kernel BUG at mm/usercopy.c:72!

[Balbir Singh]

> > Kees, depending on how that turns out we may ask you to revert
> > 517e1fbeb65f ("mm/usercopy: Drop extra is_vmalloc_or_module() check").
> 
> That's fine by me. Let me know what you think would be best.
> 
> Laura, I don't see much harm in putting this back in place. It seems
> like it's just a matter of efficiency to have it removed?

It looks like we resolved struct page of 0xd000000003d80030 as PageSlab?

Balbir Singh.