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Date:   Tue, 13 Sep 2016 11:35:20 -0400
From:   Tejun Heo <>
To:     Dmitry Vyukov <>
Cc:     Jiri Slaby <>, Marcel Holtmann <>,
        Gustavo Padovan <>,
        Johan Hedberg <>,
        "David S. Miller" <>,
        linux-bluetooth <>,
        netdev <>,
        LKML <>,
        syzkaller <>,
        Kostya Serebryany <>,
        Alexander Potapenko <>,
        Eric Dumazet <>,
        Takashi Iwai <>
Subject: Re: net/bluetooth: workqueue destruction WARNING in


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?



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