Message-ID: <4D362DD2.8070606@gmail.com>
Date:	Tue, 18 Jan 2011 18:18:26 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	Dmitry <dmonakhov@...nvz.org>
CC:	John Tyree <johntyree@...il.com>, Theodore Ts'o <tytso@....edu>,
	Eric Sandeen <sandeen@...hat.com>,
	Jiaying Zhang <jiayingz@...gle.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	ide <linux-ide@...r.kernel.org>
Subject: Re: PROBLEM: Disk continually remounts and hardlocks the entire system
 if running on battery.

(CCing linux-ide)

On 01/18/2011 04:14 PM, Dmitry wrote:
> On Tue, 18 Jan 2011 22:46:34 +0100, John Tyree<johntyree@...il.com>  wrote:
>> [1.] Disk continually remounts and hardlocks the entire system if running on
>> battery.
>>
>> [2.] When I unplug the power cord from laptop, the harddrive immediately
>> stops spinning and nothing happens for up to ten seconds or more. During
>> this
>> time, absolutely nothing works except the mouse moving around in X.
>> Applications do not redraw their guis, Can't launch anything or close
>> anything. Just have to wait until it remounts and I hear the drive spin up.
>> At that time, everything snaps back to life as if nothing has happened.
>>
>> dmesg shows the following:
> oh, just look at ata errors, definitely this is not fs's problem,
> it's looks like your disk is dieing, Your options:
> 1) plug/unplug sata cable :), in my experience this is the root of cause
>     in 50% of cases.
> 2) smart ctl logs
>>
>> [28687.441335] ata1.00: configured for UDMA/33
>> [28687.441345] ata1: EH complete
>> [28687.443153] sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled,
>> doesn't support DPO or FUA
>> [28688.563053] EXT4-fs (sda5): re-mounted. Opts: commit=600
>> [28688.570501] EXT4-fs (dm-0): re-mounted. Opts: commit=600
>> [28727.760100] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x110000 action
>> 0x6 frozen
>> [28727.760115] ata1: SError: { PHYRdyChg Dispar }
>> [28727.760126] ata1.00: failed command: WRITE DMA EXT
>> [28727.760144] ata1.00: cmd 35/00:08:5d:8b:e1/00:00:17:00:00/e0 tag 0 dma
>> 4096 out
>> [28727.760148]          res 40/00:f4:00:00:00/00:00:00:00:00/40 Emask 0x4
>> (timeout)
>> [28727.760156] ata1.00: status: { DRDY }
>> [28727.760170] ata1: hard resetting link
>> [28728.066096] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
>> [28728.067819] ata1.00: configured for UDMA/33
>> [28728.068309] ata1.00: device reported invalid CHS sector 0
>> [28728.068337] ata1: EH complete
>> [28730.395512] ata1.00: configured for UDMA/33
>> [28730.395520] ata1: EH complete
>> [28730.430938] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled,
>> doesn't support DPO or FUA
>> [28730.953631] EXT4-fs (sda5): re-mounted. Opts: commit=0
>> [28730.958914] EXT4-fs (dm-0): re-mounted. Opts: commit=0
>>
>> This happens everytime the power is unplugged and continutes to happen, with
>> the harddrive spinning up and working for about 10 seconds before it happens
>> again. When the power is plugged back in, everything goes right back to
>> normal. This started with vanilla 2.6.37 from linus's git. I thought it
>> might
>> have something to do with laptop-mode, but disabling it did not change
>> anything.

Hmm, it seems like there's some kind of glitch happening on the SATA 
link. In this case it looks like PHY ready change event(s) happened. I 
would tend to suspect this being some kind of hardware problem. Are you 
sure this doesn't occur on older kernels?
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