linux-kernel - What is HSM violation? Causing ata1.00 hard resetting link

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Date:	Thu, 17 Jun 2010 14:05:32 +0800 (SGT)
From:	Jeff Chua <jeff.chua.linux@...il.com>
To:	Robert Hancock <hancockrwd@...il.com>,
	Jeff Garzik <jgarzik@...hat.com>, Greg KH <greg@...ah.com>,
	kristen.c.accardi@...el.com, Dely Sy <dely.l.sy@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Matthew Wilcox <willy@...com>
Subject: What is HSM violation? Causing ata1.00 hard resetting link


Hi,

I just got an external e-SATA hard disk, and I'm testing for backup.

When I tried to "tar" 90GB to it, it caused a HSM violation, and since 
this
is the root file system, system is brain-dead. "Bus error" for every 
command
issued!


Error is (typed as was captured in the screen) ...

ata1.00: exception Emask 0x2 SAct 0x7 SErr 0x3000400 action 0x6
ata1.00: irq_stat 0x44000008
ata1.00: cmd 60/30:00:37:b0:84/00:00:17:00:00/40 tag 0 ncq 24576 in
        res 40/00:08:6f:b0:84/00:00:17:00:00/40 Emask 0x2 (HSM violation)
ata1.00: cmd 60/50:08:6f:b0:84/00:00:17:00:00/40 tag 1 ncq 40960 in
        res 51/04:00:6f:b0:84/00:00:17:00:00/40 Emask 0x403 (HSM violation)
ata1.00: cmd 60/00:10:bf:b0:84/01:00:17:00:00/40 tag 2 ncq 131072 in
        res 40/00:08:6f:b0:84/00:00:17:00:00/40 Emask 0x2 (HSM violation)
ata1: hard resetting link
ata1: softreset failed (device not ready)
ata1: hard resetting link
ata1: softreset failed (device not ready)
ata1: hard resetting link
ata1: link is slow to respond, please be patient (ready=0)


Running on SSD on Linux 2.6.35-rc3.

This does not happen all the time, but I've seen this if it's copying
intensively.

Thanks,
Jeff.
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