Generic timeout warnings begin after v2.6.25 but before v2.6.26-rc1 [Was: DRDY ata message > 2.6.24.7-rt14, not before.]

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On Fri, Feb 27, 2009 at 3:54 PM, Jeff Garzik <jgarzik@xxxxxxxxx> wrote:
> Avuton Olrich wrote:
>>
>> ata4.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
>> ata4.00: cmd 35/00:10:b0:70:75/00:00:1f:00:00/e0 tag 0 dma 8192 out
>>         res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
>
>
> Since you are seeing generic timeouts, without additional information, I
> would guess either a problem with interrupt delivery (not uncommon in -rt
> kernels) or you need to force your drives to 1.5Gbps.
>
>        Jeff

OK, I have tried to bisect it (completely without -rt) and it breaks
completely somewhere on the outer limits of this bug. Unfortunately,
there was an unrelated libata bug which made it where 4 of my drives
were not recognized, and since the drive that has this general timeout
issue with linux is dedicated to an lvm I depend on those other drives
so I can mount the lvm so I can reproduce this bug.

What I do know:

Good: v2.6.25
Bad: pre v2.6.26-rc1 (9752082560b440e6a45624569d26802e20d1b8b4)

Please, How can I help further?
-- 
avuton
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