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SubjectRe: ATA failure regression in kernel 4.2
Hello,

On Thu, Jul 23, 2015 at 01:48:24PM -0400, Alex Deucher wrote:
> Something new in kernel 4.2 seems to have broken one of my hard drives
> (ssd) in kernel 4.2. 4.1 and older kernels work fine. Here are the
> relevant logs.
>
...
> [ 6.547628] ata2.00: qc timeout (cmd 0xec)
> [ 6.547721] ata2.00: failed to IDENTIFY (I/O error, err_mask=0x4)
> [ 7.007213] ata2: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
> [ 16.997819] ata2.00: qc timeout (cmd 0xec)
> [ 16.997910] ata2.00: failed to IDENTIFY (I/O error, err_mask=0x4)
> [ 16.997995] ata2: limiting SATA link speed to 3.0 Gbps
> [ 17.457400] ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
> [ 47.429257] ata2.00: qc timeout (cmd 0xec)
> [ 47.429349] ata2.00: failed to IDENTIFY (I/O error, err_mask=0x4)
> [ 47.888822] ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 320)

Nothing really rings a bell. Timeouts on IDENTIFY. Could be IRQ
related. Which controller is it (lspci -nn)? Also, can you try to
bisect the issue?

Thanks.

--
tejun


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