On Sun, Aug 05, 2012 at 09:58:26AM -0700, Greg KH wrote:
> 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?
The last match is for: drivers/usb/misc/emi62.c
Located down by Tianyu's debug patch:
[ 2.206708] usb_device_match: device 1-1:1.0, driver cytherm
[ 2.207627] usb_device_match: device 1-1:1.0, driver emi62 - firmware loader
[ 2.208769] BUG: unable to handle kernel paging request at c1f7478e
[ 2.209726] IP: [<c14ac1c0>] usb_match_id+0x5b/0xcd
> --- a/drivers/usb/core/driver.c
> +++ b/drivers/usb/core/driver.c
> @@ -778,7 +778,8 @@ static int usb_device_match(struct device *dev, struct device_driver *drv)
>
> intf = to_usb_interface(dev);
> usb_drv = to_usb_driver(drv);
> -
> +
> + pr_info("%s: device %s, driver %s \n", dev_name(dev), drv->name);
> id = usb_match_id(intf, usb_drv->id_table);
> if (id)
> return 1;
Thanks,
Fengguang
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