linux-kernel - Re: [PROBLEM] 2.6.22-rc2 panics on x86-64 with slub

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Message-ID: <20070522070738.GI4705@kernel.dk>
Date:	Tue, 22 May 2007 09:07:39 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Christoph Lameter <clameter@....com>
Cc:	Ingo Molnar <mingo@...e.hu>, Hugh Dickins <hugh@...itas.com>,
	Srihari Vijayaraghavan <sriharivijayaraghavan@...oo.com.au>,
	Oliver Xymoron <oxymoron@...te.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PROBLEM] 2.6.22-rc2 panics on x86-64 with slub

On Mon, May 21 2007, Christoph Lameter wrote:
> Ok booting SLUB without "slub_debug" and having
> 
> CONFIG_DEBUG_LOCK_ALLOC
> CONFIG_LOCKDEP
> 
> will trigger the problem.
> 
> So I guess the issue is that lockdep does a slab alloc while we get the 
> slab lock during slab alloc?

If I have CONFIG_SLUB_DEBUG set, then box boots fine. If I don't have it
set, then it hard hangs sometime after boot:

[...]
ReiserFS: sda2: Using r5 hash to sort names
VFS: Mounted root (reiserfs filesystem) readonly.
Freeing unused kernel memory: 180k freed

which is usually followed by messages bringing up the network link, etc.
Let me know which tests you want run, or which patches to try.

-- 
Jens Axboe

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