Re: 4.19.5 and later has tons of false messages "BUG: non-zero pgtables_bytes on freeing mm: -16384"
From: Christian Borntraeger
Date: Thu Dec 27 2018 - 04:29:11 EST
On 27.12.2018 10:13, Christian Borntraeger wrote:
> 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?
It seems that adding
commit 6d212db11947ae5464e4717536ed9faf61c01e86 ("mm: add mm_pxd_folded checks to pgtable_bytes accounting functions")
fixes the issue.
Martin, do we need more?