linux-kernel - Re: [block IO crash] Re: 2.6.39-rc5-git2 boot crashs

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Message-ID: <20110504101932.GA3392@elte.hu>
Date:	Wed, 4 May 2011 12:19:32 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jens Axboe <axboe@...nel.dk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	werner <w.landgraf@...ru>, "H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [block IO crash] Re: 2.6.39-rc5-git2 boot crashs


* Thomas Gleixner <tglx@...utronix.de> wrote:

> But I rather suspect, that CONFIG_SLUB=y is the thing we need to look at. The 
> lockless fastpath cmpxchg comes to my mind.

Hm, and CONFIG_X86_ELAN, as Linus noted, has an impact on the cmpxchg 
implementation.

> Either we generate broken code with that ELAN caused options or that combo 
> triggers some hidden problem in SLUB.

Note that the crash went away with SLUB_DEBUG=y and PAGEALLOC=y and 
SLUB_DEBUG=y would certainly narrow any lockless-SLUB race windows.

Thanks,

	Ingo
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