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

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Message-ID: <20100222053741.GE29366@develbox.linuxbox.cz>
Date:	Mon, 22 Feb 2010 06:37:41 +0100
From:	Nikola Ciprich <nikola.ciprich@...uxbox.cz>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	Nikola Ciprich <extmaillist@...uxbox.cz>,
	Harry Edmon <harry@...os.washington.edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org
Subject: Re: 2.6.32.2 - WARNING: at lib/kref.c:43 kref_get+0x,23/0x2b()

It was working pretty well when we were using 2.6.27.x, but after upgrade, I
also changed FS from XFS to ext4, (so I can't easily test with 2.6.27 now) and
since then NFS is almost unusable on this machine.
But 2.6.27 is pretty old, so there's been a lot of changes.
But greg released 2.6.32.9-rc1 which contains bunch of NFS-related fixes,
so I'll give it a try and report.
nik

On Sat, Feb 20, 2010 at 06:51:05PM -0500, 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?
> 
> --b.
> 
> > regards
> > nik
> > 
> > On Tue, Feb 16, 2010 at 03:29:47PM -0500, J. Bruce Fields wrote:
> > > On Tue, Feb 16, 2010 at 09:27:20PM +0100, Nikola Ciprich wrote:
> > > > > Nothing yet.  I'm taking another look.
> > > > > 
> > > > > Do you know what the most recent version was where you did *not* see
> > > > > these warnings?
> > > > well, actually I decided I'll bisect this one no matter what, so hopefully
> > > > we'll see soon :)
> > > > I'll report
> > > 
> > > That would be fantastic, thanks.  What test-case are you using?
> > > 
> > > Any partial information ("xxxx good, xxxx bad") would also be useful.
> > > 
> > > --b.
> > > --
> > > To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
> > > the body of a message to majordomo@...r.kernel.org
> > > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > > 
> > 
> > -- 
> > -------------------------------------
> > Ing. Nikola CIPRICH
> > LinuxBox.cz, s.r.o.
> > 28. rijna 168, 709 01 Ostrava
> > 
> > tel.:   +420 596 603 142
> > fax:    +420 596 621 273
> > mobil:  +420 777 093 799
> > www.linuxbox.cz
> > 
> > mobil servis: +420 737 238 656
> > email servis: servis@...uxbox.cz
> > -------------------------------------
> 

-- 
-------------------------------------
Ing. Nikola CIPRICH
LinuxBox.cz, s.r.o.
28. rijna 168, 709 01 Ostrava

tel.:   +420 596 603 142
fax:    +420 596 621 273
mobil:  +420 777 093 799
www.linuxbox.cz

mobil servis: +420 737 238 656
email servis: servis@...uxbox.cz
-------------------------------------

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