linux-kernel - Re: MSI broken in libata?

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Message-ID: <4B55130D.8070503@gmail.com>
Date:	Mon, 18 Jan 2010 20:03:57 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	Torsten Kaiser <just.for.lkml@...glemail.com>
CC:	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
	Jeff Garzik <jgarzik@...ox.com>, linux-ide@...r.kernel.org
Subject: Re: MSI broken in libata?

On 01/18/2010 02:51 PM, Torsten Kaiser wrote:
> On Sun, Jan 17, 2010 at 10:11 PM, Torsten Kaiser
> <just.for.lkml@...glemail.com>  wrote:
>> What was different between -rc4 and my earlier tests was, that there
>> where additional error messages from do_IRQ.
>
>> [  112.382903] do_IRQ: 0.165 No irq handler for vector (irq -1)
>> [  112.382923] do_IRQ: 3.165 No irq handler for vector (irq -1)
>> [  112.382939] do_IRQ: 1.165 No irq handler for vector (irq -1)
>> [  112.382957] do_IRQ: 2.165 No irq handler for vector (irq -1)
>> [  143.010051] ata2.00: exception Emask 0x0 SAct 0x3 SErr 0x0 action 0x6 frozen
>> [  143.010060] ata2.00: failed command: READ FPDMA QUEUED
>> [  143.010071] ata2.00: cmd 60/00:00:ad:71:d9/01:00:01:00:00/40 tag 0
>> ncq 131072 in
>> [  143.010073]          res 40/00:00:01:4f:c2/00:00:00:00:00/00 Emask
>> 0x4 (timeout)
>> [  143.010079] ata2.00: status: { DRDY }
>> [  143.010083] ata2.00: failed command: READ FPDMA QUEUED
>> [  143.010092] ata2.00: cmd 60/00:08:ad:70:d9/01:00:01:00:00/40 tag 1
>> ncq 131072 in
>> [  143.010095]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask
>> 0x4 (timeout)
>> [  143.010099] ata2.00: status: { DRDY }
>> [  143.010108] ata2: hard resetting link
>
>> I will look, if I can find out, where the do_IRQ error comes from and
>> why I didn't see it with -rc1 to -rc3.
>
> OK, this has nothing to do with -rc3 vs. -rc4.
> If I kill the drive with reading a 1GB file with dd, I get the above
> errors, include the one from do_IRQ.
> If I kill the drive with writing a 1GB file with dd, I do not get the
> do_IRQ error.
> As I tested the earlier -rcs only with writes, I didn't see it there.
> (Its not even in the old logs that contain the libata errors)
>
> Should I try to put some printks in arch/x86/kernel/apic/io_apic.c
> __assign_irq_vector() or is there a better way to look at the irq
> vectors?

Might not be a bad idea. Something definitely seems to be banging on 
vector 165. Any references to 165 in dmesg prior to that? I wonder where 
that is coming from..
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