Re: PROBLEM: Disk continually remounts and hardlocks the entire system if running on battery.

[Tejun Heo <tj@kernel.org>]

On Wed, Jan 19, 2011 at 01:14:30AM +0300, Dmitry wrote:
> On Tue, 18 Jan 2011 22:46:34 +0100, John Tyree <johntyree@gmail.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.

Please attach full kernel log after such event including the boog
messages.

Thanks.

-- 
tejun