Bug#1135235: linux-image-6.19.13+deb14-amd64: Reoccuring host crash "Invalid SPTE change" with gaming win kvm/qemu guest and device passthrough

From	Salvatore Bonaccorso <carnil@debian.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1135235: linux-image-6.19.13+deb14-amd64: Reoccuring host crash "Invalid SPTE change" with gaming win kvm/qemu guest and device passthrough
Date	2026-05-17 15:10 +0200
Message-ID	<MVJpL-5PaO-19@gated-at.bofh.it> (permalink)
References	<MPiBX-1lGE-1@gated-at.bofh.it> <MRsGR-2PIc-19@gated-at.bofh.it> <MVJpL-5PaO-21@gated-at.bofh.it> <MPiBX-1lGE-1@gated-at.bofh.it> <MVJpL-5PaO-21@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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Hi Maximilian,

[I noticed your reply did not went to the bugreport so I'm including
again for this reply the bug address]

On Mon, May 11, 2026 at 09:20:12PM +0200, Maximilian Senftleben wrote:
> 
> On 05.05.26 20:22, Salvatore Bonaccorso wrote:
> >  From the log we see that the looking-glass application. AFAICS you do
> > not use the related dkms module? (that would taint the kernel).
> I am not perfectly sure, I use the LG client, and I do not recall manually
> calling dkms install
> However, if I run "dkms status" I get
> > # dkms status
> > kvmfr/0.0.12, 6.16-amd64, x86_64: installed
> > kvmfr/0.0.12, 6.16-rc7-amd64, x86_64: installed
> > kvmfr/0.0.12, 6.19.13+deb14-amd64, x86_64: installed
> > kvmfr/0.0.12, 6.19.14+deb14-amd64, x86_64: installed
> > kvmfr/0.0.12, 7.0.4+deb14-amd64, x86_64: installed
> 
> On the other hand, there is no kvmfr related message in dmesg,
> nor a /dev/kvmfr0 device...
> And my qemu config does not have the required config as well.

Right if the module would have been loaded then there should have been
a tained kernel. 

But it is still odd as the issues in the trace you posted happens
around the looking-glass application. I will ask upstream if they have
some input on how to debug that.

Regards,
Salvatore

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Bug#1135235: linux-image-6.19.13+deb14-amd64: Reoccuring host crash "Invalid SPTE change" with gaming win kvm/qemu guest and device passthrough Salvatore Bonaccorso <carnil@debian.org> - 2026-05-05 20:30 +0200
  Processed: Re: Bug#1135235: linux-image-6.19.13+deb14-amd64:  Reoccuring host crash "Invalid SPTE change" with gaming win kvm/qemu guest  and device passthrough "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-05-05 20:30 +0200
  Bug#1135235: linux-image-6.19.13+deb14-amd64: Reoccuring host crash "Invalid SPTE change" with gaming win kvm/qemu guest and device passthrough Salvatore Bonaccorso <carnil@debian.org> - 2026-05-17 15:10 +0200

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