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

[Ingo Molnar]

* Thomas Gleixner <tglx@xxxxxxxxxxxxx> 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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