linux-kernel - Re: i915_driver_irq_handler - BUG: NULL pointer dereference

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Date:	Wed, 22 Jul 2009 15:03:30 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	John Kacur <jkacur@...hat.com>
cc:	rt-users <linux-rt-users@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Clark Williams <williams@...hat.com>,
	Dave Airlie <airlied@...ux.ie>
Subject: Re: i915_driver_irq_handler - BUG: NULL pointer dereference



On Wed, 22 Jul 2009, John Kacur wrote:

> Hello Thomas et al
> 
> I'm still seeing this sometimes, in this case during shutdown with the experimental rt kernel
> based off of 2.6.31-rc3
> 
> The system is going down for reboot NOW!
> Disabling monthly Smolt update: [  OK  ]
> Shutting down Avahi daemon: [drm:gm45_get_vblank_counter] *ERROR* trying to get1
> BUG: unable to handle kernel NULL pointer dereference at 0000000000000084
> IP: [<ffffffffa05df8ef>] i915_driver_irq_handler+0x848/0x8e9 [i915]

So it crashes in the i915 interrupt handler. Smells like a
synchronization problem on shutdown which is exposed by the threaded
handler.

Dave, any idea ?

Thanks,

	tglx
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