Re: 4.19.5 and later has tons of false messages "BUG: non-zero pgtables_bytes on freeing mm: -16384"

[Sasha Levin <sashal@xxxxxxxxxx>]

On Thu, Dec 27, 2018 at 10:28:56AM +0100, Christian Borntraeger wrote:
> On 27.12.2018 10:13, Christian Borntraeger wrote:
> > Martin,
> >
> > Right now you get a message
> > "BUG: non-zero pgtables_bytes on freeing mm: -16384"
> > for EVERY process that exits in 4.19.5 and later.
> >
> > bisect points to
> > commit 4136161d676a93fc8df6bdb80d720c15522d6c24
> > Author: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
> > Date:   Mon Oct 15 11:09:16 2018 +0200
> >
> >     s390/mm: fix mis-accounting of pgtable_bytes
> >
> >     [ Upstream commit e12e4044aede97974f2222eb7f0ed726a5179a32 ]
> >
> > Turns out that this patch requires several dependencies so the autoselection of this
> > patch was missing that.
> >
> > Can we either revert this patch or add the dependencies?
> >
> > Christian
>
> It seems that adding
>
> commit 6d212db11947ae5464e4717536ed9faf61c01e86 ("mm: add mm_pxd_folded checks to pgtable_bytes accounting functions")
> fixes the issue.

I've queued 6d212db11947 for 4.19 for now, thank you.

--
Thanks,
Sasha