On Tue, Jan 31, 2012 at 6:14 PM, Johan Hovold <jhovold@xxxxxxxxx> wrote: > On Tue, Jan 31, 2012 at 5:40 PM, Ross Ryles <rossryles@xxxxxxxxxxxxxx> wrote: >> On Tue, Jan 31, 2012 at 3:58 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: >>>> The one thing I can think is common between everything that hangs is >>>> they are using a "tty" of some sort. >>> >>> Yeah, that's probably the reason. >> >> Could it be that "the big tty mutex" is getting held forever by something? > > Yes, I think you cracked it. > > The big tty mutex is taken in tty_release and it effectively prevents > any logins while close is running. In your particular case it may > faulty hardware which is causing close to never return... You should still be able to use a previously opened tty (ssh, screen, X) to grab the USB debug info for your host controller during the lock-up, though. Johan -- 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
