[CRIU] More uffd related questions (Error (page-read.c:128): Missing 7fff408d8000 in parent pagemap)

[Pavel Emelyanov]

>> This is mm.img part, while page-read engine deals with pagemap-xxx.img files where
>> triplets of [start len in_parent] sit.
> 
> Ah, okay. This is my error. The page I am trying to copy does indeed not
> exist in the pagemap:
> 
>         {
>             "vaddr": "0x7f8025f6e000", 
>             "nr_pages": 5
>         }, 
>         {
>             "vaddr": "0x7fff408d9000", 
>             "nr_pages": 3
>         }, 
>         {
>             "vaddr": "0x7fff409c2000", 
>             "nr_pages": 2
>         }
> 
> So to decide which pages I have to copy I only have to look at the content
> of pagemap-xxx.img and not mm.img, right? Good to know.

Yes, the pagemap.img describes the physical memory dumped into the image files.

-- Pavel