Re: [PATCH] mm: mglru: fix stale batch updates after memcg reparenting

[Qi Zheng]

On 6/23/26 10:15 AM, Barry Song wrote:
> On Tue, Jun 23, 2026 at 9:58 AM Qi Zheng <qi.zheng@xxxxxxxxx> wrote:
> >

[...]

> > > > WARNING: mm/vmscan.c:5867 at lru_gen_exit_memcg+0x26f/0x300
> > > > RIP: 0010:lru_gen_exit_memcg+0x26f/0x300 mm/vmscan.c:5867
> > >
> > > I can't find 5867; instead, I can find 5828:
> > >
> > > VM_WARN_ON_ONCE(memchr_inv(lruvec->lrugen.nr_pages, 0,
> > >     sizeof(lruvec->lrugen.nr_pages)));
> > >
> > > Is this the warning?
> >
> > Yes, I just copy-pasted the warning log from Peiyang's report.
> >
> > Maybe the description should be changed to:
> >
> > This will trigger the following warning in lru_gen_exit_memcg():
> >
> >          VM_WARN_ON_ONCE(memchr_inv(lruvec->lrugen.nr_pages, 0,
> >                                             sizeof(lruvec->lrugen.nr_pages)));
> >
> > >
>
> Yep. Can we update the v2 changelog accordingly?

Sure, will do in v2.

Thanks,
Qi

> Best Regards
> Barry