Bug#961676: 5.6 kernel crashes host when using VFIO on KVM guests

To: 961676@bugs.debian.org
Subject: Bug#961676: 5.6 kernel crashes host when using VFIO on KVM guests
From: Simon John <debian@the-jedi.co.uk>
Date: Sun, 19 Jul 2020 00:34:02 +0100
Message-id: <[🔎] aae2804e-eeb7-b3b4-695d-383eda42f35c@the-jedi.co.uk>
Reply-to: Simon John <debian@the-jedi.co.uk>, 961676@bugs.debian.org
In-reply-to: <[🔎] c47922d4-98d8-b8ae-0c31-c7864aeb7b67@the-jedi.co.uk>
References: <20200527193146.GA262873@eldamar.local> <83904c20-836a-42df-373b-c4ca99e84363@the-jedi.co.uk> <83904c20-836a-42df-373b-c4ca99e84363@the-jedi.co.uk> <68f0e7d9-f76a-abfc-0dc3-956cc6f309c3@the-jedi.co.uk> <68f0e7d9-f76a-abfc-0dc3-956cc6f309c3@the-jedi.co.uk> <86ccfdfa-e7a5-a329-9786-79d82e68c498@the-jedi.co.uk> <86ccfdfa-e7a5-a329-9786-79d82e68c498@the-jedi.co.uk> <e7ceeebd-f787-0b93-3be1-01d63038b33d@the-jedi.co.uk> <20200527193146.GA262873@eldamar.local> <97952b5a-8b75-2c30-e536-457548a49eeb@the-jedi.co.uk> <20200628084141.GA73190@eldamar.local> <20200628084141.GA73190@eldamar.local> <384c34c7-a05d-2b6b-c5f9-cbd0105d5b8b@the-jedi.co.uk> <384c34c7-a05d-2b6b-c5f9-cbd0105d5b8b@the-jedi.co.uk> <[🔎] a1542cba-9d81-297a-d2ef-cd90740bb7d1@the-jedi.co.uk> <[🔎] a1542cba-9d81-297a-d2ef-cd90740bb7d1@the-jedi.co.uk> <[🔎] c47922d4-98d8-b8ae-0c31-c7864aeb7b67@the-jedi.co.uk> <20200527193146.GA262873@eldamar.local>

I tried mainline 5.8.0-rc5 and I couldn't even get into gnome shellafter the gdm3 password prompt, just a black screen!

I tried running virsh start which worked but my monitor never got asignal. It also didn't crash the host or qemu though, although virshdestroy finished instantly, so i assume the guest didn't even start.


regards.

--
Simon John

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Follow-Ups:
- Bug#961676: 5.6 kernel crashes host when using VFIO on KVM guests
  - From: Simon John <debian@the-jedi.co.uk>

References:
- Bug#961676: 5.6 kernel crashes host when using VFIO on KVM guests
  - From: Simon John <debian@the-jedi.co.uk>
- Bug#961676: 5.6 kernel crashes host when using VFIO on KVM guests
  - From: Simon John <debian@the-jedi.co.uk>

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