linux-kernel - Re: [BUG] object: is not initialized, yet kobject

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Message-ID: <alpine.LNX.2.00.1009211653510.26813@pobox.suse.cz>
Date:	Tue, 21 Sep 2010 16:55:11 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Heinz Diehl <htd@...cy-poultry.org>
Cc:	Alan Ott <alan@...nal11.us>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-input@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: Re: [BUG] object: is not initialized, yet kobject_put() is being
 called

On Mon, 20 Sep 2010, Heinz Diehl wrote:

> > > >>Could please those of you, who are able to reproduce the problem, verify
> > > >>whether the patch below (completely untested) makes everything behave
> > > >>again? Thanks.
>  
> > > >Yes, everything behaves again. Thanks Jiri.
>   
> > > Seconded. Works good. Thanks for your support Jiri.
>  
> > Thirded! This fixes the warning here.
> 
> Unfortunately, I have to take up this problem a second time. 
> I considered the issue fixed, and in fact it was using Jiris patch.
> 
> However, the same problem came back while testing 2.6.36-rc4 and the
> following -git's. /var/log/warn shows the same warning as mentioned in
> the first mail in this thread:
> 
>  Sep 20 08:18:42 liesel apcupsd[5436]: apcupsd FATAL ERROR in linux-usb.c at line 609 
>  Cannot find UPS device -- For a link to detailed USB trouble
>  shooting information, please see <http://www.apcupsd.com/support.html>.
>  Sep 20 08:18:42 liesel apcupsd[5436]: apcupsd error shutdown completed
> 
> No additional oops this time, only the warning, and my UPS is no longer
> working.
> 
> Jiris patch obviously didn't made it into 2.6.36-rc4, and it doesn't
> apply nay longer either.

This seems like a completely different problem -- apcupsd is not finding 
the UPS, yes, but kernel doesn't WARN/BUG here, so it seems like similar 
symptoms, but very likely a different cause.

Could you perhaps strace apcupsd to see what it is doing before it fails?

-- 
Jiri Kosina
SUSE Labs, Novell Inc.
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