New: Domain validation failures on aic7xxx

Apparently a regression.

(I thought the plan was to make [email protected] auto-forward stuff to linux-scsi?)

Begin forwarded message:

Date: Tue, 6 Jun 2006 08:53:16 -0700
From: [email protected]
To: [email protected]
Subject: [Bugme-new] [Bug 6657] New: Domain validation failures on aic7xxx

http://bugzilla.kernel.org/show_bug.cgi?id=6657

Summary: Domain validation failures on aic7xxx
Kernel Version: 2.6.16
Status: NEW
Severity: high
Owner: [email protected]
Submitter: [email protected]

Most recent kernel where this bug did not occur: 2.6.10
Distribution: Gentoo
Hardware Environment: x86, AHA19160, WD18310 Software Environment:
Problem Description:

In 2.6.14 and 2.6.16 I get domain validation errors on my WD18310 connected to a 19160, causing it to drop back to asynchronous rather than 40 or 80MHz wide.

Domain validation reports parity errors, write buffer failures, performs resets and generally stuffs around for a few minutes before deciding it will allow async.

I have 2 other discs (Seagate SX118202LS) attached to the same chain which still work. My scsi system works perfectly in 2.6.10 with no data corruption.

I have a very similar issue with a dual SYM53C896 in a different machine: it works in 2.6.10 but produces occasional noise in dmesg:
sym0:9:0:phase change 6-7 11@17cd5f84 resid=6.
On newer (>= 2.6.14) kernels, it completely fails to boot, giving the same sort of parity errors I'm having with the aic7xxx driver. When I checked at the time (a while ago now), there was NO change in the relevant driver between kernel versions. The only changes are to the scsi architecture.

This leads me to believe the bug is not in the aic7xxx driver but the new scsi domain validation code that was overhauled somewhere around 2.6.13-14.

Some of my error messages look a lot like those in #5268.

Steps to reproduce: Use kernel >=2.6.14 with aic7892 or 53C896.

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You are on the CC list for the bug, or are watching someone who is.

It is ... let me go and give mbligh a swift kick [administered by this email] to see if I can get him to move on this.

I'd say that's pretty conclusive. The theory being that the WD doesn't have a functional echo buffer, or it lies about the size and in either case we get errors back not because of a syndrome test failure but because of a problem in the WD echo buffer.

Try this patch for diagnosis only ... what it's doing is disabling the echo buffer tests globally. If everything boots up OK (please send dmesg output so I can see what the echo buffer length is), then we get to try to figure out if the WD can do any echo buffer tests or if it has to be globally blacklisted (not fun ... LVD really shouldn't be configured without the echo buffer test of the transmission line).

James

index 780aaed..88bb4ff 100644
@@ -859,7 +859,9 @@ spi_dv_device_internal(struct scsi_devic
 	if (len == -1 && spi_dt(starget))
 		len = spi_dv_device_get_echo_buffer(sdev, buffer);
 
-	if (len <= 0) {
+	starget_printk(KERN_INFO, starget, "Echo buffer length %d\n", len);
+
+	if (1) {
 		starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");
 		return;
 	}

It's not going to auto-forward, otherwise every update to bugs owned by the virtual alias will come through. What I was planning was to cc linux-scsi on emails to bugme-new (ie one email per new bug only) for that category only. I'll try to get that going this morning ...

M.

Yes ... that's what we want. An email that can be replied to and will go to the submitter and linux-scsi and be captured by bugzilla.

Thanks,

James

OK, set up. It should reply to bugme-daemon, which should result up being back in the DB ... all emails should be tagged with [bugme-new] in them, so its easy to filter if need be.

I cc'ed IO/storage-SCSI, and all the SCSI drivers ones. If that's not correct, or you have other problems with it, let me know.

Hitting reply-all may result in mail to bugme-new as well as bugme-daemon ... a mild pain, but should get caught by the list filtration, so no big deal, I think.

M.

Hi,

I've applied your patch and rebuilt the kernel but it'll be a few days before I can try it since the machine in question is Very Busy(tm) right now.

thanks.

Stoned koala bears drooled eucalyptus spit in awe as James Bottomley

William Brodie-Tyrrell

Carpe Diem - fish of the day.

<[email protected]>
http://www.brodie-tyrrell.org/