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

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Message-ID: <8c0a94b7-763d-16be-6401-23a3064ee55a@linux.intel.com>
Date:   Mon, 16 Apr 2018 10:58:58 -0700
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Shuah Khan <shuahkh@....samsung.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 04/16/2018 10:56 AM, Linus Torvalds wrote:
> 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.

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

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