On Sat, 16 Oct 2010, Stefan Richter wrote: > Alan Stern wrote: > > On Thu, 14 Oct 2010, Stefan Richter wrote: > > > >> Alan Stern wrote: > >>> Stefan, is it possible for you to tell whether this really does work? > >> That will be hard. So far I was unable to reproduce the oops; still running > >> unmodified 2.6.36-rc7. > > > > Was this on an SMP machine? > > Yes. > > > If yes, the untested patch below may help > > trigger the oops. To use it, insert (but don't mount) a memory card > > into the card reader, and use dd to copy a large amount of data from > > the card to /dev/null. While that's running, unplug either the monitor > > or the card reader. You may want to do this at a VT console so you can > > see directly when the delay occurs. > > > > Alan Stern > > > > > > > > Index: usb-2.6/drivers/usb/core/message.c > > =================================================================== > > --- usb-2.6.orig/drivers/usb/core/message.c > > +++ usb-2.6/drivers/usb/core/message.c > > @@ -323,8 +323,13 @@ static void sg_complete(struct urb *urb) > > /* on the last completion, signal usb_sg_wait() */ > > io->bytes += urb->actual_length; > > io->count--; > > - if (!io->count) > > + if (!io->count) { > > + if (status == -ECONNRESET) { > > + printk(KERN_ERR "Delaying for test\n"); > > + mdelay(600); > > + } > > complete(&io->complete); > > + } > > > > spin_unlock(&io->lock); > > } > > > > I did so today on 2.6.36-rc8, without your other patch. I was still unable to > reproduce the bug. Forget the whole thing as unreproducible? What I said above wasn't quite right. This won't help trigger the oops, but it should trigger the line saying something like ehci_hcd 0000:00:12.2: qh ffff880208f07af0 (#00) state 5 That's the real bug. 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