linux-kernel - Re: BSOD with [PATCH 00/13] mmu_notifier kill invalidate

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Message-ID: <20171130161933.GB1606@flask>
Date:   Thu, 30 Nov 2017 17:19:34 +0100
From:   Radim Krčmář <rkrcmar@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Jérôme Glisse <jglisse@...hat.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Joerg Roedel <jroedel@...e.de>,
        Dan Williams <dan.j.williams@...el.com>,
        Sudeep Dutt <sudeep.dutt@...el.com>,
        Ashutosh Dixit <ashutosh.dixit@...el.com>,
        Dimitri Sivanich <sivanich@....com>,
        Jack Steiner <steiner@....com>, linuxppc-dev@...ts.ozlabs.org,
        iommu@...ts.linux-foundation.org, xen-devel@...ts.xenproject.org,
        kvm@...r.kernel.org
Subject: Re: BSOD with [PATCH 00/13] mmu_notifier kill invalidate_page
 callback

2017-11-30 12:20+0100, Paolo Bonzini:
> On 30/11/2017 10:33, Fabian Grünbichler wrote:
> > 
> > It was reverted in 785373b4c38719f4af6775845df6be1dfaea120f after which
> > the symptoms disappeared until this series was merged, which contains
> > 
> > 369ea8242c0fb5239b4ddf0dc568f694bd244de4 mm/rmap: update to new mmu_notifier semantic v2
> > 
> > We haven't bisected the individual commits of the series yet, but the
> > commit immediately preceding its merge exhibits no problems, while
> > everything after does. It is not known whether the bug is actually in
> > the series itself, or whether increasing the likelihood of triggering it
> > is just a side-effect. There is a similar report[2] concerning an
> > upgrade from 4.12.12 to 4.12.13, which does not contain this series in
> > any form AFAICT but might be worth another look as well.
> 
> I know of one issue in this series (invalidate_page was removed from KVM
> without reimplementing it as invalidate_range).  I'll try to prioritize
> the fix, but I don't think I can do it before Monday.

The series also dropped the reloading of the APIC access page and we
never had it in invalidate_range_start ... I'll look into it today.