Re: System freezes with kernel >2.6.19 - sata_nv [added crash info kern 2.6.21.1]

[Tejun Heo <htejun@gmail.com>]

Robert Hancock wrote:
> Stefan wrote:
>> Okay, I had time to set this up. I'm attaching the log messages I got
>> via netconsole.
>>
>> I tested about 20h with adma disabled, the crash won't occur.
>>
>> If I remove
>>
>> sata_nv.adma=0
>>
>> from boot options again it doesn't take long until my machine locks up.
>>
>> [Attached dmesg output with 2.6.21.1 kernel + crash info I got via
>> netconsole]
>>
>> I hope this is useful to you guys.
> 
> It looks like you've got SError bits set from the controller, 0x200000
> means link layer CRC error (btw, we really should be decoding that error
> and printing it in human readable form rather than making people pore
> through the SATA spec and count bits).

Hmmm... Maybe, but most of the bits are nearly meaningless to end users
anyway.

> First thing you should try is replacing the SATA cable to that drive.

Yeap, please apply some hardware debugging techniques - replacing /
reseating SATA cables and connecting it to different power connector.
But it's disturbing to see machine lock up even if CRC error occurs.
sata_nv non-adma interface locks the whole machine up too after certain
error conditions but I thought adma was saner than that.  I hope we can
work around this somehow.

Thanks.

-- 
tejun