linux-kernel - Re: 2.6.20-mm2

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Date:	Tue, 20 Feb 2007 23:07:44 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	David Brownell <david-b@...bell.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.20-mm2

On Monday, 19 February 2007 06:13, David Brownell wrote:
> On Sunday 18 February 2007 4:28 pm, Andrew Morton wrote:
> > On Mon, 19 Feb 2007 00:32:08 +0100 "Rafael J. Wysocki" <rjw@...k.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.

Yes (mistakenly).

> 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?

[tries]

No.

Greetings,
Rafael
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