From: Robert Hancock <hancockr@shaw.ca>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: enricoss@tiscali.it, linux-kernel@vger.kernel.org,
linux-ide@vger.kernel.org, Jeff Garzik <jeff@garzik.org>,
Tejun Heo <htejun@gmail.com>
Subject: Re: hsm violation
Date: Sun, 24 Jun 2007 13:42:01 -0600 [thread overview]
Message-ID: <467EC909.9040006@shaw.ca> (raw)
In-Reply-To: <fa.19XJG1Asdp1zwcWLxolIH6F+5lY@ifi.uio.no>
Andrew Morton wrote:
> On Sun, 24 Jun 2007 14:32:22 +0200 Enrico Sardi <enricoss@tiscali.it> wrote:
>> [ 61.176000] ata1.00: exception Emask 0x2 SAct 0x2 SErr 0x0 action 0x2
>> frozen
>> [ 61.176000] ata1.00: (spurious completions during NCQ issue=0x0
>> SAct=0x2 FIS=005040a1:00000004)
..
>
> It's not obvious (to me) whether this is a driver bug, a hardware bug,
> expected-normal-behaviour or what - those diagnostics (which we get to
> see distressingly frequently) are pretty obscure.
The spurious completions during NCQ error is indicating that the drive
has indicated it's completed NCQ command tags which weren't outstanding.
It's normally a result of a bad NCQ implementation on the drive.
Technically we can live with it, but it's rather dangerous (if it
indicates completions for non-outstanding commands, how do we know it
doesn't indicate completions for actually outstanding commands that
aren't actually completed yet..)
--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/
next parent reply other threads:[~2007-06-24 19:42 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fa.sspu6LOivd/touNtS2IsMKPqHa0@ifi.uio.no>
[not found] ` <fa.19XJG1Asdp1zwcWLxolIH6F+5lY@ifi.uio.no>
2007-06-24 19:42 ` Robert Hancock [this message]
2007-06-25 2:12 ` hsm violation Tejun Heo
2007-06-25 2:28 ` [PATCH 2.6.22-rc5] libata: add HTS541616J9SA00 to NCQ blacklist Tejun Heo
2007-06-25 2:39 ` Robert Hancock
2007-06-25 2:49 ` Tejun Heo
2007-06-25 3:47 ` Petr Vandrovec
2007-06-25 4:05 ` Tejun Heo
2007-06-25 4:10 ` Robert Hancock
2007-06-25 4:22 ` Petr Vandrovec
2007-06-25 4:29 ` Tejun Heo
2007-07-02 7:12 ` Tejun Heo
2007-07-02 14:14 ` Jeff Garzik
[not found] <467E6456.4030503@tiscali.it>
2007-06-24 19:30 ` hsm violation Andrew Morton
2007-06-25 2:15 ` Tejun Heo
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