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Date: Fri, 5 Aug 2011 12:01:38 -0500 (CDT)
From: Christoph Lameter <cl@linux.com>
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To: Dave Jones <davej@redhat.com>
cc: Pekka Enberg <penberg@kernel.org>,
        Markus Trippelsdorf <markus@trippelsdorf.de>,
        Linux Kernel <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Jens Axboe <jaxboe@fusionio.com>
Subject: Re: list corruption in the last few days. (block ? crypto ?)
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On Fri, 5 Aug 2011, Dave Jones wrote:

> On Fri, Aug 05, 2011 at 11:47:56AM -0500, Christoph Lameter wrote:
>  > On Fri, 5 Aug 2011, Dave Jones wrote:
>  >
>  > > Not sure if you were addressing my original report (quoted above), or the networking
>  > > related report in this part of the thread. But anyway, I had it turned on (as well as just about
>  > > every other debugging option).  I didn't see anything output from it though,
>  > > just the LIST_DEBUG warnings.
>  >
>  > But CONFIG_SLUB_DEBUG_ON was off? If slab debugging was on then this could
>  > be an issue with full slab list management instead of partial lists.
>
> $ grep SLUB_DEBUG_ON .config
> CONFIG_SLUB_DEBUG_ON=y

Argh another debugging code issue. Anyone who sees this please verify that
it also occurs with debugging off. I ran this code for 9 months in
various configs but only sporadically with debugging support since that
switches the lockless stuff. With the lockless ops on we cannot
establish a stable state of the object as needed for regular inspection
and verification of operations.