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From: Markus Trippelsdorf <markus@trippelsdorf.de>
Subject: Re: [RFC/RFT PATCH] sched: automated per tty task groups
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Date: Wed, 20 Oct 2010 15:55:25 +0200
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Mike Galbraith wrote:

> Comments, suggestions etc highly welcome.

I've tested your patch and it runs smoothly on my machine.
However I had several NULL pointer dereference BUGs that happened when I 
left X or rebooted my system. I think this is caused by your patch. 
There is nothing in the logs unfortunately, but I scribbled down the 
following by hand (not the whole trace, I'm too lazy):

BUG: unable to handle NULL pointer dereference at 0..038
IP:   pick_next_task_fair 0xa7/0x1a0
...
Call Trace: schedule 
...