  Is there any correlation
>            that can be made here?  When this happens to others, is it
>            always the same codes as shown above or do they change?  If they
>            do not change, how come they vary between users who have this
>            problem?
> 
> > ata1.00: status: { DRDY }
> > ata1: soft resetting link
> > ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
> > ata1.00: configured for UDMA/133
> > ata1: EH complete
> > sd 1:0:0:0: [sda] 2930277168 512-byte hardware sectors (1500302 MB)
> > sd 1:0:0:0: [sda] Write Protect is off
> > sd 1:0:0:0: [sda] Mode Sense: 00 3a 00 00
> > sd 1:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't
> > support DPO or FUA
> 
> Can anything be said about these errors, can we classify them into groups?
> Or are they just random? It does not appear to happen more or less with 
> one filesystem or another either, one guy is using ext3, I am using XFS-- 
> certainly something much deeper..
> 
> Justin.
> --
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