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

[Jeff Garzik <jeff@garzik.org>]

Jens Axboe wrote:
> On Thu, Oct 18 2007, Jeff Garzik wrote:
> > Ingo Molnar wrote:
> > > * Jens Axboe <jens.axboe@oracle.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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