linux-kernel - Re: [linux-usb-devel] [2.6.22-rc7] khubd NULL deref oops...

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Message-ID: <20070712093027.6258d80d@gondolin.boeblingen.de.ibm.com>
Date:	Thu, 12 Jul 2007 09:30:27 +0200
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Daniel J Blueman <daniel.blueman@...il.com>,
	Chuck Ebbert <cebbert@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	USB development list <linux-usb-devel@...ts.sourceforge.net>
Subject: Re: [linux-usb-devel] [2.6.22-rc7] khubd NULL deref oops...

On Wed, 11 Jul 2007 17:41:13 -0400 (EDT),
Alan Stern <stern@...land.harvard.edu> wrote:

> On Wed, 11 Jul 2007, Daniel J Blueman wrote:
> 
> > > Try disabling CONFIG_USB_SUSPEND.  It makes lots of USB bugs go away
> > 
> > I'll give it a shot. For the record, I wasn't trying to perform a
> > suspend at this time (or since booting).
> 
> I doubt that USB suspend has any connection with this problem.  It's
> clear that the problem occurs in the driver core when the SCSI core
> tries to unregister a device.  It's not directly related to USB at all.

Hm, it seems that the class device's kobject is not set up correctly
(at least, not its name) when make_class_name() is called. Might be
that it is unregistered before it has been added completely (at least,
before kobject_set_name() has been called).

> 
> In fact, it looks like the bug is connected with 
> CONFIG_SYSFS_DEPRECATED.  You can try to see what happens with that 
> switch disabled.

Turning on verbose driver core messages (CONFIG_DEBUG_DRIVER) while
leaving on CONFIG_SYSFS_DEPRECATED may also be worthwile.
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