kernel BUG at mm/huge_memory.c:2613!

[Roman Gushchin]

Hi!

I was consistently hitting a VM_BUG_ON_PAGE() in split_huge_page_to_list()
when running vanilla 5.8-rc1 on my desktop. It was happening on every boot
during the system start. I haven't seen this issue on 5.7.

It looks like split_huge_page() expects the page to be locked,
but it hasn't been changed from 5.7. I do not see any suspicious
commits around the call side either.

I've tried the following patch:

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