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

[Alexei Starovoitov]

On Wed, Jul 30, 2014 at 3:51 PM, David Rientjes <rientjes@xxxxxxxxxx> 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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