linux-kernel - Re: 31-rc3-mmotm0716 - dead USB trackball mouse kills entire system

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Message-ID: <Pine.LNX.4.44L0.0907281031020.2881-100000@iolanthe.rowland.org>
Date:	Tue, 28 Jul 2009 10:33:46 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Valdis.Kletnieks@...edu
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Jiri Kosina <jkosina@...e.cz>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	<linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>
Subject: Re: 31-rc3-mmotm0716 - dead USB trackball mouse kills entire system

On Mon, 27 Jul 2009 Valdis.Kletnieks@...edu wrote:

> Confirming - the patch in that thread prevents the system lockup I was
> seeing.
> 
> So it looks like hid_reset() getting more chatty sometime in the last 2 weeks
> was a red herring, and one I can't actually complain about - it was quite
> legitimately whinging about not being able to reset a device that was in fact
> dead in the water at the time.  Given that, and a working patch for ehci-hcd.c,
> I'm having a hard time finding the enthusiasm to track down what exactly
> changed in hid-core.c. :)
> 
> The change in hid-core.c behavior just had the bad luck to land in -mmotm at
> the exact same time the bug in ehci-hcd.c landed.  So we had two user-visible
> behavior changes in the same area of code at the same time.  Hilarity ensues. :)
> 
> Thanks for pointing me at the actual fix. ;)

A question for you: Do you now observe any warnings in the dmesg log if
you rmmod ehci-hcd after the trackball mouse is gone?  Apparently the 
patch you tested isn't perfect and some stuff gets leaked.  I'm trying 
to track down the problem.

Alan Stern

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