linux-kernel - Re: Linux 4.17-rc1 - kernel paging errors running x86 selftests

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Message-ID: <CA+55aFzotCBw7S=dNzyFjZkNqS7MMeKVgUoK6Dgb9gRPV_ywVQ@mail.gmail.com>
Date:   Mon, 16 Apr 2018 10:56:19 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Shuah Khan <shuahkh@....samsung.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     Andy Lutomirski <luto@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: Linux 4.17-rc1 - kernel paging errors running x86 selftests

On Mon, Apr 16, 2018 at 10:43 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> I don't see *why* it would be badly set up, and that test works fine
> for me, though.

AHHAH!

I'm wrong. I can see it too. My desktop was running 18b7fd1c93e5 (my
kernel from Saturday, I hadn't rebooted it since), but I had 4.17-rc1
in kvmtool and on my laptop, and I see the problem in both cases.

So this came in recently, and I bet it's the global pages series from
Dave Hansen, although there were a few other things that came in
during the last day.

That should make it easy to bisect, there's only a handful of x86 changes.

                Linus