Bug 5887

Summary:	Erratic messages for a CDROM reader/writer
Product:	SCSI Drivers	Reporter:	JP Pozzi (jp.pozzi)
Component:	sym53c8xx	Assignee:	Matthew Wilcox (matthew)
Status:	CLOSED UNREPRODUCIBLE
Severity:	normal	CC:	akpm
Priority:	P2
Hardware:	i386
OS:	Linux
Kernel Version:	2.6.14	Subsystem:
Regression:	---	Bisected commit-id:

Description JP Pozzi 2006-01-13 14:37:55 UTC

Most recent kernel where this bug did not occur:2.6.14 last and 2.6.15
Distribution:Debian
Hardware Environment:AMD MP
Software Environment:Debian
Problem Description:

I get messages every 2 seconds when my CD reader/writer has no Disk :
... Make sure there is a disk in the drive

and other messages when a CD is in the drive :

... sr 2:0:2:0: phase change 2-3 12@.....

also every 2 seconds.

In either case the unit was not mounted, I had to revert to an older kernel
version I think 2.6.14 (.4 ?) as the console is unusable with so many
messages.

The message is since the last 2.6.14 and I get the same messages
with the 2.6.15 (last from Debian I suppose it is 2.6.15-2).

Steps to reproduce: ????

Comment 1 Andrew Morton 2006-01-13 14:56:50 UTC

Does everything otherwise work OK?

If so, should we just nuke that printk, or give it a suitable facility level?

Comment 2 Matthew Wilcox 2006-04-20 06:40:02 UTC

That printk tells us that something moderately nasty is going on on the scsi
bus, so I think it has the appropriate facility level.  I'd like a lot more
detail in this bug report, such as:

 - lspci output
 - lsscsi output
 - At what point in 2.6.15 development did this start happening?
 - Has this stopped happening with the 2.6.17-rc2?

I don't know if this is a sym2 bug or whether it's something the rest of the
stack is doing to perturb this poor device.

Comment 3 JP Pozzi 2006-04-20 11:57:53 UTC

Hello,

The erratic message was only present in 2.6.14, I never see it with the last
2.6.14 and never see it since (I run now 2.6.16-8).

Regards

JP Pozzi