linux-kernel - Re: "do_IRQ: 0.89 No irq handler for vector (irq -1)"

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Date:	Fri, 8 Oct 2010 09:52:11 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Dave Airlie <airlied@...il.com>
cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: "do_IRQ: 0.89 No irq handler for vector (irq -1)"

On Thu, 7 Oct 2010, Thomas Gleixner wrote:
  Oct  7 23:21:24 ionos kernel: Console: switching to colour VGA+ 80x25
> Oct  7 23:21:31 ionos kernel: drm: unregistered panic notifier
> Oct  7 23:21:31 ionos kernel: vga_switcheroo: disabled
> Oct  7 23:21:31 ionos kernel: [drm:drm_mm_takedown] *ERROR* Memory manager not clean. Delaying takedown
> 
> That one scares me :)
> 
> Oct  7 23:21:32 ionos kernel: BUG: unable to handle kernel paging request at 00000037362e313a
> 
> We are again dereferencing a user space address.

Further debugging shows that the interrupt is torn down and the
vectors are cleared. On modprobe the irq is set up again and a
different vector is assigned.

The interrupt which comes in is going to the old vector. So something
is stale in the card.

Thanks,

	tglx
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