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Subject: Re: Linux 4.17-rc1 - kernel paging errors running x86 selftests
To:     Linus Torvalds <torvalds@linux-foundation.org>,
        Shuah Khan <shuahkh@osg.samsung.com>
References: <1dcd116c-9384-6885-2d9e-f620c14bd955@osg.samsung.com>
 <CA+55aFwE1SR87+Xkkmfr+D0Yq3R0HRkdf1GdgScEfXXWN4ba6w@mail.gmail.com>
 <CA+55aFzotCBw7S=dNzyFjZkNqS7MMeKVgUoK6Dgb9gRPV_ywVQ@mail.gmail.com>
Cc:     Andy Lutomirski <luto@kernel.org>, Ingo Molnar <mingo@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        the arch/x86 maintainers <x86@kernel.org>
From:   Dave Hansen <dave.hansen@linux.intel.com>
Message-ID: <8c0a94b7-763d-16be-6401-23a3064ee55a@linux.intel.com>
Date:   Mon, 16 Apr 2018 10:58:58 -0700
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On 04/16/2018 10:56 AM, Linus Torvalds wrote:
> On Mon, Apr 16, 2018 at 10:43 AM, Linus Torvalds
> <torvalds@linux-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.

Joerg just found and fixed something that would be poked by the x86
selftests:

https://lkml.org/lkml/2018/4/16/230