linux-kernel - Re: netfilter: active obj WARN when cleaning up

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Message-ID: <20131127133231.GO16735@n2100.arm.linux.org.uk>
Date:	Wed, 27 Nov 2013 13:32:31 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Pablo Neira Ayuso <pablo@...filter.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	Patrick McHardy <kaber@...sh.net>, kadlec@...ckhole.kfki.hu,
	"David S. Miller" <davem@...emloft.net>,
	netfilter-devel@...r.kernel.org, coreteam@...filter.org,
	netdev@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Greg KH <greg@...ah.com>
Subject: Re: netfilter: active obj WARN when cleaning up

On Wed, Nov 27, 2013 at 02:29:41PM +0100, Thomas Gleixner wrote:
> Though the kobject is the only thing which has a delayed work embedded
> inside struct kmem_cache. And the debug object splat points at the
> kmem_cache_free() of the struct kmem_cache itself. That's why I
> assumed the wreckage around that place. And indeed:
> 
> kmem_cache_destroy(s)
>     __kmem_cache_shutdown(s)
>       sysfs_slab_remove(s)
>         ....
> 	kobject_put(&s->kobj)
>            kref_put(&kobj->kref, kobject_release);
> 	     kobject_release(kref)
>     	       #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
> 	         schedule_delayed_work(&kobj->release)
> 	       #else
> 	        kobject_cleanup(kobj)
> 	       #endif
> 
> So in the CONFIG_DEBUG_KOBJECT_RELEASE=y case, schedule_delayed_work()
> _IS_ called which arms the timer. debugobjects catches the attempt to
> free struct kmem_cache which contains the armed timer.

You fail to show where the free is in the above path.
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