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Message-ID: <591b5253-47f0-440c-84b6-7786ff59667d@sirena.org.uk>
Date: Tue, 11 Jul 2023 18:57:33 +0100
From: Mark Brown <broonie@...nel.org>
To: Hugh Dickins <hughd@...gle.com>
Cc: Lorenzo Stoakes <lstoakes@...il.com>,
Andrew Morton <akpm@...ux-foundation.org>,
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Subject: Re: [PATCH v2 12/32] mm/vmalloc: vmalloc_to_page() use
pte_offset_kernel()
On Tue, Jul 11, 2023 at 09:13:18AM -0700, Hugh Dickins wrote:
> On Tue, 11 Jul 2023, Mark Brown wrote:
> > On Mon, Jul 10, 2023 at 09:34:42PM -0700, Hugh Dickins wrote:
> >
> > > I suppose I should ask you to try reverting this 0d1c81edc61e alone
> > > from 6.5-rc1: the consistency of your bisection implies that it will
> > > "fix" the issues, and it is a commit which we could drop. It makes
> > > me a little nervous, applying userspace-pagetable validation to kernel
> > > pagetables, so I don't want to drop it; and it would really be cargo-
> > > culting to drop it without understanding. But we could drop it.
> >
> > I did look at that, it doesn't revert cleanly by itself. ...
>
> Right, that ptep_get() wrapper on the next line came in on top.
> The patch to revert just 0d1c81edc61e is this:
Still investigating but I'm pretty convinced this is nothing to do with
your commit/series and is just common or garden memory corruption that
just happens to get tickled by your changes. Sorry for the noise.
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