[6.4.0-rc7-next-20230620] Boot failure on IBM Power LPAR

[Sachin Sant]

>> The problem was introduced in 6.4.0-rc7-next-20230619. I tried git bisect, but unsure of the
>> result reported by it. Bisect points to following patch
>> 
>> # git bisect bad
>> 70c94cc2eefd4f98d222834cbe7512804977c2d4 is the first bad commit
>> commit 70c94cc2eefd4f98d222834cbe7512804977c2d4
>> Merge: 48f5ee5c48c3 3fe08f7d5e80
>> Author: Stephen Rothwell <sfr at canb.auug.org.au>
>> Date:   Tue Jun 20 09:43:25 2023 +1000
>> 
>>    Merge branch 'mm-everything' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
>>         # Conflicts:
>>         #       mm/mmap.c
> 
> Usually bisect pointing to a merge means something has gone wrong with
> the bisect. It's not impossible for a merge to be the cause of a bug,
> but IME it's rare.
> 

I have tried the bisect 3 times and the result was same. It always
points to this merge commit.

Is there anything else I can try to help debug this issue?

-Sachin