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

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Date:	Wed, 23 May 2007 15:32:37 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Srihari Vijayaraghavan <sriharivijayaraghavan@...oo.com.au>
cc:	Hugh Dickins <hugh@...itas.com>, Ingo Molnar <mingo@...e.hu>,
	Oliver Xymoron <oxymoron@...te.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PROBLEM] 2.6.22-rc2 panics on x86-64 with slub

On Thu, 24 May 2007, Srihari Vijayaraghavan wrote:

> I'm stunned. Honestly, I have no possible explanations for this behaviour. Do
> you? I need more time to work out (until otherwise you might know a reason).

Hmmm... Bad. We have conflicting reports and no clear way to trigger the 
bug. This may actually only trigger depending on how certain objects is 
place in memory.

Could you boot with slub_debug and then run

slabinfo -v

to validate all slabs? If there is anything wrong with an object then it 
should show in the syslog.

slabinfo.c can be found at Documentation/vm/slabinfo.c

> Oh, while at it, I created this patch (to ask you more info on what
> slub_nomerge is for):

See Documentation/vm/slub.txt which covers most of those.

slub_nomerge is not mentioned. It removes an optimization and that is only 
useful for debugging strange cornercases. I hope to remove it someday.

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