From: Mark Rutland <mark.rutland@arm.com>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>,
linux-mm@kvack.org, punit.agrawal@arm.com,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: Bad page state splats on arm64, v4.11-rc{3,4}
Date: Mon, 3 Apr 2017 16:51:52 +0100 [thread overview]
Message-ID: <20170403155152.GG18905@leverpostej> (raw)
In-Reply-To: <20170403154815.GE25550@e104818-lin.cambridge.arm.com>
On Mon, Apr 03, 2017 at 04:48:15PM +0100, Catalin Marinas wrote:
> On Mon, Apr 03, 2017 at 12:37:51PM +0100, Will Deacon wrote:
> > On Mon, Apr 03, 2017 at 11:56:29AM +0100, Mark Rutland wrote:
> > > On Fri, Mar 31, 2017 at 06:58:45PM +0100, Mark Rutland wrote:
> > > > I'm seeing intermittent bad page state splats on arm64 with 4.11-rc3 and
> > > > v4.11-rc4.
> > > I wasn't able to trigger the issue over the weekend on a kernel with
> > > HUGETLBFS disabled. There are known issues with our handling of
> > > contiguous entries, and this might be an artefact of that.
> >
> > After chatting with Punit, it looks like this might be because the GUP
> > code doesn't handle huge ptes (which we create using the contiguous hint),
> > so follow_page_pte ends up with one of those and goes wrong. In particular,
> > the migration code will certainly do the wrong thing.
> >
> > I'll probably revert the contiguous support (again) if testing indicates
> > that it makes this issue disappear.
>
> It might be worth checking with Punit's patches as well:
>
> https://marc.info/?l=linux-arm-kernel&m=149089199018167&w=2
I'd given those patches a spin prior to testing v4.11-rc4 with HUGETLBFS
disabled.
I saw the issue even with those patches applied.
Thanks,
Mark.
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next prev parent reply other threads:[~2017-04-03 15:52 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-31 17:58 Mark Rutland
2017-04-03 10:56 ` Mark Rutland
2017-04-03 11:37 ` Will Deacon
2017-04-03 15:48 ` Catalin Marinas
2017-04-03 15:51 ` Mark Rutland [this message]
2017-04-03 17:43 ` Mark Rutland
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