On Mon, 7 Sep 2009, Manish Katiyar wrote:
> Hi,
>
> while resuming my laptop after a suspend, I see the following in my
> dmesg. My kernel is running 2.6.31-rc7 . I am not subscribed to the
> list, so please cc me while replying.
>
>
> [ 1968.716951] Restarting tasks ...
> [ 1968.717893] BUG: unable to handle kernel NULL pointer dereference at 00000002
> [ 1968.717905] IP: [<f866bbb3>] hub_thread+0x233/0x2260 [usbcore]
> With my limited knowledge I tried debugging above oops .... and think
> that line 3138 in usb/core/hub.c is problematic. The corresponding
> offending assembly is :-
>
> 11496 .L674:
> 11497 .loc 1 3138 0
> 11498 movl -160(%ebp), %edx # hub,
> 11499 movl 76(%edx), %eax # <variable>.descriptor,
> <variable>.descriptor
> 11500 leal 64(%edx), %ecx #,
> 11501 movl %ecx, -180(%ebp) #,
> 11502 cmpb $0, 2(%eax) # <variable>.bNbrPorts
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
>
>
> 3136
> 3137 /* deal with port status changes */
> 3138 for (i = 1; i <= hub->descriptor->bNbrPorts; i++)
> {
Could be. Please rebuild your kernel with CONFIG_USB_DEBUG enabled and
post the dmesg log showing a complete boot-up, suspend, and resume
(including the oops). That will tell us more about what's going on.
Alan Stern
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
