Re: Crash in MM code in v4.4.y, v4.9.y with TRANSPARENT_HUGEPAGE enabled

[Andi Kleen]

> Plus I'd have expected the problem to have been in mainline too, and
> apparently it's just the 4.4 and 4.9 backports.

There's another problem in 4.17, but not 4.18, see 
https://bugzilla.redhat.com/show_bug.cgi?id=1618792

Could be the same or different.

-Andi

> 
> Your test-case does have mprotect with PROT_NONE. Which together with
> that mask that *might* be PHYSICAL_PMD_PAGE_MASK makes me think it
> might be related.
> 
>              Linus