linux-kernel - Re: 2.6.18.5 usb/sysfs bug.

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Date:	Sat, 16 Dec 2006 09:18:28 -0500
From:	Dave Jones <davej@...hat.com>
To:	Chuck Ebbert <76306.1226@...puserve.com>
Cc:	Greg KH <greg@...ah.com>, linux-kernel@...r.kernel.org
Subject: Re: 2.6.18.5 usb/sysfs bug.

On Sat, Dec 16, 2006 at 12:47:09AM -0500, Chuck Ebbert wrote:
 > In-Reply-To: <20061215213715.GB15792@...hat.com>
 > 
 > On Fri, 15 Dec 2006 16:37:15 -0500, Dave Jones wrote:
 > 
 > > > Can you enable CONFIG_USB_DEBUG and send the log info that happens right
 > > > before this oops?
 > >
 > > Gah, and here it is, actually attached this time.
 > 
 > > BUG: unable to handle kernel NULL pointer dereference at virtual address 0000000b
 > 
 > > EIP is at sysfs_hash_and_remove+0x18/0xfd
 > 
 > That's strange.  Remove_files called sysfs_hash_and_remove()
 > with dir==0xfffffff3 (-13 decimal.)

Hmm, That's -EACCESS.  Something not checking a return code at a lower
level maybe ?

 > What is pcscd?

Some smart card daemon iirc.

 > Earlier in bootup you got this:
 > 
 > hub 1-0:1.0: state 7 ports 2 chg 0000 evt 0004
 > uhci_hcd 0000:00:1d.0: port 2 portsc 008a,00
 > hub 1-0:1.0: port 2, status 0100, change 0003, 12 Mb/s
 > usb 1-2: USB disconnect, address 2
 > usb 1-2: usb_disable_device nuking all URBs
 > uhci_hcd 0000:00:1d.0: shutdown urb f7ed7540 pipe 40408280 ep1in-intr
 > usb 1-2: unregistering interface 1-2:1.0
 >  usbdev1.2_ep81: ep_device_release called for usbdev1.2_ep81
 > usb 1-2:1.0: uevent
 > usb 1-2: unregistering device
 >  usbdev1.2_ep00: ep_device_release called for usbdev1.2_ep00
 > 
 > usb_remove_ep_files() is in the call trace, so this may be related?

It's odd that something disconnects during boot, as nothing gets plugged.

		Dave

-- 
http://www.codemonkey.org.uk
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