netdev - Re: Oops/Warning report for the week of March 28th 2008

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Message-Id: <1206742499.22530.90.camel@johannes.berg>
Date:	Fri, 28 Mar 2008 23:14:59 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Arjan van de Ven <arjan@...ux.intel.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	NetDev <netdev@...r.kernel.org>, Dmitry Torokhov <dtor@...l.ru>
Subject: Re: Oops/Warning report for the week of March 28th 2008

> Ahh. So it's easily repeatable for you.. Do you think you could bisect it? 
> At least a few runs? Even a partial bisection will give a nice (== much 
> smaller) range of commits to be blamed, and might tell us why it started 
> happening..

Unfortunately, it takes forever on this machine to compile a kernel
after any bigger changes. I can do it early next week when I have access
to my bigger box again.

On the other hand, it should be easily reproducible by anyone else with
the same trick, here's what I do:

 * configure X to use /dev/input/event* devices
 * in an xterm, do something like
      rmmod usbhid ; modprobe usbhid
 * switch to a VT
 * watch kernel crash as X releases the grab on the event device

Mind you, I actually did this with the appletouch driver, but I don't
think it makes a difference since the problematic thing is the code that
X grabs the device. A trivial program that executes the grab ioctl would
probably suffice if you leave it running over a rmmod/modprobe cycle.

johannes

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