Re: [PATCH] mm/hmm: Fix bad subpage pointer in try_to_unmap_one

[Andrew Morton]

On Tue, 9 Jul 2019 15:35:56 -0700 Ralph Campbell <rcampbell@xxxxxxxxxx> wrote:

> When migrating a ZONE device private page from device memory to system
> memory, the subpage pointer is initialized from a swap pte which computes
> an invalid page pointer. A kernel panic results such as:
> 
> BUG: unable to handle page fault for address: ffffea1fffffffc8
> 
> Initialize subpage correctly before calling page_remove_rmap().

I think this is

Fixes:  a5430dda8a3a1c ("mm/migrate: support un-addressable ZONE_DEVICE page in migration")
Cc: stable

yes?