Re: net/bluetooth: workqueue destruction WARNING in hci_unregister_dev

From	Jiri Slaby <jslaby@suse.cz>
Newsgroups	linux.kernel
Subject	Re: net/bluetooth: workqueue destruction WARNING in hci_unregister_dev
Date	2016-02-19 13:20 +0100
Message-ID	<r3Scp-4Z3-3@gated-at.bofh.it> (permalink)
References	<qVarU-3A1-17@gated-at.bofh.it> <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>
Organization	linux.* mail to news gateway

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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

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Re: net/bluetooth: workqueue destruction WARNING in  hci_unregister_dev Jiri Slaby <jslaby@suse.cz> - 2016-02-18 15:10 +0100
  Re: net/bluetooth: workqueue destruction WARNING in hci_unregister_dev Dmitry Vyukov <dvyukov@google.com> - 2016-02-18 15:30 +0100
    Re: net/bluetooth: workqueue destruction WARNING in  hci_unregister_dev Tejun Heo <tj@kernel.org> - 2016-02-18 18:50 +0100
      Re: net/bluetooth: workqueue destruction WARNING in  hci_unregister_dev Jiri Slaby <jslaby@suse.cz> - 2016-02-19 11:30 +0100
        Re: net/bluetooth: workqueue destruction WARNING in  hci_unregister_dev Jiri Slaby <jslaby@suse.cz> - 2016-02-19 13:20 +0100

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