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

[Lance Yang]

On 2026/4/1 19:38, David Hildenbrand (Arm) wrote:
> 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.

Emm... Not a big deal, I guess. We can always submit a stable backport 
once that fix gets merged into stable :D