linux-kernel - Re: BUG: unable to handle kernel paging request in usb_match

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Message-ID: <20120805165826.GB13913@kroah.com>
Date:	Sun, 5 Aug 2012 09:58:26 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Oliver Neukum <oneukum@...e.de>,
	Bjørn Mork <bjorn@...k.no>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	linux-kernel@...r.kernel.org,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: BUG: unable to handle kernel paging request in usb_match_id()

On Sun, Aug 05, 2012 at 10:59:38AM +0800, Fengguang Wu wrote:
> Hi all,
> 
> This line triggers an oops in kvm boot test:
> 
> usb_match_id():
> ==>      748         for (; id->idVendor || id->idProduct || id->bDeviceClass ||
>          749                id->bInterfaceClass || id->driver_info; id++) {
>          750                 if (usb_match_one_id(interface, id))
>          751                         return id;
>          752         }
> 
> It's an old bug and happens also in linux 3.0. It's very reproducible
> for the attached config. I can send the initrd (yocto-minimal-i386.cgz)
> on your request in private email.

Odds are a driver without a terminating NULL for the device id list is
causing this to fail.

What devices are in the system and what drivers are trying to be bound?

greg k-h
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