linux-kernel - Re: [delayed_fput] BUG: unable to handle kernel paging request at ffff8800122a0ad0

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Message-ID: <CAADnVQ+OwgG-RJQ7QwfW2qrvpV9XYySckTbNmcacW7K0KxQqvA@mail.gmail.com>
Date:	Wed, 30 Jul 2014 16:00:58 -0700
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Jet Chen <jet.chen@...el.com>, Su Tao <tao.su@...el.com>,
	Yuanhan Liu <yuanhan.liu@...el.com>, LKP <lkp@...org>,
	linux-fsdevel@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [delayed_fput] BUG: unable to handle kernel paging request at ffff8800122a0ad0

On Wed, Jul 30, 2014 at 3:51 PM, David Rientjes <rientjes@...gle.com> wrote:
> 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?

may be because all kernels are built with gcc 4.8.2 ?
Fengguang, did you recently switch to new compiler?
I think all older builds were with 4.6.3

> 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.
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