linux-kernel - Re: [GIT PULL] SLAB changes for v2.6.39-rc1

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Date:	Thu, 24 Mar 2011 21:03:24 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Christoph Lameter <cl@...ux.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	tj@...nel.org, npiggin@...nel.dk, rientjes@...gle.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [GIT PULL] SLAB changes for v2.6.39-rc1

On Thu, Mar 24, 2011 at 8:59 PM, Ingo Molnar <mingo@...e.hu> wrote:
>
> * Pekka Enberg <penberg@...nel.org> wrote:
>
>> On Thu, Mar 24, 2011 at 8:47 PM, Christoph Lameter <cl@...ux.com> wrote:
>> >
>> > On Thu, 24 Mar 2011, Eric Dumazet wrote:
>> >
>> >> > this_cpu_cmpxchg16b_emu:
>> >> >         pushf
>> >> >         cli
>> >> >
>> >> >         cmpq %gs:(%rsi), %rax
>> >
>> >> Random guess
>> >>
>> >> Masking interrupts, and accessing vmalloc() based memory for the first
>> >> time ?
>> >
>> > Hmmm.. Could be. KVM would not really disable interrupts so this may
>> > explain that the test case works here.
>> >
>> > Simple fix would be to do a load before the cli I guess.
>>
>> Btw, I tried Ingo's .config and it doesn't boot here so it's somehow
>> .config related.
>
> did you get a similar early crash as i? I'd not expect my .config to have all
> the drivers that are needed on your box.

It hanged here which is pretty much expected on this box if
kmem_cache_init() oopses. I'm now trying to see if I'm able to find
the config option that breaks things. CONFIG_PREEMPT_NONE is a
suspect:

penberg@...er:~/linux$ grep PREEMPT ../config-ingo
# CONFIG_PREEMPT_RCU is not set
CONFIG_PREEMPT_NONE=y
# CONFIG_PREEMPT_VOLUNTARY is not set
# CONFIG_PREEMPT is not set
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