On Wed, 24 Aug 2016, Mathias Nyman wrote: > > >> Reference counting is supposed to keep everything important from being > >> deallocated until all the releases are finished. In particular, if the > >> hcd structure was already deallocated when usb_put_hcd() was called > >> then there is a refcounting bug somewhere. > > > > That seems like a possible cause, I'll look into the refcouting. > > > > This helps a lot. I was getting stuck with that bug. > > Thanks > > Just to update on this, > It appears to be caused by the same address and bandwidth mutex free bug that you > already fixed in ab2a4bf USB: don't free bandwidth_mutex too early Yeah, that's the commit which resets the peer->primary_hcd pointer when a shared hcd is released. > The sleep() worked as it delayed freeing the primary hcd, changing the > order to first release usb3 hcd and then usb2 hcd. Does this mean that the patch you already posted is the proper fix? 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
