linux-kernel - Re: PROBLEM: Oops when using dm-crypt with dpt

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Date:	Fri, 3 Aug 2007 13:52:39 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Philipp Tölke <philipptoelke@....de>
Cc:	linux-kernel@...r.kernel.org, dm-devel@...hat.com,
	Christophe Saout <christophe@...ut.de>,
	Alasdair G Kergon <agk@...hat.com>
Subject: Re: PROBLEM: Oops when using dm-crypt with dpt_i2o

On Fri, 03 Aug 2007 22:46:14 +0200
Philipp T__lke <philipptoelke@....de> wrote:

> Hi Andrew, hi everybody!
> 
> Thanks for the reply!
> 
> Andrew Morton wrote:
> >> The oopses:
> >>
> >> #v+
> >> BUG: unable to handle kernel paging request at virtual address 14001000
> >> [...]
> > 
> > So it looks like q->request_fn points at 0x14001000, which is in outer
> > space.
> > 
> > I wonder how that could happen, in the middle of heavy IO operations. 
> > Possibly a memory scribble.  I'd suggest you enable CONFIG_SLAB,
> > CONFIG_DEBUG_SLAB, CONFIG_DEBUG_PAGEALLOC.
> 
> That doesn't change anything, apart from adding a line "DEBUG_PAGEALLOC"
> to the oopses.

drat.

> Do I have to enable the debugging manually? After a quick
> grep over the sources and a google-session I think not but I'm no
> kernel-hacker.

No, just enable it.

> > You could also try switching
> > from CONFIG_SLAB to CONFIG_SLUB, then enable CONFIG_SLUB_DEBUG.
> 
> Unfortunately the only change seems to be, that the Keyboard-Leds don't
> flash after the crash. Everything else is the same.

drat.

> Could a hardware-error cause this?

It sounds unlikely.  One wouldn't expect it to crash in the same way each
time.


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