Date: Thu, 23 Jul 2015 14:35:48 -0400
From: Tejun Heo <tj@kernel.org>
To: Alex Deucher <alexdeucher@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: ATA failure regression in kernel 4.2
Message-ID: <20150723183548.GS15934@mtj.duckdns.org>
References: <CADnq5_Nfj5rENn7+8MaKQtnevJt=ntdbjun9bxJLUUKz_D7dUQ@mail.gmail.com>
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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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