linux-kernel - Re: 2.6.32.2 - WARNING: at lib/kref.c:43 kref

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Message-ID: <4B84D2EA.4090209@krogh.cc>
Date:	Wed, 24 Feb 2010 08:19:06 +0100
From:	Jesper Krogh <jesper@...gh.cc>
To:	"J. Bruce Fields" 
	<public-bfields-uC3wQj2KruNg9hUCZPvPmw@...ne.gmane.org>
CC:	Nikola Ciprich 
	<public-extmaillist-Jp3n8lUXroTtwjQa/ONI9g@...ne.gmane.org>,
	Harry Edmon 
	<public-harry-qmPYOCrcNLLyFCzt5hm0YvZ8FUJU4vz8@...ne.gmane.org>,
	Andrew Morton 
	<public-akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@...ne.gmane.org>,
	public-linux-kernel-u79uwXL29TY76Z2rM5mHXA@...ne.gmane.org,
	public-linux-nfs-u79uwXL29TY76Z2rM5mHXA@...ne.gmane.org,
	public-nikola.ciprich-Jp3n8lUXroTtwjQa/ONI9g@...ne.gmane.org
Subject: Re: 2.6.32.2 - WARNING: at lib/kref.c:43 kref_get+0x,23/0x2b()




J. Bruce Fields wrote:
> On Wed, Feb 17, 2010 at 04:14:35PM +0100, Nikola Ciprich wrote:
>> Well,
>> I did a lot of stress tests, and it seems to be pretty random, and what's
>> worse, I think it is more then one problem, oh great...
>> Seems that at least one of my NFS problems was in fact caused by ext4 regression
>> (what FS are you using?)
>> applying this one: http://bugzilla.kernel.org/attachment.cgi?id=24975
>> improved things for me a lot (see http://bugzilla.kernel.org/show_bug.cgi?id=15231 for
>> full discussion).
>> I'll watch the machine for next few days and report...
> 
> Is there *any* kernel (however old) on which you are confident you can
> *not* reproduce the kref bug?

I have got a bug that looks a lot like this on 2.6.32.8 yesterday less 
than 24 hours after booting the first 2.6.32 kernel but we have been 
running on 2.6.31 for 3 months before, so I'm fairly confident that it 
is a .31 -> .32 regression.

http://lkml.org/lkml/2010/2/23/70

Jesper
-- 
Jesper



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