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Gmane
From: Tejun Heo <htejun <at> gmail.com>
Subject: Re: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
Newsgroups: gmane.linux.ide
Date: Tuesday 23rd October 2007 09:55:55 UTC (over 9 years ago)
Hello,

Steen Eugen Poulsen wrote:
> Sep 28 04:32:40 locker ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0
> action 0x2 frozen
> Sep 28 04:32:40 locker ata1.00: cmd b0/d2:f1:00:4f:c2/00:00:00:00:00/00
> tag 0 cdb 0x0 data 123392 in
> Sep 28 04:32:40 locker res 50/00:f1:00:4f:c2/00:00:00:00:00/00 Emask
> 0x202 (HSM violation)
[--snip--]
> Another machine:
> 
> Sep 28 03:47:55 dragonslair ata1.00: exception Emask 0x0 SAct 0x0 SErr
> 0x0 action 0x2 frozen
> Sep 28 03:47:55 dragonslair ata1.00: cmd
> b0/db:f8:00:4f:c2/00:00:00:00:00/00 tag 0 cdb 0x0 data 126976 in
> 
> Sep 28 03:47:55 dragonslair res 50/00:f8:00:4f:c2/00:00:00:00:00/00
> Emask 0x202 (HSM violation)
[--snip--]
> Sep 28 04:33:52 liferaft kernel: ata1.00: exception Emask 0x0 SAct 0x0
> SErr 0x0 action 0x2 frozen
> Sep 28 04:33:55 liferaft kernel: ata1.00: cmd
> b0/d2:f1:00:4f:c2/00:00:00:00:00/00 tag 0 cdb 0x0 data 123392 in
> Sep 28 04:33:55 liferaft kernel:          res
> 50/00:f1:00:4f:c2/00:00:00:00:00/00 Emask 0x202 (HSM violation)
> Sep 28 04:33:55 liferaft kernel: ata1: soft resetting port
> Sep 28 04:33:55 liferaft kernel: ata1: SATA link up 3.0 Gbps (SStatus
> 123 SControl 300)
> Sep 28 04:33:55 liferaft kernel: ata1.00: configured for UDMA/133
> Sep 28 04:33:55 liferaft kernel: ata1: EH complete

All these are caused by smartd.  Updating should fix the problem.

> Note 2: The hardware didn't freeze for me and I believe the freeze is do
> to swap breaking due to the errors.

Above HSM violations should be harmless other than those messages.
libata resets the devices and should just go on.

> Note 3: dragonslair's harddisk actually crashed, kernel didn't die, it
> just remounted read only. Reboot and the disk was missing, more reboot
> and the machine started with all disks running again, been stable since
> the 28th Sep. (knock on wood)

libata EH can't really recover from actual hardware failures but some
drives come back on if you hot unplug and then replug it.

-- 
tejun
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