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

On Wed, 27 May 2020 21:31:46 +0200 Salvatore Bonaccorso <carnil@debian.org> wrote: 
Source: linux
Version: 5.6.7-1
Control: submitter -1 debian@the-jedi.co.uk

Forwarding this report as bug in the BTS.

On Mon, May 25, 2020 at 09:03:43PM +0100, Simon John wrote:
> Sorry to email directly but I've tried reportbug but it doesn't seem to work
> with the kernel packages.

What exactly did not work?
I tried to report a bug in 5.5 kernel regarding HDMI audio not working after a while until you kill pulseaudio but reportbug did not create a valid report i guess as it never got created - i tried using the email template too. 

same problem when trying to report this bug.
Anyway, at least this bug has been created now, hopefully will get looked into. 


> The 5.6.0-1 kernel in Sid when used in conjunction with VFIO (PCI
> passthrough) guests in Qemu-KVM causes KVM to crash with no useful logs -
> the guest partially starts. Eventually the host slows down and needs to be
> powered off. Doesn't affect non-VFIO guests using spice/headless, only when
> passing through a PCIe graphics card or USB keyboard/mouse.
> > 5.6.0-2 that just landed makes this infinitely worse - as soon as you start 
> a VFIO guest the host hard crashes.
> > 5.3/5.4/5.5 kernels do not have this problem with the same version of Qemu 
> and reverting from qemu 5.0 to 4.2 doesn't help, so it must be the 5.6
> kernel causing the issue.
> > Not sure what logs or any useful information I can supply you, there's some 
> interesting comments on this reddit thread suggesting a couple of bugs that
> have fixes upstream:
> > https://www.reddit.com/r/VFIO/comments/glfgqs/qemu_5_vfio_no_longer_works_on_debian/ > > I'm using macos catalina and win10 guests to reproduce the issue, and using 
> Intel not AMD chips.
> > Cheers. > > -- > Simon John 

Regards,
Salvatore




Best regards.

--
Simon John
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