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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 2016-09-13 17:40 +0200
Message-ID <sgXYt-3KE-3@gated-at.bofh.it> (permalink)
References (5 earlier) <rftLl-4o3-21@gated-at.bofh.it> <sdgZI-4ni-35@gated-at.bofh.it> <se1OW-4aR-35@gated-at.bofh.it> <se1YC-4eB-7@gated-at.bofh.it> <sfMVs-6Un-23@gated-at.bofh.it>
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Hello,

On Sat, Sep 10, 2016 at 11:33:48AM +0200, Dmitry Vyukov wrote:
> Hit the WARNING with the patch. It showed "Showing busy workqueues and
> worker pools:" after the WARNING, but then no queue info. Was it
> already destroyed and removed from the list?...

Hmm...  It either means that the work item which was in flight when
WARN_ON() ran finished by the time the debug printout got to it or
that it's something unrelated to busy work items.

> [ 198.113838] WARNING: CPU: 2 PID: 26691 at kernel/workqueue.c:4042
> destroy_workqueue+0x17b/0x630

I don't seem to have the same source code that you have.  Which exact
WARN_ON() is this?

Thanks.

-- 
tejun

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Thread

Re: net/bluetooth: workqueue destruction WARNING in hci_unregister_dev Dmitry Vyukov <dvyukov@google.com> - 2016-09-10 11:40 +0200
  Re: net/bluetooth: workqueue destruction WARNING in  hci_unregister_dev Tejun Heo <tj@kernel.org> - 2016-09-13 17:40 +0200
    Re: net/bluetooth: workqueue destruction WARNING in  hci_unregister_dev Jiri Slaby <jslaby@suse.cz> - 2016-09-13 20:20 +0200
      Re: net/bluetooth: workqueue destruction WARNING in  hci_unregister_dev Tejun Heo <tj@kernel.org> - 2016-09-16 22:30 +0200

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