Bug#1014394: Also Affected - linux kernel 5.10.0-15 on virtualbox host causes random process crashes in guests

[Richard Laysell <mldebian@xiphosura.co.uk>]

Hello,

I am also affected by this same bug.

I run Firefox in a virtual machine and if I am running the
5.10.0-15-amd64 kernel on the virtual host, then Firefox crashes
regularly in the virtual guest.

However, if I run the 5.10.0-14-amd64 kernel on the virtual host, then
I see no crashes.

In both cases the virtual guest is running the 5.10.0-15-amd64 kernel

This is on Debian Bullseye

VirtualBox packages are from Fasttrack
virtualbox       6.1.34-dfsg-3~fto11+1            amd64
virtualbox-dkms  6.1.34-dfsg-3~fto11+1            amd64
virtualbox-qt    6.1.34-dfsg-3~fto11+1            amd64

Kernels are the standard Debian kernels from stable (both host and
guest)
linux-image-5.10.0-14-amd64      5.10.113-1       amd64
linux-image-5.10.0-15-amd64      5.10.120-1       amd64

I have seen this issue on two separate systems, so I do not think it is
hardware related.

Happy to do any testing or provide any logs you can suggest.

Regards,

Richard