linux-kernel - Re: [PATCH] mm/hmm: Fix bad subpage pointer in try_to_unmap

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Message-ID: <05fffcad-cf5e-8f0c-f0c7-6ffbd2b10c2e@nvidia.com>
Date:   Tue, 9 Jul 2019 18:24:57 -0700
From:   Ralph Campbell <rcampbell@...dia.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        Jérôme Glisse <jglisse@...hat.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Mike Kravetz <mike.kravetz@...cle.com>
Subject: Re: [PATCH] mm/hmm: Fix bad subpage pointer in try_to_unmap_one


On 7/9/19 5:28 PM, Andrew Morton wrote:
> On Tue, 9 Jul 2019 15:35:56 -0700 Ralph Campbell <rcampbell@...dia.com> 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?
> 

Yes. Can you add this or should I send a v2?