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Date: Wed, 2 Mar 2016 10:45:07 -0500
From: Tejun Heo <tj@kernel.org>
To: Jiri Slaby <jslaby@suse.cz>
Cc: Dmitry Vyukov <dvyukov@google.com>, Marcel Holtmann <marcel@holtmann.org>,
        Gustavo Padovan <gustavo@padovan.org>,
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        Sasha Levin <sasha.levin@oracle.com>,
        Eric Dumazet <edumazet@google.com>, Takashi Iwai <tiwai@suse.com>
Subject: Re: net/bluetooth: workqueue destruction WARNING in
 hci_unregister_dev
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Hello, Jiri.

On Fri, Feb 19, 2016 at 01:10:00PM +0100, Jiri Slaby wrote:
> > 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>

Can you please print out the same info for all pwq's during shutdown?
It looks like we're leaking pwq refcnt but I can't spot a place where
that could happen on an empty pwq.

Thanks.

-- 
tejun