linux-kernel - Re: [2.6.32-rc3 kmemleak] WARNING: at kernel/lockdep.c:3161check

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Date:	Thu, 8 Oct 2009 21:34:25 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	paulmck@...ux.vnet.ibm.com, catalin.marinas@....com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [2.6.32-rc3 kmemleak] WARNING: at kernel/lockdep.c:3161check_flags+0xbe/0x180()

Hello.

Paul E. McKenney wrote:
> > --- linux-2.6.32-rc3.orig/mm/kmemleak.c
> > +++ linux-2.6.32-rc3/mm/kmemleak.c
> > @@ -833,7 +833,7 @@ static void early_alloc(struct early_log
> >  	 */
> >  	rcu_read_lock();
> >  	object = create_object((unsigned long)log->ptr, log->size,
> > -			       log->min_count, GFP_KERNEL);
> > +			       log->min_count, GFP_ATOMIC);
> 
> Won't we need to check for object==NULL?
> 
> 							Thanx, Paul
> 
> >  	spin_lock_irqsave(&object->lock, flags);
> >  	for (i = 0; i < log->trace_len; i++)
> >  		object->trace[i] = log->trace[i];
> > 

Indeed. We need to check for NULL.

If the stack dump is correct, this error indicates circular function calls.
We need to find the location which triggers circular memory allocation.
Maybe just checking for NULL is not sufficient.
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