On Fri, Jul 18, 2003, James Courtier-Dutton <[EMAIL PROTECTED]> wrote:
> See attached file for details.
> Description: Kernel oops when unplugging the usb cable of an active usb
> device.
> It has some explanations of the "uhci.c-oops" attachment, together with
> extract from the source code identifying the oops position, together
> with the ksymoops output from the oops.
>
> Can anyone help?
> The reason I need this fixed is that there are certain audio devices out
> there that disconnect themselves from the usb bus without the user
> knowing, so it is up to the kernel to remove the device from it's tables
> gracefully without oops.
[snip]
> /* Walk the list of pending URB's to see which ones completed */
> spin_lock(&uhci->urb_list_lock);
> head = &uhci->urb_list;
> tmp = head->next;
> while (tmp != head) {
> struct urb *urb = list_entry(tmp, struct urb, urb_list);
>
> /* THIS IS WHERE THE OOPS HAPPENS!!! */
> tmp = tmp->next; /* THIS IS WHERE THE OOPS HAPPENS!!! */
>
> /* Checks the status and does all of the magic necessary */
> uhci_transfer_result(uhci, urb);
> }
> spin_unlock(&uhci->urb_list_lock);
[snip]
> Unable to handle kernel paging request at virtual address 5a5a5a5a
[snip]
Something freed the memory for the URB before it was unlinked.
My first inclination is to point the finger at the ALSA USB audio
driver.
JE
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