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[Xen-devel] Re: 2.6.39 crashes BUG: unable to handle kernel NULL pointer

To: John Stultz <john.stultz@xxxxxxxxxx>
Subject: [Xen-devel] Re: 2.6.39 crashes BUG: unable to handle kernel NULL pointer dereference at 000000000000042 .. cmos_checkintr+0x4d/0x55 under Xen as PV guest.
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Tue, 22 Mar 2011 10:38:41 -0400
Cc: tglx@xxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
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> > No. 2.6.38 vaniall works great.
> 
> Ok. Hrm. 
> 
> > > Any insight there?
> > 
> > I hoped you might have :-)
> 
> Could you help me understand where in the probe logic xen bombs out of
> the cmos code?

Sure. The issue is that rtc_update_irq calls schedule_work with rtc->irqwork
which has not been initialized. The reason for that is that rtc_device_register
has never been called.. uh wait, that does not make sense, it is called in
cmos_do_probe. Hmm, let get find out exactly on which variable queue_work_on
bombs out on.


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