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Date:	Wed, 11 Nov 2009 21:24:33 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mike Galbraith <efault@....de>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Greg KH <gregkh@...e.de>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Tejun Heo <tj@...nel.org>,
	Marcel Holtmann <marcel@...tmann.org>,
	linux-bluetooth@...r.kernel.org, Oliver Neukum <oliver@...kum.org>
Subject: Re: GPF in run_workqueue()/list_del_init(cwq->worklist.next) on
	resume (was: Re: Help needed: Resume problems in 2.6.32-rc, perhaps
	related to preempt_count leakage in keventd)

On 11/11, Rafael J. Wysocki wrote:
>
> On Wednesday 11 November 2009, Oleg Nesterov wrote:
> >
> > Rafael, could you reproduce the problem with the debugging patch below?
> > It tries to detect the case when the pending work was corrupted and
> > prints its work->func (saved in the previous item). It should work
> > if the work_struct was freed and poisoned, or if it was re-initialized.
> > See ck_work().
>
> I applied the patch and this is the result of 'dmesg | grep ERR' after 10-or-so
> consecutive suspend-resume and hibernate-resume cycles:
>
> [  129.008689] ERR!! btusb_waker+0x0/0x27 [btusb]
> [  166.477373] ERR!! btusb_waker+0x0/0x27 [btusb]
> [  203.983665] ERR!! btusb_waker+0x0/0x27 [btusb]
> [  241.636547] ERR!! btusb_waker+0x0/0x27 [btusb]
>
> which kind of confirms my previous observation that the problem was not
> reproducible without Bluetooth.

Great, thanks.

> So, it looks like the bug is in btusb_destruct(), which should call
> cancel_work_sync() on data->waker before freeing 'data'.  I guess it should
> do the same for data->work.

Or. btusb_suspend() and btusb_close() do cancel_work_sync(data->work),
perhaps they should cancel data->waker as well, I dunno.

I added Oliver to cc.

Oleg.

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