linux-kernel - Re: 2.6.29 regression: ATA bus errors on resume

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Date:	Thu, 02 Apr 2009 16:15:34 +0200
From:	Niel Lambrechts <niel.lambrechts@...il.com>
To:	Tejun Heo <tj@...nel.org>
CC:	"linux.kernel" <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.29 regression: ATA bus errors on resume

On 04/02/2009 01:03 PM, Niel Lambrechts wrote:
> On 04/02/2009 08:52 AM, Tejun Heo wrote:
>   
>> Niel Lambrechts wrote:
>>   
>>     
>>>> Attached is the debug patch.  Please reproduce the problem with the
>>>> patch applied and post full kernel log.
>>>>   
>>>>       
>>>>         
>>> Hi there,
>>>
>>> Here is the output, it took 2 attempts to reproduce the EXT4 corruption
>>> (clean with errors).
>>>     
>>>       
>> Strange.  Maybe IO commands are getting through while the sdev is
>> still in quiesce state?  Can you please repeat the test with the
>> attached patch?
>>   
>>     
> Hi Tejun,
>
> Thanks for your help, I've done at least 5 hibernate cycles without the
> problem recurring, I'll keep at it for a while... :)
>
> For the sake of being thorough, I'd like to mention some of the
> remaining issues/messages, but to be honest some of them were there
> before and may not be relevant to your efforts:
>
> 1) Can you perhaps confirm if the remaining ATA messages are harmless
> enough to ignore?
>
> dmesg:
> ata2: exception Emask 0x10 SAct 0x0 SErr 0x4050000 action 0x1e frozen
> ata2: irq_stat 0x00400040, connection status changed
> ata2: SError: { PHYRdyChg CommWake DevExch }
> Clocksource tsc unstable (delta = -412838835 ns)
>
> and in messages:
> Apr  2 12:31:44 linux-7vph kernel: ata1: exception Emask 0x10 SAct 0x0
> SErr 0x0 action 0x9 t4
>
> 2) The screen remains blank on resume, right until I both press a key
> _and_ touch the touchpad. Weird, but this happens in 2.6.28.9 as well,
> perhaps this is i915 related.
>
> Thanks very much for sorting the more serious issue so quickly!
>
> Regards,
> Niel
>   
UPDATE:

Just arrived back home, before suspending I enabled all the powertop
laptop mode/SATA link management etc and I removed a CD-ROM from the CD
drive so I'm not sure what could be responsible for this:

ata2.00: XXX setting retry on qc0
ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
ata2.00: irq_stat 0x40000001
ata2.00: XXX terminating qc0 (SENSE), retries=0
XXX scsi_eh_flush_done_q: online=1(2) noretry=0 retries=3 allowed=3
scsi_eh_1: flush finish cmd: f5dea740
ata2.00: XXX setting retry on qc0
ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
ata2.00: irq_stat 0x40000001
ata2.00: XXX terminating qc0 (SENSE), retries=0
XXX scsi_eh_flush_done_q: online=1(2) noretry=0 retries=2 allowed=2
.. loop ..

I hope it's simply something like "drive not ready" debugging ouput,
since ata2 seems associated with the CD-Rom drive... :)

This continued, until I again in powertop enabled SATA link management.

The full dmesg is attached...

Niel


View attachment "dmesg-p2-2.txt" of type "text/plain" (123419 bytes)