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@xxxxxxxxxx> 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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