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SubjectRe: net/bluetooth: workqueue destruction WARNING in hci_unregister_dev
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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