linux-kernel - Re: 4.0.0-rc4: panic in free

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Message-ID: <550CBDB8.1090501@oracle.com>
Date:	Fri, 20 Mar 2015 18:39:20 -0600
From:	David Ahern <david.ahern@...cle.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 4.0.0-rc4: panic in free_block

On 3/20/15 6:34 PM, David Rientjes wrote:
> On Fri, 20 Mar 2015, David Ahern wrote:
>
>> Here's another data point: If I disable NUMA I don't see the problem.
>> Performance drops, but no NULL pointer splats which would have been panics.
>>
>> The 128 cpu ldom with NUMA enabled shows the problem every single time I do a
>> kernel compile (-j 128). With NUMA disabled I have done 3 allyesconfig
>> compiles without hitting the problem. I'll put the compiles into a loop while
>> I head out for dinner.
>>
>
> It might be helpful to enable CONFIG_DEBUG_SLAB if you're reproducing it.
>

I enabled that and a few other DEBUG configs earlier -- nothing popped 
out. I'll do it again -- and others when I return.
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