Date: Fri, 31 Jan 2014 15:43:43 -0800 (PST)
From: dormando <dormando@rydia.net>
To: David Rientjes <rientjes@google.com>
cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>,
        Eric Dumazet <eric.dumazet@gmail.com>, netdev@vger.kernel.org,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Alexei Starovoitov <ast@plumgrid.com>
Subject: Re: kmem_cache_alloc panic in 3.10+
In-Reply-To: <alpine.DEB.2.02.1401311521170.18890@chino.kir.corp.google.com>
Message-ID: <alpine.DEB.2.02.1401311537290.17834@dtop>
References: <alpine.DEB.2.10.1401180036020.18419@dinf> <1390062576.31367.519.camel@edumazet-glaptop2.roam.corp.google.com> <alpine.DEB.2.02.1401181101220.579@dtop> <alpine.DEB.2.02.1401292301070.5905@dtop> <1391134615.28432.83.camel@edumazet-glaptop2.roam.corp.google.com>
 <CAADnVQ+vCikFY-te2U8wD+ustNW-o6Cqs8ye5ZfyNcU6vPQzNA@mail.gmail.com> <alpine.DEB.2.10.1401301951060.5516@dinf> <alpine.DEB.2.02.1401311315110.27318@chino.kir.corp.google.com> <alpine.DEB.2.02.1401311407190.17834@dtop>
 <alpine.DEB.2.02.1401311521170.18890@chino.kir.corp.google.com>
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On Fri, 31 Jan 2014, David Rientjes wrote:

> 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.
>

chpxchg_double()? that's not related to the 62713c4b fix right?

I'll see what I can do.. it's going to take a long time to iterate on this
though.

Thanks for the suggestions!
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