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Date: Wed, 30 Jul 2014 15:51:12 -0700 (PDT)
From: David Rientjes <rientjes@google.com>
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To: Christoph Hellwig <hch@infradead.org>
cc: Fengguang Wu <fengguang.wu@intel.com>, Al Viro <viro@zeniv.linux.org.uk>,
        Jet Chen <jet.chen@intel.com>, Su Tao <tao.su@intel.com>,
        Yuanhan Liu <yuanhan.liu@intel.com>, LKP <lkp@01.org>,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [delayed_fput] BUG: unable to handle kernel paging request at
 ffff8800122a0ad0
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On Wed, 30 Jul 2014, Christoph Hellwig wrote:

> On Wed, Jul 30, 2014 at 11:55:41AM +0800, Fengguang Wu wrote:
> > Greetings,
> > 
> > 0day kernel testing robot got the below dmesg and the first bad commit is
> 
> How does this manage to trip over a 2 year old commit now?
> 

I think there's something weird going on with the testing of CONFIG_SLOB, 
same as http://permalink.gmane.org/gmane.linux.kernel/1759314 that 
identified a harmless commit that only initializes a field of
struct mm_struct and then ended up exploded in slob freeing.