[v4.12-rc1 regression] mount ext4 fs results in kernel crash on PPC64le host

[Eryu Guan]

On Thu, Jun 29, 2017 at 08:27:11PM +1000, Michael Ellerman wrote:
> Eryu Guan <eguan at redhat.com> writes:
> 
> > Hi all,
> >
> > Li Wang and I are constantly seeing ppc64le hosts crashing due to bad
> > page access. But it's not reproducing on every ppc64le host we've
> > tested, but it usually happened in filesystem testings.
> 
> <snip>
> 
> > And I've confirmed that reverting above commit 'resolves' the crash.
> 
> Do you mean ~v4.12-rc7 with that commit reverted still triggers the
> crash?

Correct. I also confirmed that reverting it when it was HEAD also fixed
the crash.

Thanks,
Eryu