Re: net/bluetooth: workqueue destruction WARNING in hci_unregister_dev

From	Tejun Heo <tj@kernel.org>
Newsgroups	linux.kernel
Subject	Re: net/bluetooth: workqueue destruction WARNING in hci_unregister_dev
Date	2016-03-02 16:50 +0100
Message-ID	<r8hcf-1c4-37@gated-at.bofh.it> (permalink)
References	(1 earlier) <r3xrm-6Oj-31@gated-at.bofh.it> <r3xKG-6WT-11@gated-at.bofh.it> <r3ASf-CA-23@gated-at.bofh.it> <r3QtY-3Bd-15@gated-at.bofh.it> <r3Scp-4Z3-3@gated-at.bofh.it>
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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

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Re: net/bluetooth: workqueue destruction WARNING in  hci_unregister_dev Tejun Heo <tj@kernel.org> - 2016-03-02 16:50 +0100
  Re: net/bluetooth: workqueue destruction WARNING in  hci_unregister_dev Jiri Slaby <jslaby@suse.cz> - 2016-03-03 10:20 +0100

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