linux-kernel - Re: kmem_cache_alloc panic in 3.10+

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Message-ID: <alpine.DEB.2.02.1401311521170.18890@chino.kir.corp.google.com>
Date:	Fri, 31 Jan 2014 15:22:10 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	dormando <dormando@...ia.net>
cc:	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Alexei Starovoitov <ast@...mgrid.com>
Subject: Re: kmem_cache_alloc panic in 3.10+

On Fri, 31 Jan 2014, dormando wrote:

> > CONFIG_SLUB_DEBUG_ON will definitely be slower but can help to identify
> > any possible corruption issues.
> >
> > I'm wondering if you have CONFIG_MEMCG enabled and are actually allocating
> > slab in a non-root memcg?  What does /proc/self/cgroup say?
> >
> 
> /proc/self/cgroup is empty on these hosts. CONFIG_MEMCG is enabled though.
> 

It _looks_ like the cmpxchg_double() so seeing if there is anything else 
funny going on with CONFIG_SLUB_DEBUG_ON would definitely be helpful; 
otherwise, try using CONFIG_SLAB is Eric suggested and seeing if the 
problem goes away.
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