linux-kernel - 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

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Message-ID: <alpine.LFD.2.00.0911122153320.24119@localhost.localdomain>
Date:	Thu, 12 Nov 2009 21:55:50 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Oleg Nesterov <oleg@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	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>
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 Thu, 12 Nov 2009, Rafael J. Wysocki wrote:

> On Thursday 12 November 2009, Thomas Gleixner wrote:
> > On Wed, 11 Nov 2009, Oleg Nesterov wrote:
> > > Well, yes. Because any buggy user can easily kill the system, and we
> > > constantly have the bugs like this one.
> > > 
> > > I think we should teach workqueue.c to use debugobjects.c at least.
> > 
> > Here you go. Would be interesting to know whether it catches the
> > problem at hand.
> 
> How would I tell if it did?

Apply the patch, enable debugobjects and try to reproduce the failure
- w/o the fix patch of course :)

debugobjects should catch the attempt to free the memory which holds
the work_struct, cancel it and print a backtrace where this happened.

Thanks,

	tglx
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