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

From: Linus Torvalds
Date: Mon Apr 16 2018 - 13:56:25 EST


On Mon, Apr 16, 2018 at 10:43 AM, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> 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