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From: David Brownell <david-b@pacbell.net>
To: Andrew Morton <akpm@linux-foundation.org>
Subject: Re: 2.6.20-mm2
Date: Sun, 18 Feb 2007 21:13:03 -0800
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Cc: "Rafael J. Wysocki" <rjw@sisk.pl>, linux-kernel@vger.kernel.org
References: <20070217215146.30e7ffa3.akpm@linux-foundation.org> <200702190032.09052.rjw@sisk.pl> <20070218162822.3fd10212.akpm@linux-foundation.org>
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On Sunday 18 February 2007 4:28 pm, Andrew Morton wrote:
> On Mon, 19 Feb 2007 00:32:08 +0100 "Rafael J. Wysocki" <rjw@sisk.pl> wrote:
> 

> > One more thing:
> > 
> > rtc_cmos 00:02: rtc core: registered rtc_cmos as rtc0
> > Unable to handle kernel NULL pointer dereference at 0000000000000030 RIP: 
> >  [<ffffffff804032c3>] rtc_sysfs_remove_device+0x23/0x50
> > 	...
> > Call Trace:
> >  [<ffffffff803c5786>] class_device_del+0x86/0x180
> >  [<ffffffff803c5891>] class_device_unregister+0x11/0x20
> >  [<ffffffff8040280e>] rtc_device_unregister+0x3e/0x50
> >  [<ffffffff880cd789>] :rtc_cmos:cmos_pnp_probe+0x219/0x240
> >  [<ffffffff803988a1>] pnp_device_probe+0xa1/0xe0
> >  ...
> 
> How did you provoke that?  modprobe rtc-cmos?

Plus, I'd guess, the old rtc driver statically linked.

What I see is a should-not-happen fault of some kind in a cleanup
path that's been tested with non-PNP rtc drivers.  A quick glance
at the code left me puzzled.  Would sleeping a second or two before
calling rtc_device_unregister() change that behavior?

- Dave
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