linux-kernel - Re: slub/debugobjects: lockup when freeing memory

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Message-ID: <alpine.DEB.2.11.1406191519090.4002@gentwo.org>
Date:	Thu, 19 Jun 2014 15:19:39 -0500 (CDT)
From:	Christoph Lameter <cl@...two.org>
To:	Thomas Gleixner <tglx@...utronix.de>
cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Jones <davej@...hat.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: slub/debugobjects: lockup when freeing memory

On Thu, 19 Jun 2014, Thomas Gleixner wrote:

> Well, no. Look at the callchain:
>
> __call_rcu
>     debug_object_activate
>        rcuhead_fixup_activate
>           debug_object_init
>               kmem_cache_alloc
>
> So call rcu activates the object, but the object has no reference in
> the debug objects code so the fixup code is called which inits the
> object and allocates a reference ....

So we need to init the object in the page struct before the __call_rcu?

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