linux-kernel - Re: 5.0-rc1 KVM inspired "BUG: Bad page state in process" spew

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Date:   Mon, 14 Jan 2019 18:42:16 +0100
From:   Mike Galbraith <efault@....de>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Adam Borowski <kilobyte@...band.pl>, kvm <kvm@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: 5.0-rc1 KVM inspired "BUG: Bad page state in process" spew

On Mon, 2019-01-14 at 07:46 -0800, Sean Christopherson wrote:
> On Sat, Jan 12, 2019 at 07:43:02AM +0100, Mike Galbraith wrote:
> > On Wed, 2019-01-09 at 11:26 -0800, Sean Christopherson wrote:
> > > 
> > > I'll try to bisect.
> > 
> > Good luck with that.  I gave it a go, but that apparently invalidated
> > the warrantee of my vm image :)
> 
> This is fixed in v5.0-rc2 by commit ba422731316d ("mm/mmu_notifier:
> mm/rmap.c: Fix a mmu_notifier range bug in try_to_unmap_one").

Good to hear.

> Nested VMs are great for bisecting KVM issues :)

I tried nesting dolls (to speed bisection.. hah!), but couldn't
reliable trigger the problem with my reproducer.  Even if it had,
nested VMs are pretty cool, but not the _least bit_ fast :)

	-Mike