Re: [syzbot] [mm?] WARNING in deferred_split_folio

David Hildenbrand (Arm)
2026-04-01T11:38:37Z

On 4/1/26 13:34, Lance Yang wrote:
>
> On Wed, Apr 01, 2026 at 01:22:58PM +0200, David Hildenbrand (Arm) wrote:
>> On 4/1/26 13:20, Lance Yang wrote:
>>>
>>>
>>> Ouch, you're right, I was wrong - the trylock drop is a pre-existing
>>> issue, not caused by the reorder ;)
>>>
>>>
>>> Nice, LGTM!
>>>
>>> Given that the "trylock -> drop" behavior seems to exist already today,
>>> do you think it's worth fixing that together with the reorder?
>>
>> I'd do it in a single shot if possible.
>
> ACK.
>
>> Can you craft something? (cc stable etc)
>
> certainly, will do! But commit[1] ("mm: migrate: requeue destination
> folio on deferred split queue") is only in mm-stable now, not yet
> upstream/stable ...

It's tricky. The original commit will be backported to stable kernels,
so we want also the fix to be backported to the same stable kernels.

The commit id in mm-stable is "stable" now.

--
Cheers,

David