linux-kernel - Re: 2.6.26-rc5: SLUB debug, lockdep warning...

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Message-ID: <6278d2220806141650t520027ccw46d4ee936d101501@mail.gmail.com>
Date:	Sun, 15 Jun 2008 00:50:24 +0100
From:	"Daniel J Blueman" <daniel.blueman@...il.com>
To:	"Vegard Nossum" <vegard.nossum@...il.com>
Cc:	"Christoph Lameter" <clameter@....com>,
	"Linux Kernel" <linux-kernel@...r.kernel.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Pekka Enberg" <penberg@...helsinki.fi>
Subject: Re: 2.6.26-rc5: SLUB debug, lockdep warning...

On Sat, Jun 14, 2008 at 10:23 PM, Vegard Nossum <vegard.nossum@...il.com> wrote:
> On Sat, Jun 14, 2008 at 12:54 PM, Daniel J Blueman
> <daniel.blueman@...il.com> wrote:
>> When enabling lockdep + SLUB debugging, I spotted this recursive
>> lock-acquisition warning [1] when booting, however it doesn't always
>> pop out.
>
> This seems to be the work of
>
> commit 3ac7fe5a4aab409bd5674d0b070bce97f9d20872
> Author: Thomas Gleixner <tglx@...utronix.de>
> Date:   Wed Apr 30 00:55:01 2008 -0700
>
>    infrastructure to debug (dynamic) objects
>
> ...which by the way changed SLUB without any SOBs from any of the SLUB
> maintainers?

> Anyway, adding some Ccs.

Thanks for the detective work Vegard!

>> Let me know if you need further information etc.
>
> Exact kernel version and your config file would be useful (please post
> it online somewhere if possible). Thanks!

2.6.26-rc5 mainline, x86-64 dual-core with maximal debug, running
stock Ubuntu 8.04 desktop, NFSv4 home; seems to trigger always with
nscd loading on boot. Config at:

http://quora.org/slub-lockdep-config
-- 
Daniel J Blueman
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