linux-kernel - Re: Samsung N130 ATA exception after 5min uptime -- Phoenix FailSafe issue?

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Date:	Mon, 30 Nov 2009 11:21:04 +0100
From:	Johannes Stezenbach <js@...21.net>
To:	Tejun Heo <tj@...nel.org>
Cc:	Greg KH <greg@...ah.com>, Robert Hancock <hancockrwd@...il.com>,
	Mikhail Malygin <mmalygin@....de>,
	Hans Werner <hwerner4@....de>,
	Thomas Renninger <trenn@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: Samsung N130 ATA exception after 5min uptime -- Phoenix
 FailSafe issue?

On Mon, Nov 30, 2009 at 05:52:59PM +0900, Tejun Heo wrote:
> On 11/29/2009 09:51 AM, Johannes Stezenbach wrote:
> > On Sat, Nov 28, 2009 at 04:17:45PM -0800, Greg KH wrote:
> >> On Sat, Nov 28, 2009 at 11:22:03PM +0100, Johannes Stezenbach wrote:
> >>>
> >>> BTW, at 5min after boot it is 99% guaranteed that this ATA
> >>> exception will happen during the occasional fsck. That
> >>> doesn't feel right.
> >>
> >> Well, I've never been doing a fsck at 5 minutes into boot, and neither do
> >> most Windows users :)
> > 
> > I've been through a lot of reboots with all the testing, and
> > the fsck took longer than 5min, and the ATA exception  struck.
> > fsck continued after the 30 second stall and succeeded.
> 
> The timeout will happen if the C state switching happens while ATA
> command is in flight so unless there's heavy IO load, it's not very
> likely to hit.

I've booted with rdinit=/bin/sh (busybox sh in initramfs), so
nothing accesses the disk.  After 5min the C state switch
happens, but no ATA exception. I waited a few more miniutes
and then used dd if=/dev/sda of=/dev/null  -> ATA exception.
There is no way to escape it.


Johannes
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