Re: Kernel panic during boot in usb_add_task

[Michael Neumann <mneumann@xxxxxxxx>]

Matthew Dillon wrote:
> :http://opengrok.creo.hu/dragonfly/xref/src/sys/bus/usb/usb.c#374
> :
> :More specifically:
> :
> :   http://opengrok.creo.hu/dragonfly/xref/src/sys/sys/queue.h#428
> :
> :   *(head)->tqh_last = (elm);
> :
> :This expands to:
> :
> :   *(&taskq->tasks)->tgh_last = task;
> :
> :There a NULL pointer is dereferenced somehow.
>
>      It looks like memory corruption.  USB may be issuing duplicate TAILQ
>      operations on its taskq structure(s).
>
>      Please try this patch.  If it doesn't work then one or more task
>      structure is probably being ripped out from under the usb code,
>      probably by somthing related to uhci_timeout() as you previously
>      reported.  My guess is that uhci_detach() is ripping the structure
>      out without waiting for the abort to finish but lets see if this
>      patch has any effect first.
>
> 						-Matt

No, your patch doesn't work. Thanks anyway!

Regards,

  Michael