linux-kernel - Re: net/bluetooth: workqueue destruction WARNING in hci_unregister

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Message-ID: <56C70618.3010902@suse.cz>
Date:	Fri, 19 Feb 2016 13:10:00 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	Tejun Heo <tj@...nel.org>, Dmitry Vyukov <dvyukov@...gle.com>
Cc:	Marcel Holtmann <marcel@...tmann.org>,
	Gustavo Padovan <gustavo@...ovan.org>,
	Johan Hedberg <johan.hedberg@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-bluetooth@...r.kernel.org, netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	syzkaller <syzkaller@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Takashi Iwai <tiwai@...e.com>
Subject: Re: net/bluetooth: workqueue destruction WARNING in
 hci_unregister_dev

On 02/19/2016, 11:20 AM, Jiri Slaby wrote:
> On 02/18/2016, 06:44 PM, Tejun Heo wrote:
>> Hello,
>>
>> Can you please do the followings?
>>
>> 1. Remove WQ_MEM_RECLAIM from the affected workqueue and see whether
>>    the problem is reproducible.  WQ_MEM_RECLAIM on anything bluetooth
>>    doesn't make sense btw.  Why is it there?
>>
>> 2. If WQ_MEM_RECLAIM makes the issue go away, see whether the attached
>>    patch works too.
> 
> Hello,
> 
> 1. didn't help, the problem persists. So I haven't applied the patch from 2.

FWIW I dumped more info about the wq:
wq->name='hci0' pwq=ffff8800390d7600 wq->dfl_pwq=ffff8800390d5200
pwq->refcnt=2 pwq->nr_active=0 delayed_works: <nothing>

> thanks,
-- 
js
suse labs