linux-kernel - Re: [bug] ata subsystem related crash with latest -git

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Date:	Thu, 18 Oct 2007 04:38:16 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Jens Axboe <jens.axboe@...cle.com>
CC:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [bug] ata subsystem related crash with latest -git

Jens Axboe wrote:
> On Thu, Oct 18 2007, Jeff Garzik wrote:
>> Ingo Molnar wrote:
>>> * Jens Axboe <jens.axboe@...cle.com> wrote:
>>>> --- a/drivers/scsi/scsi_lib.c
>>>> +++ b/drivers/scsi/scsi_lib.c
>>>> @@ -39,7 +39,7 @@
>>>>   * (unless chaining is used). Should ideally fit inside a single page, 
>>>> to
>>>>   * avoid a higher order allocation.
>>>>   */
>>>> -#define SCSI_MAX_SG_SEGMENTS	128
>>>> +#define SCSI_MAX_SG_SEGMENTS	129
>>> this one finally made the trick and it's booting fine now, without any 
>>> crashes!
>> Alas, this didn't help me here.  I did manage to capture the error messages 
>> this time, and in the two machines I'm actively testing on, sata_mv is the 
>> driver that's dying in both cases.  Machine A additionally has sata_nv, 
>> which is working.  Machine B additionally has ata_piix, which is working.  
>> So in both cases, its sata_mv that is throwing SError complaints:
> 
> Theory - ata_sg_is_last() isn't returning true for the last entry. Can
> you double check that it correcly marks the last entry in mv_fill_sg()?
> Alternatively, just try this patch.

Will check in a few minutes, after my current test:  I noticed that 
sg_tablesize in sata_mv is not LIBATA_MAX_PRD.  This is expected 
behavior, but I wonder if that difference -- most notably being smaller 
than SCSI_MAX_SG_SEGMENTS -- would trigger any latent bugs.

Anyway, we will both have answers momentarily...

	Jeff



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