Re: 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