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

[Fengguang Wu]

On Wed, Jul 30, 2014 at 04:00:58PM -0700, Alexei Starovoitov wrote:
> 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

Alexei, I've been using gcc 4.8.2 for 4 months.

Maybe it's because I test new randconfigs every day. And the problem
may only show up with very specific kernel config?

Thanks,
Fengguang

> > 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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