linux-kernel - Re: [BUG 3.12.rc4] Oops: unable to handle kernel paging request during shutdown

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Date:	Fri, 25 Oct 2013 12:23:49 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	Knut Petersen <Knut_Petersen@...nline.de>,
	Ingo Molnar <mingo@...nel.org>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Greg KH <greg@...ah.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [BUG 3.12.rc4] Oops: unable to handle kernel paging request
 during shutdown

On Fri, 25 Oct 2013, Linus Torvalds wrote:

> On Mon, Oct 14, 2013 at 6:53 PM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
> >
> > And your other oopses do seem to have a similar pattern, even if their
> > actual oops is elsewhere. They oops in run_timer_softirq, also taking
> > a page fault in the 0xf9...... range, so it might well be a vmalloc
> > address there too.
> 
> Hmm.. I just got a run_timer_softirq oops on my own laptop, slightly
> different. That was not during shutdown, although there was a "yum
> upgrade" finishing when that happened, so it's quite likely that there
> was a service shutdown (and then restart).
> 
> I think it's related. But my oops has almost no information: the IP
> that was jumped to was bogus, and the callchain is just CPU idle
> followed by the softirq -> run_timers_softirq handling, so there's no
> real way to see *what* triggered it.
> 
> The bad rip was ffffffffa051e250, which is not a valid code address.
> It *might* be a module address, though. So this might be triggered by
> rmmod on some module that doesn't remove all its timers...
> 
> Ideas?

Enable DEBUG_OBJECTS, DEBUG_OBJECTS_FREE, DEBUG_OBJECTS_TIMERS

That should give you an accurate hint what site is not cleaning up
proper.

Thanks,

	tglx
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