linux-kernel - Re: [BUG] NULL pointer deref with rcutorture

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Message-ID: <20090107201904.GA32513@alice>
Date:	Wed, 7 Jan 2009 21:19:04 +0100
From:	Eric Sesterhenn <snakebyte@....de>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, josh@...edesktop.org,
	dipankar@...ibm.com
Subject: Re: [BUG] NULL pointer deref with rcutorture

* Paul E. McKenney (paulmck@...ux.vnet.ibm.com) wrote:
> On Tue, Jan 06, 2009 at 04:48:09AM -0800, Paul E. McKenney wrote:
> > On Tue, Jan 06, 2009 at 08:47:07AM +0100, Eric Sesterhenn wrote:
> > > * Paul E. McKenney (paulmck@...ux.vnet.ibm.com) wrote:
> > > > On Mon, Jan 05, 2009 at 04:29:12PM -0800, Paul E. McKenney wrote:
> > > > > On Mon, Jan 05, 2009 at 02:18:36PM -0800, Paul E. McKenney wrote:
> > > > > I will see what I can find from this.
> > > > 
> > > > Hello, Eric,
> > > > 
> > > > Just for grins, I built the 2.6.28 kernel/rcutorture.c on b58602a.  It
> > > > insmoded and rmmoded without errors.
> > > > 
> > > > Could you please try this on your setup?  I have attached this file in
> > > > case that helps.
> > > 
> > > works like a charm
> > 
> > Well, that certainly tells me where the bug lies.  ;-)
> > 
> > Thank you for all your hard work on this, I should have a patch soon.
> 
> And here it is, against the original version of rcutorture.c (revert
> all of my previous patches against rcutorture.c).  I am also attaching
> the resulting rcutorture.c, if that makes things more convenient for you.
> 
> Could you please fire this up and see if it fixes the rmmod-time bug
> that you located?

it does fix the bug, thanks for your work

Greetings, Eric
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