linux-kernel - Re: RFC: Reproducible oops with lockdep on count_matching

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Message-Id: <200711051403.39479.mb@bu3sch.de>
Date:	Mon, 5 Nov 2007 14:03:38 +0100
From:	Michael Buesch <mb@...sch.de>
To:	"Pekka Enberg" <penberg@...helsinki.fi>
Cc:	"Peter Zijlstra" <peterz@...radead.org>,
	"Luis R. Rodriguez" <mcgrof@...il.com>,
	"Michael Wu" <flamingice@...rmilk.net>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	"John W. Linville" <linville@...driver.com>,
	"Ingo Molnar" <mingo@...hat.com>,
	"Johannes Berg" <johannes@...solutions.net>,
	linux-kernel@...r.kernel.org, "Michael Chan" <mchan@...adcom.com>,
	netdev@...r.kernel.org, "Christoph Lameter" <clameter@....com>
Subject: Re: RFC: Reproducible oops with lockdep on count_matching_names()

On Monday 05 November 2007 13:23:50 Pekka Enberg wrote:
> Hi Michael,
> 
> On Sat, 2007-11-03 at 21:06 +0100, Michael Buesch wrote:
> > Who is responsible for slab btw?
> > I mean, someone should be interested in getting this bug fixed. :)
> > When using slab I see random corruptions. I think related to rmmod, but
> > I'm not sure. I don't see this with slub.
> 
> Is CONFIG_DEBUG_SLAB enabled? Usually these kind of random corruptions
> are caused by someone passing a bad pointer to kfree() or
> kmem_cache_free().

Yeah.

What I also saw was random "one-bit-errors" once and then on rmmod of modules.
I have absolutely no idea how they were caused, though (I read the freeing
codes of the stuff hundreds of times). I don't have any of the oops messages
anymore.
But I do _not_ see this behaviour with slub anymore.

-- 
Greetings Michael.
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