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

[Michael Ellerman]

Eryu Guan <eguan at redhat.com> writes:

> 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.

OK. The former, reverting it on top of mainline is more informative.

cheers