linux-kernel - Re: 2.6.26-rc9-git12: Reported regressions from 2.6.25

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Date:	Mon, 14 Jul 2008 11:57:33 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Johannes Berg <johannes@...solutions.net>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Adrian Bunk <bunk@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Natalie Protasevich <protasnb@...il.com>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Greg KH <greg@...ah.com>
Subject: Re: 2.6.26-rc9-git12: Reported regressions from 2.6.25

On Mon, 14 Jul 2008, Johannes Berg wrote:

> > > > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=11072
> > > > Subject		: scsi-layer crash after usb storage device unplug
> > > > Submitter	: Johannes Berg <johannes@...solutions.net>
> > > > Date		: 2008-07-12 01:50 (2 days old)
> > > > Handled-By	: Alan Stern <stern@...land.harvard.edu>
> > > > Patch		: http://bugzilla.kernel.org/show_bug.cgi?id=11072#c3
> > > 
> > > Alan, Greg?
> > 
> > We haven't heard back yet from Johannes to confirm that the fix really
> > works.  If it does, IMO the patch should go into 2.6.26.1.
> > 
> > (In fact it might not be so easy to tell, since the failure is caused 
> > be a race.  Perhaps it would be best to submit the patch in any case.)
> 
> I haven't had a chance to apply the patch, but given that to cause the
> oops to happen I had to unplug/replug the device at random intervals for
> probably 10 minutes (yes, it took me that long to figure out I had put
> an SDHC card into an SD reader) I suppose it really won't be easy to
> tell.

Add

	printk(KERN_ALERT "Unplug now!\n");
	ssleep(10);

to the start of slave_configure() in drivers/usb/storage/scsiglue.c.  
Then it should be very easy to trigger the failure.  :-)

Assuming the failure does occur without the patch, see if it still 
occurs once the patch is in place.

Alan Stern

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