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

[Mark Lord <lkml@rtr.ca>]

Jens Axboe wrote:
> On Thu, Oct 18 2007, Mark Lord wrote:
> > Jens Axboe wrote:
> > > On Thu, Oct 18 2007, Mark Lord wrote:
> > > > Jens Axboe wrote:
> > > > > On Thu, Oct 18 2007, Jeff Garzik wrote:
> > > > > > Mark Lord wrote:
> > > > > > > Okay, mine is dying with EIP at blk_rq_map_sg+0xcb/0x160.
> > > > > > > Screen photo is at http://rtr.ca/recent/2.6.23-git12-crash.jpg,
> > > > > > > but the top was cut off (isn't there a new config option or patch
> > > > > > > to do double-columns or scrollback or something ???.
> > > > > > Is this a sata_mv box?  If so, could you try this patch?
> > > > > If anything, that shrinks the size of the resulting request. Did this
> > > > > patch make any difference to you?
> > > > Not a sata_mv box, so no point here.
> > > Can you try the big patch I just posted?
> > I'll hunt for it and try it, but your earlier little patch already works 
> > fine.

I found the latest rev, and it failed to apply cleanly on -git12 or -git13
due to scsi_lib.c. After fixing that portion (replacement chunk below),
I'm now running with -git12, with the sg list debug option enabled (no messages).

Looks okay so far


--- a/drivers/scsi/scsi_lib.c	2007-10-18 09:35:28.000000000 -0400
+++ b/drivers/scsi/scsi_lib.c	2007-10-18 09:46:47.000000000 -0400
@@ -295,7 +295,7 @@
	int i, err, nr_vecs = 0;

	for_each_sg(sgl, sg, nsegs, i) {
-		page = sg->page;
+		page = sg_page(sg);
		off = sg->offset;
		len = sg->length;
 		data_len += len;
@@ -764,6 +764,8 @@
		if (unlikely(!sgl))
			goto enomem;

+		sg_init_table(sgl, sgp->size);
+
		/*
		 * first loop through, set initial index and return value
		 */
@@ -779,6 +781,13 @@
			sg_chain(prev, SCSI_MAX_SG_SEGMENTS, sgl);

		/*
+		 * if we have nothing left, mark the last segment as
+		 * end-of-list
+		 */
+		if (!left)
+			sg_mark_end(sgl, this);
+
+		/*
		 * don't allow subsequent mempool allocs to sleep, it would
		 * violate the mempool principle.
		 */
@@ -2351,7 +2360,7 @@
	*offset = *offset - len_complete + sg->offset;

	/* Assumption: contiguous pages can be accessed as "page + i" */
-	page = nth_page(sg->page, (*offset >> PAGE_SHIFT));
+	page = nth_page(sg_page(sg), (*offset >> PAGE_SHIFT));
	*offset &= ~PAGE_MASK;

	/* Bytes in this sg-entry from *offset to the end of the page */
-
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