System hangs when using VirtualBox with VMgfx emulation and 3D pass-through

[Michael Thayer]

Hello,

Posting this here in the hope of getting the attention of someone who
could help me debug it.  When I try to start a VirtualBox virtual
machine with VMgfx emulation and 3D pass-through enabled on my Ubuntu
18.10 system I quickly get a system hang with OOM killer messages in the
system log.  Killed processes have included the VM process and Xwayland,
but in both cases the memory usage reported in the log did not look
critical.  Reproducible with a pure X session and GNOME Shell/Wayland
(noting that VirtualBox is using the X protocol).  The system is a
Thinkpad T470 with HD Graphics 620.  Some of the stack traces in the log
have i915_gem functions in them.

If anyone has time and knowledge to help me with debugging or to give me
some pointers I would greatly appreciate it of course.  On-list or
off-list, though not sure if everyone reading the list is interested in
following this.

Regards
Michael
-- 
Michael Thayer | VirtualBox engineer
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