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

[Jeff Garzik <jgarzik@pobox.com>]

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:

> ata7.00: exception Emask 0x0 SAct 0x0 SErr 0x400000 action 0x6 frozen
> ata7.00: edma_err 0x04000080, EDMA self-disable
> ata7: SError: { Handshk }
> ata7.00: cmd ca/00:08:c7:40:00/00:00:00:00:00/e0 tag 0 cdb 0x0 data 4096 out
>          res 50/00:00:ce:40:00/00:00:00:00:00/e0 Emask 0x100 (unknown error)
> ata7.00: status: { DRDY }
> ata7: hard resetting link
> ata7: SATA link up 1.5 Gbps (SStatus 113 SControl 300)

Still digging...  this behavior showed up after libata changes went in, 
FWIW.

	Jeff