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

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Date:	Wed, 27 Nov 2013 00:07:09 +0100
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	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>
Subject: Re: netfilter: active obj WARN when cleaning up

On Tue, Nov 26, 2013 at 02:11:57PM -0500, Sasha Levin wrote:
> Ping? I still see this warning.

Did your test include patch 0c3c6c00c6?

> On 09/07/2013 09:10 AM, Sasha Levin wrote:
> >Hi all,
> >
> >While fuzzing with trinity inside a KVM tools guest, running latest -next kernel, I've
> >stumbled on the following:
> >
> >[  418.311956] ------------[ cut here ]------------
> >[  418.312449] WARNING: CPU: 6 PID: 4178 at lib/debugobjects.c:260 debug_print_object+0x8d/0xb0()
> >[  418.313243] ODEBUG: free active (active state 0) object type: timer_list hint:
> >delayed_work_timer_fn+0x0/0x20
> >[  418.314038] Modules linked in:
> >[  418.314038] CPU: 6 PID: 4178 Comm: kworker/u16:2 Tainted: G        W 3.11.0-next-20130906-sasha
> >#3984
> >[  418.314038] Workqueue: netns cleanup_net
> >[  418.314038]  0000000000000104 ffff880410371a58 ffffffff841b7815 0000000000000104
> >[  418.314038]  ffff880410371aa8 ffff880410371a98 ffffffff8112540c ffff880410371a78
> >[  418.314038]  ffffffff853ea0ab ffff8800bdc68b80 ffffffff85a65c00 ffffffff87676658
> >[  418.314038] Call Trace:
> >[  418.314038]  [<ffffffff841b7815>] dump_stack+0x52/0x87
> >[  418.320315]  [<ffffffff8112540c>] warn_slowpath_common+0x8c/0xc0
> >[  418.321040]  [<ffffffff811254f6>] warn_slowpath_fmt+0x46/0x50
> >[  418.321101]  [<ffffffff81a60ded>] debug_print_object+0x8d/0xb0
> >[  418.321101]  [<ffffffff811444e0>] ? __queue_work+0x390/0x390
> >[  418.321101]  [<ffffffff81a61605>] __debug_check_no_obj_freed+0xa5/0x220
> >[  418.321101]  [<ffffffff81249e76>] ? kmem_cache_destroy+0x86/0xe0
> >[  418.321101]  [<ffffffff81a61795>] debug_check_no_obj_freed+0x15/0x20
> >[  418.321101]  [<ffffffff812874d7>] kmem_cache_free+0x197/0x340
> >[  418.321101]  [<ffffffff81249e76>] kmem_cache_destroy+0x86/0xe0
> >[  418.321101]  [<ffffffff83d5d681>] nf_conntrack_cleanup_net_list+0x131/0x170
> >[  418.321101]  [<ffffffff83d5ec5d>] nf_conntrack_pernet_exit+0x5d/0x70
> >[  418.321101]  [<ffffffff83cda1ce>] ops_exit_list+0x5e/0x70
> >[  418.321101]  [<ffffffff83cda80b>] cleanup_net+0xfb/0x1c0
> >[  418.321101]  [<ffffffff81145c28>] process_one_work+0x338/0x550
> >[  418.321101]  [<ffffffff81145b50>] ? process_one_work+0x260/0x550
> >[  418.321883]  [<ffffffff81147605>] worker_thread+0x215/0x350
> >[  418.321883]  [<ffffffff811473f0>] ? manage_workers+0x180/0x180
> >[  418.321883]  [<ffffffff81150887>] kthread+0xe7/0xf0
> >[  418.321883]  [<ffffffff811507a0>] ? __init_kthread_worker+0x70/0x70
> >[  418.321883]  [<ffffffff841c7a2c>] ret_from_fork+0x7c/0xb0
> >[  418.321883]  [<ffffffff811507a0>] ? __init_kthread_worker+0x70/0x70
> >[  418.321883] ---[ end trace c974221542b61d0d ]---
> >
> >
> >Thanks,
> >Sasha
> 
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