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

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Message-ID: <alpine.DEB.2.10.1503201731560.22072@chino.kir.corp.google.com>
Date:	Fri, 20 Mar 2015 17:34:44 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	David Ahern <david.ahern@...cle.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 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.
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