linux-kernel - Re: kmem_cache_alloc panic in 3.10+

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Message-ID: <alpine.DEB.2.02.1401311315110.27318@chino.kir.corp.google.com>
Date:	Fri, 31 Jan 2014 13:19:29 -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 Thu, 30 Jan 2014, dormando wrote:

> > > I really wonder... it looks like a possible in SLUB. (might be already
> > > fixed)
> > >
> > > Could you try using SLAB instead ?
> >
> > try config_slub_debug_on=y ? it should catch double free and other things.
> >
> 
> Any slowdowns/issues with that?

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?
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