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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

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Hi,

sorry for the late reply, took me a while to first built the kernel with 
that options and then actually find time to play long enough.

If I did everything correctly, then I build 7.0.7 with
- CONFIG_VMAP_STACK=y
- CONFIG_KASAN=y

I did not get it to crash on that built kernel yet,
however I booted 7.0.9+deb14-amd64 once, and after playing a while got a 
crash again.

I will try using the built kernel next week to see if I can get it to 
crash as well.

Or do I have to look somewhere else if kasan is active?


On 18.05.26 15:43, Sean Christopherson wrote:
> Odds are very good this is due to host memory corruption, and is not a bug in
> KVM's MMU.  We (Google) had a period of time where our kernel was triggering stack
> overflows if a networking IRQ hit at just the right/wrong time, and whenever the
> overflow wandered into KVM page tables, it would result in failures like these.
> I got quite familiar with the signature :-)
Not sure if it could be something else, however I at least run memtest 
for ~12h without problems.
> If you aren't already, can you try running with CONFIG_VMAP_STACK=y?  Stack
> overflow doesn't seem likely in this case since the gfn would put the SPTE in the
> middle of the page table, but it's easy enough to rule out.
>
> The other thing to try would be to run with CONFIG_KASAN=y.  That might make your
> gaming quite miserable, but if this is indeed due to a rogue write, it's the best
> shot for catching the culprit.


Regards

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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> - 2026-05-17 15:30 +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 Sean Christopherson <seanjc@google.com> - 2026-05-18 15:50 +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 Maximilian Senftleben <kernel@0in.de> - 2026-06-03 16:00 +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 Sean Christopherson <seanjc@google.com> - 2026-06-05 23:50 +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 Maximilian Senftleben <kernel@0in.de> - 2026-06-24 22:10 +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 Sean Christopherson <seanjc@google.com> - 2026-06-25 18:20 +0200

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